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Rollup merge of #72543 - estebank:opaque-missing-lts-in-fn, r=nikomatsakis

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Account for missing lifetime in opaque and trait object return types

When encountering an opaque closure return type that needs to bound a
lifetime to the function's arguments, including borrows and type params,
provide appropriate suggestions that lead to working code.

Get the user from

```rust
fn foo<G, T>(g: G, dest: &mut T) -> impl FnOnce()
where
    G: Get<T>
{
    move || {
        *dest = g.get();
    }
}
```

to

```rust
fn foo<'a, G: 'a, T>(g: G, dest: &'a mut T) -> impl FnOnce() +'a
where
    G: Get<T>
{
    move || {
        *dest = g.get();
    }
}
```
This commit is contained in:
Ralf Jung 2020-05-30 23:08:42 +02:00 committed by GitHub
parent 74e8046834 83f6f22358
commit f1661d23e3
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GPG key ID: 4AEE18F83AFDEB23
51 changed files with 834 additions and 654 deletions
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170
src/librustc_infer/infer/error_reporting/mod.rs
View file

@ -60,7 +60,7 @@
use rustc_errors::{Applicability, DiagnosticBuilder, DiagnosticStyledString};
use rustc_hir as hir;
use rustc_hir::def_id::DefId;
use rustc_hir::Node;
use rustc_hir::{Item, ItemKind, Node};
use rustc_middle::ty::error::TypeError;
use rustc_middle::ty::{
self,
@ -1682,49 +1682,92 @@ pub fn construct_generic_bound_failure(
bound_kind: GenericKind<'tcx>,
sub: Region<'tcx>,
) -> DiagnosticBuilder<'a> {
let hir = &self.tcx.hir();
// Attempt to obtain the span of the parameter so we can
// suggest adding an explicit lifetime bound to it.
let type_param_span = match (self.in_progress_tables, bound_kind) {
(Some(ref table), GenericKind::Param(ref param)) => {
let table_owner = table.borrow().hir_owner;
table_owner.and_then(|table_owner| {
let generics = self.tcx.generics_of(table_owner.to_def_id());
// Account for the case where `param` corresponds to `Self`,
// which doesn't have the expected type argument.
if !(generics.has_self && param.index == 0) {
let type_param = generics.type_param(param, self.tcx);
let hir = &self.tcx.hir();
type_param.def_id.as_local().map(|def_id| {
// Get the `hir::Param` to verify whether it already has any bounds.
// We do this to avoid suggesting code that ends up as `T: 'a'b`,
// instead we suggest `T: 'a + 'b` in that case.
let id = hir.as_local_hir_id(def_id);
let mut has_bounds = false;
if let Node::GenericParam(param) = hir.get(id) {
has_bounds = !param.bounds.is_empty();
}
let sp = hir.span(id);
// `sp` only covers `T`, change it so that it covers
// `T:` when appropriate
let is_impl_trait = bound_kind.to_string().starts_with("impl ");
let sp = if has_bounds && !is_impl_trait {
sp.to(self
.tcx
.sess
.source_map()
.next_point(self.tcx.sess.source_map().next_point(sp)))
} else {
sp
};
(sp, has_bounds, is_impl_trait)
})
let generics =
self.in_progress_tables.and_then(|table| table.borrow().hir_owner).map(|table_owner| {
let hir_id = hir.as_local_hir_id(table_owner);
let parent_id = hir.get_parent_item(hir_id);
(
// Parent item could be a `mod`, so we check the HIR before calling:
if let Some(Node::Item(Item {
kind: ItemKind::Trait(..) | ItemKind::Impl { .. },
..
})) = hir.find(parent_id)
{
Some(self.tcx.generics_of(hir.local_def_id(parent_id).to_def_id()))
} else {
None
}
})
},
self.tcx.generics_of(table_owner.to_def_id()),
)
});
let type_param_span = match (generics, bound_kind) {
(Some((_, ref generics)), GenericKind::Param(ref param)) => {
// Account for the case where `param` corresponds to `Self`,
// which doesn't have the expected type argument.
if !(generics.has_self && param.index == 0) {
let type_param = generics.type_param(param, self.tcx);
type_param.def_id.as_local().map(|def_id| {
// Get the `hir::Param` to verify whether it already has any bounds.
// We do this to avoid suggesting code that ends up as `T: 'a'b`,
// instead we suggest `T: 'a + 'b` in that case.
let id = hir.as_local_hir_id(def_id);
let mut has_bounds = false;
if let Node::GenericParam(param) = hir.get(id) {
has_bounds = !param.bounds.is_empty();
}
let sp = hir.span(id);
// `sp` only covers `T`, change it so that it covers
// `T:` when appropriate
let is_impl_trait = bound_kind.to_string().starts_with("impl ");
let sp = if has_bounds && !is_impl_trait {
sp.to(self
.tcx
.sess
.source_map()
.next_point(self.tcx.sess.source_map().next_point(sp)))
} else {
sp
};
(sp, has_bounds, is_impl_trait)
})
} else {
None
}
}
_ => None,
};
let new_lt = generics
.as_ref()
.and_then(|(parent_g, g)| {
let possible: Vec<_> = (b'a'..=b'z').map(|c| format!("'{}", c as char)).collect();
let mut lts_names = g
.params
.iter()
.filter(|p| matches!(p.kind, ty::GenericParamDefKind::Lifetime))
.map(|p| p.name.as_str())
.collect::<Vec<_>>();
if let Some(g) = parent_g {
lts_names.extend(
g.params
.iter()
.filter(|p| matches!(p.kind, ty::GenericParamDefKind::Lifetime))
.map(|p| p.name.as_str()),
);
}
let lts = lts_names.iter().map(|s| -> &str { &*s }).collect::<Vec<_>>();
possible.into_iter().find(|candidate| !lts.contains(&candidate.as_str()))
})
.unwrap_or("'lt".to_string());
let add_lt_sugg = generics
.as_ref()
.and_then(|(_, g)| g.params.first())
.and_then(|param| param.def_id.as_local())
.map(|def_id| {
(hir.span(hir.as_local_hir_id(def_id)).shrink_to_lo(), format!("{}, ", new_lt))
});
let labeled_user_string = match bound_kind {
GenericKind::Param(ref p) => format!("the parameter type `{}`", p),
@ -1781,6 +1824,29 @@ fn binding_suggestion<'tcx, S: fmt::Display>(
}
}
let new_binding_suggestion =
|err: &mut DiagnosticBuilder<'tcx>,
type_param_span: Option<(Span, bool, bool)>,
bound_kind: GenericKind<'tcx>| {
let msg = "consider introducing an explicit lifetime bound";
if let Some((sp, has_lifetimes, is_impl_trait)) = type_param_span {
let suggestion = if is_impl_trait {
(sp.shrink_to_hi(), format!(" + {}", new_lt))
} else {
let tail = if has_lifetimes { " +" } else { "" };
(sp, format!("{}: {}{}", bound_kind, new_lt, tail))
};
let mut sugg =
vec![suggestion, (span.shrink_to_hi(), format!(" + {}", new_lt))];
if let Some(lt) = add_lt_sugg {
sugg.push(lt);
sugg.rotate_right(1);
}
// `MaybeIncorrect` due to issue #41966.
err.multipart_suggestion(msg, sugg, Applicability::MaybeIncorrect);
}
};
let mut err = match *sub {
ty::ReEarlyBound(ty::EarlyBoundRegion { name, .. })
| ty::ReFree(ty::FreeRegion { bound_region: ty::BrNamed(_, name), .. }) => {
@ -1822,10 +1888,6 @@ fn binding_suggestion<'tcx, S: fmt::Display>(
"{} may not live long enough",
labeled_user_string
);
err.help(&format!(
"consider adding an explicit lifetime bound for `{}`",
bound_kind
));
note_and_explain_region(
self.tcx,
&mut err,
@ -1833,6 +1895,21 @@ fn binding_suggestion<'tcx, S: fmt::Display>(
sub,
"...",
);
if let Some(infer::RelateParamBound(_, t)) = origin {
let t = self.resolve_vars_if_possible(&t);
match t.kind {
// We've got:
// fn get_later<G, T>(g: G, dest: &mut T) -> impl FnOnce() + '_
// suggest:
// fn get_later<'a, G: 'a, T>(g: G, dest: &mut T) -> impl FnOnce() + '_ + 'a
ty::Closure(_, _substs) | ty::Opaque(_, _substs) => {
new_binding_suggestion(&mut err, type_param_span, bound_kind);
}
_ => {
binding_suggestion(&mut err, type_param_span, bound_kind, new_lt);
}
}
}
err
}
};
@ -1861,14 +1938,15 @@ fn report_sub_sup_conflict(
"...",
);
debug!("report_sub_sup_conflict: var_origin={:?}", var_origin);
debug!("report_sub_sup_conflict: sub_region={:?}", sub_region);
debug!("report_sub_sup_conflict: sub_origin={:?}", sub_origin);
debug!("report_sub_sup_conflict: sup_region={:?}", sup_region);
debug!("report_sub_sup_conflict: sup_origin={:?}", sup_origin);
if let (&infer::Subtype(ref sup_trace), &infer::Subtype(ref sub_trace)) =
(&sup_origin, &sub_origin)
{
debug!("report_sub_sup_conflict: var_origin={:?}", var_origin);
debug!("report_sub_sup_conflict: sub_region={:?}", sub_region);
debug!("report_sub_sup_conflict: sub_origin={:?}", sub_origin);
debug!("report_sub_sup_conflict: sup_region={:?}", sup_region);
debug!("report_sub_sup_conflict: sup_origin={:?}", sup_origin);
debug!("report_sub_sup_conflict: sup_trace={:?}", sup_trace);
debug!("report_sub_sup_conflict: sub_trace={:?}", sub_trace);
debug!("report_sub_sup_conflict: sup_trace.values={:?}", sup_trace.values);

6
src/librustc_infer/infer/error_reporting/nice_region_error/different_lifetimes.rs
View file

@ -121,16 +121,14 @@ pub(super) fn try_report_anon_anon_conflict(&self) -> Option<ErrorReported> {
(Some(ret_span), _) => (
ty_sub.span,
ret_span,
"this parameter and the return type are declared \
with different lifetimes..."
"this parameter and the return type are declared with different lifetimes..."
.to_owned(),
format!("...but data{} is returned here", span_label_var1),
),
(_, Some(ret_span)) => (
ty_sup.span,
ret_span,
"this parameter and the return type are declared \
with different lifetimes..."
"this parameter and the return type are declared with different lifetimes..."
.to_owned(),
format!("...but data{} is returned here", span_label_var1),
),

2
src/librustc_infer/infer/error_reporting/nice_region_error/mod.rs
View file

@ -55,9 +55,9 @@ pub fn try_report(&self) -> Option<ErrorReported> {
diag.emit();
ErrorReported
})
.or_else(|| self.try_report_impl_not_conforming_to_trait())
.or_else(|| self.try_report_anon_anon_conflict())
.or_else(|| self.try_report_static_impl_trait())
.or_else(|| self.try_report_impl_not_conforming_to_trait())
}
pub fn regions(&self) -> Option<(Span, ty::Region<'tcx>, ty::Region<'tcx>)> {

37
src/librustc_infer/infer/error_reporting/nice_region_error/named_anon_conflict.rs
View file

@ -21,8 +21,8 @@ pub(super) fn try_report_named_anon_conflict(&self) -> Option<DiagnosticBuilder<
// where the anonymous region appears (there must always be one; we
// only introduced anonymous regions in parameters) as well as a
// version new_ty of its type where the anonymous region is replaced
// with the named one.//scope_def_id
let (named, anon, anon_param_info, region_info) = if self.is_named_region(sub)
// with the named one.
let (named, anon, anon_param_info, region_info) = if sub.has_name()
&& self.tcx().is_suitable_region(sup).is_some()
&& self.find_param_with_region(sup, sub).is_some()
{
@ -32,7 +32,7 @@ pub(super) fn try_report_named_anon_conflict(&self) -> Option<DiagnosticBuilder<
self.find_param_with_region(sup, sub).unwrap(),
self.tcx().is_suitable_region(sup).unwrap(),
)
} else if self.is_named_region(sup)
} else if sup.has_name()
&& self.tcx().is_suitable_region(sub).is_some()
&& self.find_param_with_region(sub, sup).is_some()
{
@ -74,15 +74,21 @@ pub(super) fn try_report_named_anon_conflict(&self) -> Option<DiagnosticBuilder<
}
if let Some((_, fndecl)) = self.find_anon_type(anon, &br) {
if self.is_return_type_anon(scope_def_id, br, fndecl).is_some()
|| self.is_self_anon(is_first, scope_def_id)
{
let is_self_anon = self.is_self_anon(is_first, scope_def_id);
if is_self_anon {
return None;
}
if let FnRetTy::Return(ty) = &fndecl.output {
if let (TyKind::Def(_, _), ty::ReStatic) = (&ty.kind, sub) {
// This is an impl Trait return that evaluates de need of 'static.
// We handle this case better in `static_impl_trait`.
let mut v = ty::TraitObjectVisitor(vec![]);
rustc_hir::intravisit::walk_ty(&mut v, ty);
debug!("try_report_named_anon_conflict: ret ty {:?}", ty);
if sub == &ty::ReStatic && (matches!(ty.kind, TyKind::Def(_, _)) || v.0.len() == 1)
{
debug!("try_report_named_anon_conflict: impl Trait + 'static");
// This is an `impl Trait` or `dyn Trait` return that evaluates de need of
// `'static`. We handle this case better in `static_impl_trait`.
return None;
}
}
@ -114,17 +120,4 @@ pub(super) fn try_report_named_anon_conflict(&self) -> Option<DiagnosticBuilder<
Some(diag)
}
// This method returns whether the given Region is Named
pub(super) fn is_named_region(&self, region: ty::Region<'tcx>) -> bool {
match *region {
ty::ReStatic => true,
ty::ReFree(ref free_region) => match free_region.bound_region {
ty::BrNamed(..) => true,
_ => false,
},
ty::ReEarlyBound(ebr) => ebr.has_name(),
_ => false,
}
}
}

83
src/librustc_infer/infer/error_reporting/nice_region_error/static_impl_trait.rs
View file

@ -4,7 +4,7 @@
use crate::infer::error_reporting::nice_region_error::NiceRegionError;
use crate::infer::lexical_region_resolve::RegionResolutionError;
use rustc_errors::{Applicability, ErrorReported};
use rustc_middle::ty::{BoundRegion, FreeRegion, RegionKind};
use rustc_middle::ty::RegionKind;
impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
/// Print the error message for lifetime errors when the return type is a static impl Trait.
@ -20,48 +20,59 @@ pub(super) fn try_report_static_impl_trait(&self) -> Option<ErrorReported> {
) = error.clone()
{
let anon_reg_sup = self.tcx().is_suitable_region(sup_r)?;
let return_ty = self.tcx().return_type_impl_trait(anon_reg_sup.def_id);
if sub_r == &RegionKind::ReStatic && return_ty.is_some() {
let (fn_return_span, is_dyn) =
self.tcx().return_type_impl_or_dyn_trait(anon_reg_sup.def_id)?;
if sub_r == &RegionKind::ReStatic {
let sp = var_origin.span();
let return_sp = sub_origin.span();
let mut err =
self.tcx().sess.struct_span_err(sp, "cannot infer an appropriate lifetime");
err.span_label(
return_sp,
"this return type evaluates to the `'static` lifetime...",
);
err.span_label(sup_origin.span(), "...but this borrow...");
let param_info = self.find_param_with_region(sup_r, sub_r)?;
err.span_label(param_info.param_ty_span, "data with this lifetime...");
let (lifetime, lt_sp_opt) = msg_span_from_free_region(self.tcx(), sup_r);
if let Some(lifetime_sp) = lt_sp_opt {
err.span_note(lifetime_sp, &format!("...can't outlive {}", lifetime));
// We try to make the output have fewer overlapping spans if possible.
if (sp == sup_origin.span() || !return_sp.overlaps(sup_origin.span()))
&& sup_origin.span() != return_sp
{
// FIXME: account for `async fn` like in `async-await/issues/issue-62097.rs`
// Customize the spans and labels depending on their relative order so
// that split sentences flow correctly.
if sup_origin.span().shrink_to_hi() <= return_sp.shrink_to_lo() {
err.span_label(sup_origin.span(), "...is captured here...");
err.span_label(return_sp, "...and required to be `'static` by this");
} else {
err.span_label(return_sp, "...is required to be `'static` by this...");
err.span_label(sup_origin.span(), "...and is captured here");
}
} else {
err.span_label(
return_sp,
"...is captured and required to be `'static` here",
);
}
let lifetime_name = match sup_r {
RegionKind::ReFree(FreeRegion {
bound_region: BoundRegion::BrNamed(_, ref name),
..
}) => name.to_string(),
_ => "'_".to_owned(),
};
let fn_return_span = return_ty.unwrap().1;
if let Ok(snippet) =
self.tcx().sess.source_map().span_to_snippet(fn_return_span)
{
// only apply this suggestion onto functions with
// explicit non-desugar'able return.
if fn_return_span.desugaring_kind().is_none() {
err.span_suggestion(
fn_return_span,
&format!(
"you can add a bound to the return type to make it last \
less than `'static` and match {}",
lifetime,
),
format!("{} + {}", snippet, lifetime_name),
Applicability::Unspecified,
);
}
let (lifetime, _) = msg_span_from_free_region(self.tcx(), sup_r);
let lifetime_name =
if sup_r.has_name() { sup_r.to_string() } else { "'_".to_owned() };
// only apply this suggestion onto functions with
// explicit non-desugar'able return.
if fn_return_span.desugaring_kind().is_none() {
let msg = format!(
"to permit non-static references in {} `{} Trait` value, you can add \
an explicit bound for {}",
if is_dyn { "a" } else { "an" },
if is_dyn { "dyn" } else { "impl" },
lifetime,
);
// FIXME: account for the need of parens in `&(dyn Trait + '_)`
err.span_suggestion_verbose(
fn_return_span.shrink_to_hi(),
&msg,
format!(" + {}", lifetime_name),
Applicability::MaybeIncorrect,
);
}
err.emit();
return Some(ErrorReported);

59
src/librustc_infer/infer/error_reporting/note.rs
View file

@ -10,10 +10,22 @@ pub(super) fn note_region_origin(
err: &mut DiagnosticBuilder<'_>,
origin: &SubregionOrigin<'tcx>,
) {
let mut label_or_note = |span, msg| {
let sub_count = err.children.iter().filter(|d| d.span.is_dummy()).count();
let expanded_sub_count = err.children.iter().filter(|d| !d.span.is_dummy()).count();
let span_is_primary = err.span.primary_spans().iter().all(|&sp| sp == span);
if span_is_primary && sub_count == 0 && expanded_sub_count == 0 {
err.span_label(span, msg);
} else if span_is_primary && expanded_sub_count == 0 {
err.note(msg);
} else {
err.span_note(span, msg);
}
};
match *origin {
infer::Subtype(ref trace) => {
if let Some((expected, found)) = self.values_str(&trace.values) {
err.span_note(
label_or_note(
trace.cause.span,
&format!("...so that the {}", trace.cause.as_requirement_str()),
);
@ -24,27 +36,27 @@ pub(super) fn note_region_origin(
// handling of region checking when type errors are present is
// *terrible*.
err.span_note(
label_or_note(
trace.cause.span,
&format!("...so that {}", trace.cause.as_requirement_str()),
);
}
}
infer::Reborrow(span) => {
err.span_note(span, "...so that reference does not outlive borrowed content");
label_or_note(span, "...so that reference does not outlive borrowed content");
}
infer::ReborrowUpvar(span, ref upvar_id) => {
let var_name = self.tcx.hir().name(upvar_id.var_path.hir_id);
err.span_note(span, &format!("...so that closure can access `{}`", var_name));
label_or_note(span, &format!("...so that closure can access `{}`", var_name));
}
infer::RelateObjectBound(span) => {
err.span_note(span, "...so that it can be closed over into an object");
label_or_note(span, "...so that it can be closed over into an object");
}
infer::CallReturn(span) => {
err.span_note(span, "...so that return value is valid for the call");
label_or_note(span, "...so that return value is valid for the call");
}
infer::DataBorrowed(ty, span) => {
err.span_note(
label_or_note(
span,
&format!(
"...so that the type `{}` is not borrowed for too long",
@ -53,36 +65,33 @@ pub(super) fn note_region_origin(
);
}
infer::ReferenceOutlivesReferent(ty, span) => {
err.span_note(
label_or_note(
span,
&format!(
"...so that the reference type `{}` does not outlive the \
data it points at",
"...so that the reference type `{}` does not outlive the data it points at",
self.ty_to_string(ty)
),
);
}
infer::RelateParamBound(span, t) => {
err.span_note(
label_or_note(
span,
&format!(
"...so that the type `{}` will meet its required \
lifetime bounds",
"...so that the type `{}` will meet its required lifetime bounds",
self.ty_to_string(t)
),
);
}
infer::RelateRegionParamBound(span) => {
err.span_note(
label_or_note(
span,
"...so that the declared lifetime parameter bounds are satisfied",
);
}
infer::CompareImplMethodObligation { span, .. } => {
err.span_note(
label_or_note(
span,
"...so that the definition in impl matches the definition from the \
trait",
"...so that the definition in impl matches the definition from the trait",
);
}
}
@ -113,8 +122,7 @@ pub(super) fn report_concrete_failure(
self.tcx.sess,
span,
E0312,
"lifetime of reference outlives lifetime of \
borrowed content..."
"lifetime of reference outlives lifetime of borrowed content..."
);
note_and_explain_region(
self.tcx,
@ -138,8 +146,7 @@ pub(super) fn report_concrete_failure(
self.tcx.sess,
span,
E0313,
"lifetime of borrowed pointer outlives lifetime \
of captured variable `{}`...",
"lifetime of borrowed pointer outlives lifetime of captured variable `{}`...",
var_name
);
note_and_explain_region(
@ -163,8 +170,8 @@ pub(super) fn report_concrete_failure(
self.tcx.sess,
span,
E0476,
"lifetime of the source pointer does not outlive \
lifetime bound of the object type"
"lifetime of the source pointer does not outlive lifetime bound of the \
object type"
);
note_and_explain_region(self.tcx, &mut err, "object type is valid for ", sub, "");
note_and_explain_region(
@ -181,8 +188,7 @@ pub(super) fn report_concrete_failure(
self.tcx.sess,
span,
E0477,
"the type `{}` does not fulfill the required \
lifetime",
"the type `{}` does not fulfill the required lifetime",
self.ty_to_string(ty)
);
match *sub {
@ -217,8 +223,7 @@ pub(super) fn report_concrete_failure(
self.tcx.sess,
span,
E0482,
"lifetime of return value does not outlive the \
function call"
"lifetime of return value does not outlive the function call"
);
note_and_explain_region(
self.tcx,

101
src/librustc_middle/ty/context.rs
View file

@ -1,38 +1,27 @@
//! Type context book-keeping.
use crate::arena::Arena;
use crate::dep_graph::DepGraph;
use crate::dep_graph::{self, DepConstructor};
use crate::dep_graph::{self, DepConstructor, DepGraph};
use crate::hir::exports::Export;
use crate::ich::{NodeIdHashingMode, StableHashingContext};
use crate::infer::canonical::{Canonical, CanonicalVarInfo, CanonicalVarInfos};
use crate::lint::LintDiagnosticBuilder;
use crate::lint::{struct_lint_level, LintSource};
use crate::lint::{struct_lint_level, LintDiagnosticBuilder, LintSource};
use crate::middle;
use crate::middle::cstore::CrateStoreDyn;
use crate::middle::cstore::EncodedMetadata;
use crate::middle::cstore::{CrateStoreDyn, EncodedMetadata};
use crate::middle::resolve_lifetime::{self, ObjectLifetimeDefault};
use crate::middle::stability;
use crate::mir::interpret::{Allocation, ConstValue, Scalar};
use crate::mir::{interpret, Body, Field, Local, Place, PlaceElem, ProjectionKind, Promoted};
use crate::mir::interpret::{self, Allocation, ConstValue, Scalar};
use crate::mir::{Body, Field, Local, Place, PlaceElem, ProjectionKind, Promoted};
use crate::traits;
use crate::ty::query;
use crate::ty::steal::Steal;
use crate::ty::subst::{GenericArg, InternalSubsts, Subst, SubstsRef};
use crate::ty::subst::{GenericArgKind, UserSubsts};
use crate::ty::CanonicalPolyFnSig;
use crate::ty::GenericParamDefKind;
use crate::ty::RegionKind;
use crate::ty::ReprOptions;
use crate::ty::subst::{GenericArg, GenericArgKind, InternalSubsts, Subst, SubstsRef, UserSubsts};
use crate::ty::TyKind::*;
use crate::ty::{self, DefIdTree, Ty, TypeAndMut};
use crate::ty::{AdtDef, AdtKind, Const, Region};
use crate::ty::{BindingMode, BoundVar};
use crate::ty::{ConstVid, FloatVar, FloatVid, IntVar, IntVid, TyVar, TyVid};
use crate::ty::{ExistentialPredicate, Predicate, PredicateKind};
use crate::ty::{InferConst, ParamConst};
use crate::ty::{InferTy, ParamTy, PolyFnSig, ProjectionTy};
use crate::ty::{List, TyKind, TyS};
use crate::ty::{
self, query, AdtDef, AdtKind, BindingMode, BoundVar, CanonicalPolyFnSig, Const, ConstVid,
DefIdTree, ExistentialPredicate, FloatVar, FloatVid, GenericParamDefKind, InferConst, InferTy,
IntVar, IntVid, List, ParamConst, ParamTy, PolyFnSig, Predicate, PredicateKind, ProjectionTy,
Region, RegionKind, ReprOptions, TraitObjectVisitor, Ty, TyKind, TyS, TyVar, TyVid, TypeAndMut,
};
use rustc_ast::ast;
use rustc_ast::expand::allocator::AllocatorKind;
use rustc_attr as attr;
@ -48,10 +37,8 @@
use rustc_hir::def::{DefKind, Res};
use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, DefIdSet, LocalDefId, LOCAL_CRATE};
use rustc_hir::definitions::{DefPathHash, Definitions};
use rustc_hir::lang_items;
use rustc_hir::lang_items::PanicLocationLangItem;
use rustc_hir::{HirId, Node, TraitCandidate};
use rustc_hir::{ItemKind, ItemLocalId, ItemLocalMap, ItemLocalSet};
use rustc_hir::lang_items::{self, PanicLocationLangItem};
use rustc_hir::{HirId, ItemKind, ItemLocalId, ItemLocalMap, ItemLocalSet, Node, TraitCandidate};
use rustc_index::vec::{Idx, IndexVec};
use rustc_macros::HashStable;
use rustc_session::config::{BorrowckMode, CrateType, OutputFilenames};
@ -1396,6 +1383,66 @@ pub fn is_suitable_region(&self, region: Region<'tcx>) -> Option<FreeRegionInfo>
})
}
pub fn return_type_impl_or_dyn_trait(&self, scope_def_id: DefId) -> Option<(Span, bool)> {
let hir_id = self.hir().as_local_hir_id(scope_def_id.expect_local());
let hir_output = match self.hir().get(hir_id) {
Node::Item(hir::Item {
kind:
ItemKind::Fn(
hir::FnSig {
decl: hir::FnDecl { output: hir::FnRetTy::Return(ty), .. },
..
},
..,
),
..
})
| Node::ImplItem(hir::ImplItem {
kind:
hir::ImplItemKind::Fn(
hir::FnSig {
decl: hir::FnDecl { output: hir::FnRetTy::Return(ty), .. },
..
},
_,
),
..
})
| Node::TraitItem(hir::TraitItem {
kind:
hir::TraitItemKind::Fn(
hir::FnSig {
decl: hir::FnDecl { output: hir::FnRetTy::Return(ty), .. },
..
},
_,
),
..
}) => ty,
_ => return None,
};
let ret_ty = self.type_of(scope_def_id);
match ret_ty.kind {
ty::FnDef(_, _) => {
let sig = ret_ty.fn_sig(*self);
let output = self.erase_late_bound_regions(&sig.output());
if output.is_impl_trait() {
let fn_decl = self.hir().fn_decl_by_hir_id(hir_id).unwrap();
Some((fn_decl.output.span(), false))
} else {
let mut v = TraitObjectVisitor(vec![]);
rustc_hir::intravisit::walk_ty(&mut v, hir_output);
if v.0.len() == 1 {
return Some((v.0[0], true));
}
None
}
}
_ => None,
}
}
pub fn return_type_impl_trait(&self, scope_def_id: DefId) -> Option<(Ty<'tcx>, Span)> {
// HACK: `type_of_def_id()` will fail on these (#55796), so return `None`.
let hir_id = self.hir().as_local_hir_id(scope_def_id.expect_local());

19
src/librustc_middle/ty/diagnostics.rs
View file

@ -249,3 +249,22 @@ pub fn suggest_constraining_type_param(
true
}
}
pub struct TraitObjectVisitor(pub Vec<rustc_span::Span>);
impl<'v> hir::intravisit::Visitor<'v> for TraitObjectVisitor {
type Map = rustc_hir::intravisit::ErasedMap<'v>;
fn nested_visit_map(&mut self) -> hir::intravisit::NestedVisitorMap<Self::Map> {
hir::intravisit::NestedVisitorMap::None
}
fn visit_ty(&mut self, ty: &hir::Ty<'_>) {
if let hir::TyKind::TraitObject(
_,
hir::Lifetime { name: hir::LifetimeName::ImplicitObjectLifetimeDefault, .. },
) = ty.kind
{
self.0.push(ty.span);
}
}
}

13
src/test/ui/async-await/issues/issue-62097.stderr
View file

@ -2,15 +2,12 @@ error: cannot infer an appropriate lifetime
--> $DIR/issue-62097.rs:12:31
|
LL | pub async fn run_dummy_fn(&self) {
| ^^^^^ ...but this borrow...
| ^^^^^
| |
| data with this lifetime...
| ...is captured here...
LL | foo(|| self.bar()).await;
| --- this return type evaluates to the `'static` lifetime...
|
note: ...can't outlive the lifetime `'_` as defined on the method body at 12:31
--> $DIR/issue-62097.rs:12:31
|
LL | pub async fn run_dummy_fn(&self) {
| ^
| --- ...and required to be `'static` by this
error: aborting due to previous error

8
src/test/ui/builtin-superkinds/builtin-superkinds-self-type.stderr
View file

@ -2,15 +2,9 @@ error[E0310]: the parameter type `T` may not live long enough
--> $DIR/builtin-superkinds-self-type.rs:10:16
|
LL | impl <T: Sync> Foo for T { }
| -- ^^^
| -- ^^^ ...so that the type `T` will meet its required lifetime bounds
| |
| help: consider adding an explicit lifetime bound...: `T: 'static +`
|
note: ...so that the type `T` will meet its required lifetime bounds
--> $DIR/builtin-superkinds-self-type.rs:10:16
|
LL | impl <T: Sync> Foo for T { }
| ^^^
error: aborting due to previous error

8
src/test/ui/feature-gates/feature-gate-infer_static_outlives_requirements.stderr
View file

@ -4,13 +4,7 @@ error[E0310]: the parameter type `U` may not live long enough
LL | struct Foo<U> {
| - help: consider adding an explicit lifetime bound...: `U: 'static`
LL | bar: Bar<U>
| ^^^^^^^^^^^
|
note: ...so that the type `U` will meet its required lifetime bounds
--> $DIR/feature-gate-infer_static_outlives_requirements.rs:5:5
|
LL | bar: Bar<U>
| ^^^^^^^^^^^
| ^^^^^^^^^^^ ...so that the type `U` will meet its required lifetime bounds
error: aborting due to previous error

6
src/test/ui/generic-associated-types/impl_bounds.stderr
View file

@ -5,11 +5,7 @@ LL | type A<'a> where Self: 'static = (&'a ());
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: consider adding an explicit lifetime bound `T: 'static`...
note: ...so that the type `Fooy<T>` will meet its required lifetime bounds
--> $DIR/impl_bounds.rs:15:5
|
LL | type A<'a> where Self: 'static = (&'a ());
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
= note: ...so that the type `Fooy<T>` will meet its required lifetime bounds
error[E0478]: lifetime bound not satisfied
--> $DIR/impl_bounds.rs:17:5

56
src/test/ui/impl-trait/must_outlive_least_region_or_bound.stderr
View file

@ -2,55 +2,43 @@ error: cannot infer an appropriate lifetime
--> $DIR/must_outlive_least_region_or_bound.rs:3:35
|
LL | fn elided(x: &i32) -> impl Copy { x }
| --------- ^ ...but this borrow...
| |
| this return type evaluates to the `'static` lifetime...
| ---- --------- ^ ...and is captured here
| | |
| | ...is required to be `'static` by this...
| data with this lifetime...
|
note: ...can't outlive the anonymous lifetime #1 defined on the function body at 3:1
--> $DIR/must_outlive_least_region_or_bound.rs:3:1
|
LL | fn elided(x: &i32) -> impl Copy { x }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
help: you can add a bound to the return type to make it last less than `'static` and match the anonymous lifetime #1 defined on the function body at 3:1
help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 3:1
|
LL | fn elided(x: &i32) -> impl Copy + '_ { x }
| ^^^^^^^^^^^^^^
| ^^^^
error: cannot infer an appropriate lifetime
--> $DIR/must_outlive_least_region_or_bound.rs:6:44
|
LL | fn explicit<'a>(x: &'a i32) -> impl Copy { x }
| --------- ^ ...but this borrow...
| |
| this return type evaluates to the `'static` lifetime...
| ------- --------- ^ ...and is captured here
| | |
| | ...is required to be `'static` by this...
| data with this lifetime...
|
note: ...can't outlive the lifetime `'a` as defined on the function body at 6:13
--> $DIR/must_outlive_least_region_or_bound.rs:6:13
|
LL | fn explicit<'a>(x: &'a i32) -> impl Copy { x }
| ^^
help: you can add a bound to the return type to make it last less than `'static` and match the lifetime `'a` as defined on the function body at 6:13
help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the lifetime `'a` as defined on the function body at 6:13
|
LL | fn explicit<'a>(x: &'a i32) -> impl Copy + 'a { x }
| ^^^^^^^^^^^^^^
| ^^^^
error: cannot infer an appropriate lifetime
--> $DIR/must_outlive_least_region_or_bound.rs:12:69
|
LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x }
| -------------------------------- ^ ...but this borrow...
| |
| this return type evaluates to the `'static` lifetime...
| ------- -------------------------------- ^ ...and is captured here
| | |
| | ...is required to be `'static` by this...
| data with this lifetime...
|
note: ...can't outlive the lifetime `'a` as defined on the function body at 12:15
--> $DIR/must_outlive_least_region_or_bound.rs:12:15
|
LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x }
| ^^
help: you can add a bound to the return type to make it last less than `'static` and match the lifetime `'a` as defined on the function body at 12:15
help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the lifetime `'a` as defined on the function body at 12:15
|
LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static + 'a { x }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| ^^^^
error[E0623]: lifetime mismatch
--> $DIR/must_outlive_least_region_or_bound.rs:17:61
@ -65,15 +53,9 @@ error[E0310]: the parameter type `T` may not live long enough
--> $DIR/must_outlive_least_region_or_bound.rs:22:51
|
LL | fn ty_param_wont_outlive_static<T:Debug>(x: T) -> impl Debug + 'static {
| -- ^^^^^^^^^^^^^^^^^^^^
| -- ^^^^^^^^^^^^^^^^^^^^ ...so that the type `T` will meet its required lifetime bounds
| |
| help: consider adding an explicit lifetime bound...: `T: 'static +`
|
note: ...so that the type `T` will meet its required lifetime bounds
--> $DIR/must_outlive_least_region_or_bound.rs:22:51
|
LL | fn ty_param_wont_outlive_static<T:Debug>(x: T) -> impl Debug + 'static {
| ^^^^^^^^^^^^^^^^^^^^
error: aborting due to 5 previous errors

32
src/test/ui/impl-trait/static-return-lifetime-infered.stderr
View file

@ -2,43 +2,35 @@ error: cannot infer an appropriate lifetime
--> $DIR/static-return-lifetime-infered.rs:7:16
|
LL | fn iter_values_anon(&self) -> impl Iterator<Item=u32> {
| ----------------------- this return type evaluates to the `'static` lifetime...
| ----- ----------------------- ...is required to be `'static` by this...
| |
| data with this lifetime...
LL | self.x.iter().map(|a| a.0)
| ------ ^^^^
| |
| ...but this borrow...
| ...and is captured here
|
note: ...can't outlive the anonymous lifetime #1 defined on the method body at 6:5
--> $DIR/static-return-lifetime-infered.rs:6:5
|
LL | / fn iter_values_anon(&self) -> impl Iterator<Item=u32> {
LL | | self.x.iter().map(|a| a.0)
LL | | }
| |_____^
help: you can add a bound to the return type to make it last less than `'static` and match the anonymous lifetime #1 defined on the method body at 6:5
help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime #1 defined on the method body at 6:5
|
LL | fn iter_values_anon(&self) -> impl Iterator<Item=u32> + '_ {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| ^^^^
error: cannot infer an appropriate lifetime
--> $DIR/static-return-lifetime-infered.rs:11:16
|
LL | fn iter_values<'a>(&'a self) -> impl Iterator<Item=u32> {
| ----------------------- this return type evaluates to the `'static` lifetime...
| -------- ----------------------- ...is required to be `'static` by this...
| |
| data with this lifetime...
LL | self.x.iter().map(|a| a.0)
| ------ ^^^^
| |
| ...but this borrow...
| ...and is captured here
|
note: ...can't outlive the lifetime `'a` as defined on the method body at 10:20
--> $DIR/static-return-lifetime-infered.rs:10:20
|
LL | fn iter_values<'a>(&'a self) -> impl Iterator<Item=u32> {
| ^^
help: you can add a bound to the return type to make it last less than `'static` and match the lifetime `'a` as defined on the method body at 10:20
help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the lifetime `'a` as defined on the method body at 10:20
|
LL | fn iter_values<'a>(&'a self) -> impl Iterator<Item=u32> + 'a {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| ^^^^
error: aborting due to 2 previous errors

8
src/test/ui/impl-trait/type_parameters_captured.stderr
View file

@ -2,15 +2,9 @@ error[E0310]: the parameter type `T` may not live long enough
--> $DIR/type_parameters_captured.rs:7:20
|
LL | fn foo<T>(x: T) -> impl Any + 'static {
| - ^^^^^^^^^^^^^^^^^^
| - ^^^^^^^^^^^^^^^^^^ ...so that the type `T` will meet its required lifetime bounds
| |
| help: consider adding an explicit lifetime bound...: `T: 'static`
|
note: ...so that the type `T` will meet its required lifetime bounds
--> $DIR/type_parameters_captured.rs:7:20
|
LL | fn foo<T>(x: T) -> impl Any + 'static {
| ^^^^^^^^^^^^^^^^^^
error: aborting due to previous error

10
src/test/ui/issues/issue-16922.nll.stderr Normal file
View file

@ -0,0 +1,10 @@
error: lifetime may not live long enough
--> $DIR/issue-16922.rs:4:5
|
LL | fn foo<T: Any>(value: &T) -> Box<dyn Any> {
| - let's call the lifetime of this reference `'1`
LL | Box::new(value) as Box<dyn Any>
| ^^^^^^^^^^^^^^^ cast requires that `'1` must outlive `'static`
error: aborting due to previous error

2
src/test/ui/issues/issue-16922.rs
View file

@ -2,7 +2,7 @@
fn foo<T: Any>(value: &T) -> Box<dyn Any> {
Box::new(value) as Box<dyn Any>
//~^ ERROR explicit lifetime required in the type of `value` [E0621]
//~^ ERROR cannot infer an appropriate lifetime
}
fn main() {

17
src/test/ui/issues/issue-16922.stderr
View file

@ -1,11 +1,18 @@
error[E0621]: explicit lifetime required in the type of `value`
--> $DIR/issue-16922.rs:4:5
error: cannot infer an appropriate lifetime
--> $DIR/issue-16922.rs:4:14
|
LL | fn foo<T: Any>(value: &T) -> Box<dyn Any> {
| -- help: add explicit lifetime `'static` to the type of `value`: `&'static T`
| -- data with this lifetime...
LL | Box::new(value) as Box<dyn Any>
| ^^^^^^^^^^^^^^^ lifetime `'static` required
| ---------^^^^^-
| | |
| | ...and is captured here
| ...is required to be `'static` by this...
|
help: to permit non-static references in a `dyn Trait` value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 3:1
|
LL | fn foo<T: Any>(value: &T) -> Box<dyn Any + '_> {
| ^^^^
error: aborting due to previous error
For more information about this error, try `rustc --explain E0621`.

46
src/test/ui/lifetimes/lifetime-doesnt-live-long-enough.stderr
View file

@ -4,13 +4,7 @@ error[E0310]: the parameter type `T` may not live long enough
LL | struct Foo<T> {
| - help: consider adding an explicit lifetime bound...: `T: 'static`
LL | foo: &'static T
| ^^^^^^^^^^^^^^^
|
note: ...so that the reference type `&'static T` does not outlive the data it points at
--> $DIR/lifetime-doesnt-live-long-enough.rs:19:5
|
LL | foo: &'static T
| ^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^ ...so that the reference type `&'static T` does not outlive the data it points at
error[E0309]: the parameter type `K` may not live long enough
--> $DIR/lifetime-doesnt-live-long-enough.rs:24:19
@ -18,13 +12,7 @@ error[E0309]: the parameter type `K` may not live long enough
LL | trait X<K>: Sized {
| - help: consider adding an explicit lifetime bound...: `K: 'a`
LL | fn foo<'a, L: X<&'a Nested<K>>>();
| ^^^^^^^^^^^^^^^^
|
note: ...so that the reference type `&'a Nested<K>` does not outlive the data it points at
--> $DIR/lifetime-doesnt-live-long-enough.rs:24:19
|
LL | fn foo<'a, L: X<&'a Nested<K>>>();
| ^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^ ...so that the reference type `&'a Nested<K>` does not outlive the data it points at
error[E0309]: the parameter type `Self` may not live long enough
--> $DIR/lifetime-doesnt-live-long-enough.rs:28:19
@ -33,25 +21,15 @@ LL | fn bar<'a, L: X<&'a Nested<Self>>>();
| ^^^^^^^^^^^^^^^^^^^
|
= help: consider adding an explicit lifetime bound `Self: 'a`...
note: ...so that the reference type `&'a Nested<Self>` does not outlive the data it points at
--> $DIR/lifetime-doesnt-live-long-enough.rs:28:19
|
LL | fn bar<'a, L: X<&'a Nested<Self>>>();
| ^^^^^^^^^^^^^^^^^^^
= note: ...so that the reference type `&'a Nested<Self>` does not outlive the data it points at
error[E0309]: the parameter type `L` may not live long enough
--> $DIR/lifetime-doesnt-live-long-enough.rs:32:22
|
LL | fn baz<'a, L, M: X<&'a Nested<L>>>() {
| - ^^^^^^^^^^^^^^^^
| - ^^^^^^^^^^^^^^^^ ...so that the reference type `&'a Nested<L>` does not outlive the data it points at
| |
| help: consider adding an explicit lifetime bound...: `L: 'a`
|
note: ...so that the reference type `&'a Nested<L>` does not outlive the data it points at
--> $DIR/lifetime-doesnt-live-long-enough.rs:32:22
|
LL | fn baz<'a, L, M: X<&'a Nested<L>>>() {
| ^^^^^^^^^^^^^^^^
error[E0309]: the parameter type `K` may not live long enough
--> $DIR/lifetime-doesnt-live-long-enough.rs:41:33
@ -59,25 +37,15 @@ error[E0309]: the parameter type `K` may not live long enough
LL | impl<K> Nested<K> {
| - help: consider adding an explicit lifetime bound...: `K: 'a`
LL | fn generic_in_parent<'a, L: X<&'a Nested<K>>>() {
| ^^^^^^^^^^^^^^^^
|
note: ...so that the reference type `&'a Nested<K>` does not outlive the data it points at
--> $DIR/lifetime-doesnt-live-long-enough.rs:41:33
|
LL | fn generic_in_parent<'a, L: X<&'a Nested<K>>>() {
| ^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^ ...so that the reference type `&'a Nested<K>` does not outlive the data it points at
error[E0309]: the parameter type `M` may not live long enough
--> $DIR/lifetime-doesnt-live-long-enough.rs:44:36
|
LL | fn generic_in_child<'a, 'b, L: X<&'a Nested<M>>, M: 'b>() {
| ^^^^^^^^^^^^^^^^ -- help: consider adding an explicit lifetime bound...: `M: 'a +`
|
note: ...so that the reference type `&'a Nested<M>` does not outlive the data it points at
--> $DIR/lifetime-doesnt-live-long-enough.rs:44:36
|
LL | fn generic_in_child<'a, 'b, L: X<&'a Nested<M>>, M: 'b>() {
| ^^^^^^^^^^^^^^^^
| |
| ...so that the reference type `&'a Nested<M>` does not outlive the data it points at
error: aborting due to 6 previous errors

6
src/test/ui/nll/ty-outlives/projection-where-clause-env-wrong-bound.stderr
View file

@ -5,11 +5,7 @@ LL | bar::<T::Output>()
| ^^^^^^^^^^^^^^^^
|
= help: consider adding an explicit lifetime bound `<T as MyTrait<'a>>::Output: 'a`...
note: ...so that the type `<T as MyTrait<'a>>::Output` will meet its required lifetime bounds
--> $DIR/projection-where-clause-env-wrong-bound.rs:15:5
|
LL | bar::<T::Output>()
| ^^^^^^^^^^^^^^^^
= note: ...so that the type `<T as MyTrait<'a>>::Output` will meet its required lifetime bounds
error: aborting due to previous error

6
src/test/ui/nll/ty-outlives/projection-where-clause-env-wrong-lifetime.stderr
View file

@ -5,11 +5,7 @@ LL | bar::<<T as MyTrait<'a>>::Output>()
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: consider adding an explicit lifetime bound `<T as MyTrait<'a>>::Output: 'a`...
note: ...so that the type `<T as MyTrait<'a>>::Output` will meet its required lifetime bounds
--> $DIR/projection-where-clause-env-wrong-lifetime.rs:14:5
|
LL | bar::<<T as MyTrait<'a>>::Output>()
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
= note: ...so that the type `<T as MyTrait<'a>>::Output` will meet its required lifetime bounds
error: aborting due to previous error

6
src/test/ui/object-lifetime/object-lifetime-default-from-box-error.nll.stderr
View file

@ -1,11 +1,11 @@
error[E0621]: explicit lifetime required in the type of `ss`
error: lifetime may not live long enough
--> $DIR/object-lifetime-default-from-box-error.rs:18:5
|
LL | fn load(ss: &mut SomeStruct) -> Box<dyn SomeTrait> {
| --------------- help: add explicit lifetime `'static` to the type of `ss`: `&mut SomeStruct<'static>`
| -- has type `&mut SomeStruct<'1>`
...
LL | ss.r
| ^^^^ lifetime `'static` required
| ^^^^ returning this value requires that `'1` must outlive `'static`
error[E0507]: cannot move out of `ss.r` which is behind a mutable reference
--> $DIR/object-lifetime-default-from-box-error.rs:18:5

2
src/test/ui/object-lifetime/object-lifetime-default-from-box-error.rs
View file

@ -15,7 +15,7 @@ fn load(ss: &mut SomeStruct) -> Box<dyn SomeTrait> {
// `Box<SomeTrait>` defaults to a `'static` bound, so this return
// is illegal.
ss.r //~ ERROR explicit lifetime required in the type of `ss` [E0621]
ss.r //~ ERROR cannot infer an appropriate lifetime
}
fn store(ss: &mut SomeStruct, b: Box<dyn SomeTrait>) {

11
src/test/ui/object-lifetime/object-lifetime-default-from-box-error.stderr
View file

@ -1,11 +1,16 @@
error[E0621]: explicit lifetime required in the type of `ss`
error: cannot infer an appropriate lifetime
--> $DIR/object-lifetime-default-from-box-error.rs:18:5
|
LL | fn load(ss: &mut SomeStruct) -> Box<dyn SomeTrait> {
| --------------- help: add explicit lifetime `'static` to the type of `ss`: `&mut SomeStruct<'static>`
| --------------- data with this lifetime...
...
LL | ss.r
| ^^^^ lifetime `'static` required
| ^^^^ ...is captured and required to be `'static` here
|
help: to permit non-static references in a `dyn Trait` value, you can add an explicit bound for the anonymous lifetime #2 defined on the function body at 14:1
|
LL | fn load(ss: &mut SomeStruct) -> Box<dyn SomeTrait + '_> {
| ^^^^
error[E0621]: explicit lifetime required in the type of `ss`
--> $DIR/object-lifetime-default-from-box-error.rs:31:12

10
src/test/ui/regions/region-object-lifetime-in-coercion.nll.stderr
View file

@ -14,17 +14,17 @@ LL | fn b(v: &[u8]) -> Box<dyn Foo + 'static> {
LL | Box::new(v)
| ^^^^^^^^^^^ lifetime `'static` required
error[E0621]: explicit lifetime required in the type of `v`
--> $DIR/region-object-lifetime-in-coercion.rs:21:5
error: lifetime may not live long enough
--> $DIR/region-object-lifetime-in-coercion.rs:20:5
|
LL | fn c(v: &[u8]) -> Box<dyn Foo> {
| ----- help: add explicit lifetime `'static` to the type of `v`: `&'static [u8]`
| - let's call the lifetime of this reference `'1`
...
LL | Box::new(v)
| ^^^^^^^^^^^ lifetime `'static` required
| ^^^^^^^^^^^ returning this value requires that `'1` must outlive `'static`
error: lifetime may not live long enough
--> $DIR/region-object-lifetime-in-coercion.rs:26:5
--> $DIR/region-object-lifetime-in-coercion.rs:24:5
|
LL | fn d<'a,'b>(v: &'a [u8]) -> Box<dyn Foo+'b> {
| -- -- lifetime `'b` defined here

9
src/test/ui/regions/region-object-lifetime-in-coercion.rs
View file

@ -11,20 +11,17 @@ fn a(v: &[u8]) -> Box<dyn Foo + 'static> {
}
fn b(v: &[u8]) -> Box<dyn Foo + 'static> {
Box::new(v)
//~^ ERROR explicit lifetime required in the type of `v` [E0621]
Box::new(v) //~ ERROR explicit lifetime required in the type of `v` [E0621]
}
fn c(v: &[u8]) -> Box<dyn Foo> {
// same as previous case due to RFC 599
Box::new(v)
//~^ ERROR explicit lifetime required in the type of `v` [E0621]
Box::new(v) //~ ERROR cannot infer an appropriate lifetime
}
fn d<'a,'b>(v: &'a [u8]) -> Box<dyn Foo+'b> {
Box::new(v)
//~^ ERROR cannot infer an appropriate lifetime due to conflicting
Box::new(v) //~ ERROR cannot infer an appropriate lifetime due to conflicting
}
fn e<'a:'b,'b>(v: &'a [u8]) -> Box<dyn Foo+'b> {

30
src/test/ui/regions/region-object-lifetime-in-coercion.stderr
View file

@ -14,40 +14,48 @@ LL | fn b(v: &[u8]) -> Box<dyn Foo + 'static> {
LL | Box::new(v)
| ^^^^^^^^^^^ lifetime `'static` required
error[E0621]: explicit lifetime required in the type of `v`
--> $DIR/region-object-lifetime-in-coercion.rs:21:5
error: cannot infer an appropriate lifetime
--> $DIR/region-object-lifetime-in-coercion.rs:20:14
|
LL | fn c(v: &[u8]) -> Box<dyn Foo> {
| ----- help: add explicit lifetime `'static` to the type of `v`: `&'static [u8]`
| ----- data with this lifetime...
...
LL | Box::new(v)
| ^^^^^^^^^^^ lifetime `'static` required
| ---------^-
| | |
| | ...and is captured here
| ...is required to be `'static` by this...
|
help: to permit non-static references in a `dyn Trait` value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 17:1
|
LL | fn c(v: &[u8]) -> Box<dyn Foo + '_> {
| ^^^^
error[E0495]: cannot infer an appropriate lifetime due to conflicting requirements
--> $DIR/region-object-lifetime-in-coercion.rs:26:14
--> $DIR/region-object-lifetime-in-coercion.rs:24:14
|
LL | Box::new(v)
| ^
|
note: first, the lifetime cannot outlive the lifetime `'a` as defined on the function body at 25:6...
--> $DIR/region-object-lifetime-in-coercion.rs:25:6
note: first, the lifetime cannot outlive the lifetime `'a` as defined on the function body at 23:6...
--> $DIR/region-object-lifetime-in-coercion.rs:23:6
|
LL | fn d<'a,'b>(v: &'a [u8]) -> Box<dyn Foo+'b> {
| ^^
note: ...so that the expression is assignable
--> $DIR/region-object-lifetime-in-coercion.rs:26:14
--> $DIR/region-object-lifetime-in-coercion.rs:24:14
|
LL | Box::new(v)
| ^
= note: expected `&[u8]`
found `&'a [u8]`
note: but, the lifetime must be valid for the lifetime `'b` as defined on the function body at 25:9...
--> $DIR/region-object-lifetime-in-coercion.rs:25:9
note: but, the lifetime must be valid for the lifetime `'b` as defined on the function body at 23:9...
--> $DIR/region-object-lifetime-in-coercion.rs:23:9
|
LL | fn d<'a,'b>(v: &'a [u8]) -> Box<dyn Foo+'b> {
| ^^
note: ...so that the expression is assignable
--> $DIR/region-object-lifetime-in-coercion.rs:26:5
--> $DIR/region-object-lifetime-in-coercion.rs:24:5
|
LL | Box::new(v)
| ^^^^^^^^^^^

24
src/test/ui/regions/regions-close-associated-type-into-object.stderr
View file

@ -5,11 +5,7 @@ LL | Box::new(item)
| ^^^^^^^^^^^^^^
|
= help: consider adding an explicit lifetime bound `<T as Iter>::Item: 'static`...
note: ...so that the type `<T as Iter>::Item` will meet its required lifetime bounds
--> $DIR/regions-close-associated-type-into-object.rs:15:5
|
LL | Box::new(item)
| ^^^^^^^^^^^^^^
= note: ...so that the type `<T as Iter>::Item` will meet its required lifetime bounds
error[E0310]: the associated type `<T as Iter>::Item` may not live long enough
--> $DIR/regions-close-associated-type-into-object.rs:22:5
@ -18,11 +14,7 @@ LL | Box::new(item)
| ^^^^^^^^^^^^^^
|
= help: consider adding an explicit lifetime bound `<T as Iter>::Item: 'static`...
note: ...so that the type `std::boxed::Box<<T as Iter>::Item>` will meet its required lifetime bounds
--> $DIR/regions-close-associated-type-into-object.rs:22:5
|
LL | Box::new(item)
| ^^^^^^^^^^^^^^
= note: ...so that the type `std::boxed::Box<<T as Iter>::Item>` will meet its required lifetime bounds
error[E0309]: the associated type `<T as Iter>::Item` may not live long enough
--> $DIR/regions-close-associated-type-into-object.rs:28:5
@ -31,11 +23,7 @@ LL | Box::new(item)
| ^^^^^^^^^^^^^^
|
= help: consider adding an explicit lifetime bound `<T as Iter>::Item: 'a`...
note: ...so that the type `<T as Iter>::Item` will meet its required lifetime bounds
--> $DIR/regions-close-associated-type-into-object.rs:28:5
|
LL | Box::new(item)
| ^^^^^^^^^^^^^^
= note: ...so that the type `<T as Iter>::Item` will meet its required lifetime bounds
error[E0309]: the associated type `<T as Iter>::Item` may not live long enough
--> $DIR/regions-close-associated-type-into-object.rs:35:5
@ -44,11 +32,7 @@ LL | Box::new(item)
| ^^^^^^^^^^^^^^
|
= help: consider adding an explicit lifetime bound `<T as Iter>::Item: 'a`...
note: ...so that the type `std::boxed::Box<<T as Iter>::Item>` will meet its required lifetime bounds
--> $DIR/regions-close-associated-type-into-object.rs:35:5
|
LL | Box::new(item)
| ^^^^^^^^^^^^^^
= note: ...so that the type `std::boxed::Box<<T as Iter>::Item>` will meet its required lifetime bounds
error: aborting due to 4 previous errors

48
src/test/ui/regions/regions-close-object-into-object-5.stderr
View file

@ -5,13 +5,7 @@ LL | fn f<'a, T, U>(v: Box<A<T> + 'static>) -> Box<X + 'static> {
| - help: consider adding an explicit lifetime bound...: `T: 'static`
LL | // oh dear!
LL | box B(&*v) as Box<X>
| ^^^^^^^^^^
|
note: ...so that the type `B<'_, T>` will meet its required lifetime bounds
--> $DIR/regions-close-object-into-object-5.rs:17:5
|
LL | box B(&*v) as Box<X>
| ^^^^^^^^^^
| ^^^^^^^^^^ ...so that the type `B<'_, T>` will meet its required lifetime bounds
error[E0310]: the parameter type `T` may not live long enough
--> $DIR/regions-close-object-into-object-5.rs:17:9
@ -20,13 +14,7 @@ LL | fn f<'a, T, U>(v: Box<A<T> + 'static>) -> Box<X + 'static> {
| - help: consider adding an explicit lifetime bound...: `T: 'static`
LL | // oh dear!
LL | box B(&*v) as Box<X>
| ^
|
note: ...so that the type `T` will meet its required lifetime bounds
--> $DIR/regions-close-object-into-object-5.rs:17:9
|
LL | box B(&*v) as Box<X>
| ^
| ^ ...so that the type `T` will meet its required lifetime bounds
error[E0310]: the parameter type `T` may not live long enough
--> $DIR/regions-close-object-into-object-5.rs:17:9
@ -35,13 +23,7 @@ LL | fn f<'a, T, U>(v: Box<A<T> + 'static>) -> Box<X + 'static> {
| - help: consider adding an explicit lifetime bound...: `T: 'static`
LL | // oh dear!
LL | box B(&*v) as Box<X>
| ^^^^^^
|
note: ...so that the type `T` will meet its required lifetime bounds
--> $DIR/regions-close-object-into-object-5.rs:17:9
|
LL | box B(&*v) as Box<X>
| ^^^^^^
| ^^^^^^ ...so that the type `T` will meet its required lifetime bounds
error[E0310]: the parameter type `T` may not live long enough
--> $DIR/regions-close-object-into-object-5.rs:17:11
@ -50,13 +32,7 @@ LL | fn f<'a, T, U>(v: Box<A<T> + 'static>) -> Box<X + 'static> {
| - help: consider adding an explicit lifetime bound...: `T: 'static`
LL | // oh dear!
LL | box B(&*v) as Box<X>
| ^^^
|
note: ...so that the reference type `&dyn A<T>` does not outlive the data it points at
--> $DIR/regions-close-object-into-object-5.rs:17:11
|
LL | box B(&*v) as Box<X>
| ^^^
| ^^^ ...so that the reference type `&dyn A<T>` does not outlive the data it points at
error[E0310]: the parameter type `T` may not live long enough
--> $DIR/regions-close-object-into-object-5.rs:17:11
@ -65,13 +41,7 @@ LL | fn f<'a, T, U>(v: Box<A<T> + 'static>) -> Box<X + 'static> {
| - help: consider adding an explicit lifetime bound...: `T: 'static`
LL | // oh dear!
LL | box B(&*v) as Box<X>
| ^^^
|
note: ...so that the type `(dyn A<T> + 'static)` is not borrowed for too long
--> $DIR/regions-close-object-into-object-5.rs:17:11
|
LL | box B(&*v) as Box<X>
| ^^^
| ^^^ ...so that the type `(dyn A<T> + 'static)` is not borrowed for too long
error[E0310]: the parameter type `T` may not live long enough
--> $DIR/regions-close-object-into-object-5.rs:17:11
@ -80,13 +50,7 @@ LL | fn f<'a, T, U>(v: Box<A<T> + 'static>) -> Box<X + 'static> {
| - help: consider adding an explicit lifetime bound...: `T: 'static`
LL | // oh dear!
LL | box B(&*v) as Box<X>
| ^^^
|
note: ...so that the type `(dyn A<T> + 'static)` is not borrowed for too long
--> $DIR/regions-close-object-into-object-5.rs:17:11
|
LL | box B(&*v) as Box<X>
| ^^^
| ^^^ ...so that the type `(dyn A<T> + 'static)` is not borrowed for too long
error: aborting due to 6 previous errors

16
src/test/ui/regions/regions-close-over-type-parameter-1.stderr
View file

@ -4,13 +4,7 @@ error[E0310]: the parameter type `A` may not live long enough
LL | fn make_object1<A: SomeTrait>(v: A) -> Box<dyn SomeTrait + 'static> {
| -- help: consider adding an explicit lifetime bound...: `A: 'static +`
LL | box v as Box<dyn SomeTrait + 'static>
| ^^^^^
|
note: ...so that the type `A` will meet its required lifetime bounds
--> $DIR/regions-close-over-type-parameter-1.rs:12:5
|
LL | box v as Box<dyn SomeTrait + 'static>
| ^^^^^
| ^^^^^ ...so that the type `A` will meet its required lifetime bounds
error[E0309]: the parameter type `A` may not live long enough
--> $DIR/regions-close-over-type-parameter-1.rs:21:5
@ -18,13 +12,7 @@ error[E0309]: the parameter type `A` may not live long enough
LL | fn make_object3<'a, 'b, A: SomeTrait + 'a>(v: A) -> Box<dyn SomeTrait + 'b> {
| -- help: consider adding an explicit lifetime bound...: `A: 'b +`
LL | box v as Box<dyn SomeTrait + 'b>
| ^^^^^
|
note: ...so that the type `A` will meet its required lifetime bounds
--> $DIR/regions-close-over-type-parameter-1.rs:21:5
|
LL | box v as Box<dyn SomeTrait + 'b>
| ^^^^^
| ^^^^^ ...so that the type `A` will meet its required lifetime bounds
error: aborting due to 2 previous errors

32
src/test/ui/regions/regions-close-param-into-object.stderr
View file

@ -5,13 +5,7 @@ LL | fn p1<T>(v: T) -> Box<dyn X + 'static>
| - help: consider adding an explicit lifetime bound...: `T: 'static`
...
LL | Box::new(v)
| ^^^^^^^^^^^
|
note: ...so that the type `T` will meet its required lifetime bounds
--> $DIR/regions-close-param-into-object.rs:6:5
|
LL | Box::new(v)
| ^^^^^^^^^^^
| ^^^^^^^^^^^ ...so that the type `T` will meet its required lifetime bounds
error[E0310]: the parameter type `T` may not live long enough
--> $DIR/regions-close-param-into-object.rs:12:5
@ -20,13 +14,7 @@ LL | fn p2<T>(v: Box<T>) -> Box<dyn X + 'static>
| - help: consider adding an explicit lifetime bound...: `T: 'static`
...
LL | Box::new(v)
| ^^^^^^^^^^^
|
note: ...so that the type `std::boxed::Box<T>` will meet its required lifetime bounds
--> $DIR/regions-close-param-into-object.rs:12:5
|
LL | Box::new(v)
| ^^^^^^^^^^^
| ^^^^^^^^^^^ ...so that the type `std::boxed::Box<T>` will meet its required lifetime bounds
error[E0309]: the parameter type `T` may not live long enough
--> $DIR/regions-close-param-into-object.rs:18:5
@ -35,13 +23,7 @@ LL | fn p3<'a,T>(v: T) -> Box<dyn X + 'a>
| - help: consider adding an explicit lifetime bound...: `T: 'a`
...
LL | Box::new(v)
| ^^^^^^^^^^^
|
note: ...so that the type `T` will meet its required lifetime bounds
--> $DIR/regions-close-param-into-object.rs:18:5
|
LL | Box::new(v)
| ^^^^^^^^^^^
| ^^^^^^^^^^^ ...so that the type `T` will meet its required lifetime bounds
error[E0309]: the parameter type `T` may not live long enough
--> $DIR/regions-close-param-into-object.rs:24:5
@ -50,13 +32,7 @@ LL | fn p4<'a,T>(v: Box<T>) -> Box<dyn X + 'a>
| - help: consider adding an explicit lifetime bound...: `T: 'a`
...
LL | Box::new(v)
| ^^^^^^^^^^^
|
note: ...so that the type `std::boxed::Box<T>` will meet its required lifetime bounds
--> $DIR/regions-close-param-into-object.rs:24:5
|
LL | Box::new(v)
| ^^^^^^^^^^^
| ^^^^^^^^^^^ ...so that the type `std::boxed::Box<T>` will meet its required lifetime bounds
error: aborting due to 4 previous errors

35
src/test/ui/regions/regions-enum-not-wf.stderr
View file

@ -4,13 +4,7 @@ error[E0309]: the parameter type `T` may not live long enough
LL | enum Ref1<'a, T> {
| - help: consider adding an explicit lifetime bound...: `T: 'a`
LL | Ref1Variant1(RequireOutlives<'a, T>)
| ^^^^^^^^^^^^^^^^^^^^^^
|
note: ...so that the type `T` will meet its required lifetime bounds
--> $DIR/regions-enum-not-wf.rs:18:18
|
LL | Ref1Variant1(RequireOutlives<'a, T>)
| ^^^^^^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^^^^^^ ...so that the type `T` will meet its required lifetime bounds
error[E0309]: the parameter type `T` may not live long enough
--> $DIR/regions-enum-not-wf.rs:23:25
@ -19,13 +13,7 @@ LL | enum Ref2<'a, T> {
| - help: consider adding an explicit lifetime bound...: `T: 'a`
LL | Ref2Variant1,
LL | Ref2Variant2(isize, RequireOutlives<'a, T>),
| ^^^^^^^^^^^^^^^^^^^^^^
|
note: ...so that the type `T` will meet its required lifetime bounds
--> $DIR/regions-enum-not-wf.rs:23:25
|
LL | Ref2Variant2(isize, RequireOutlives<'a, T>),
| ^^^^^^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^^^^^^ ...so that the type `T` will meet its required lifetime bounds
error[E0309]: the parameter type `T` may not live long enough
--> $DIR/regions-enum-not-wf.rs:35:1
@ -37,16 +25,7 @@ LL | enum RefDouble<'a, 'b, T> {
LL | | RefDoubleVariant1(&'a RequireOutlives<'b, T>)
LL | |
LL | | }
| |_^
|
note: ...so that the type `T` will meet its required lifetime bounds
--> $DIR/regions-enum-not-wf.rs:35:1
|
LL | / enum RefDouble<'a, 'b, T> {
LL | | RefDoubleVariant1(&'a RequireOutlives<'b, T>)
LL | |
LL | | }
| |_^
| |_^ ...so that the type `T` will meet its required lifetime bounds
error[E0309]: the parameter type `T` may not live long enough
--> $DIR/regions-enum-not-wf.rs:36:23
@ -54,13 +33,7 @@ error[E0309]: the parameter type `T` may not live long enough
LL | enum RefDouble<'a, 'b, T> {
| - help: consider adding an explicit lifetime bound...: `T: 'b`
LL | RefDoubleVariant1(&'a RequireOutlives<'b, T>)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
|
note: ...so that the type `T` will meet its required lifetime bounds
--> $DIR/regions-enum-not-wf.rs:36:23
|
LL | RefDoubleVariant1(&'a RequireOutlives<'b, T>)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ ...so that the type `T` will meet its required lifetime bounds
error: aborting due to 4 previous errors

8
src/test/ui/regions/regions-implied-bounds-projection-gap-1.stderr
View file

@ -5,13 +5,7 @@ LL | fn func<'x, T:Trait1<'x>>(t: &'x T::Foo)
| -- help: consider adding an explicit lifetime bound...: `T: 'x +`
LL | {
LL | wf::<&'x T>();
| ^^^^^
|
note: ...so that the reference type `&'x T` does not outlive the data it points at
--> $DIR/regions-implied-bounds-projection-gap-1.rs:16:10
|
LL | wf::<&'x T>();
| ^^^^^
| ^^^^^ ...so that the reference type `&'x T` does not outlive the data it points at
error: aborting due to previous error

6
src/test/ui/regions/regions-infer-bound-from-trait-self.stderr
View file

@ -5,11 +5,7 @@ LL | check_bound(x, self)
| ^^^^^^^^^^^
|
= help: consider adding an explicit lifetime bound `Self: 'a`...
note: ...so that the type `Self` will meet its required lifetime bounds
--> $DIR/regions-infer-bound-from-trait-self.rs:46:9
|
LL | check_bound(x, self)
| ^^^^^^^^^^^
= note: ...so that the type `Self` will meet its required lifetime bounds
error: aborting due to previous error

16
src/test/ui/regions/regions-infer-bound-from-trait.stderr
View file

@ -4,13 +4,7 @@ error[E0309]: the parameter type `A` may not live long enough
LL | fn bar1<'a,A>(x: Inv<'a>, a: A) {
| - help: consider adding an explicit lifetime bound...: `A: 'a`
LL | check_bound(x, a)
| ^^^^^^^^^^^
|
note: ...so that the type `A` will meet its required lifetime bounds
--> $DIR/regions-infer-bound-from-trait.rs:33:5
|
LL | check_bound(x, a)
| ^^^^^^^^^^^
| ^^^^^^^^^^^ ...so that the type `A` will meet its required lifetime bounds
error[E0309]: the parameter type `A` may not live long enough
--> $DIR/regions-infer-bound-from-trait.rs:37:5
@ -18,13 +12,7 @@ error[E0309]: the parameter type `A` may not live long enough
LL | fn bar2<'a,'b,A:Is<'b>>(x: Inv<'a>, y: Inv<'b>, a: A) {
| -- help: consider adding an explicit lifetime bound...: `A: 'a +`
LL | check_bound(x, a)
| ^^^^^^^^^^^
|
note: ...so that the type `A` will meet its required lifetime bounds
--> $DIR/regions-infer-bound-from-trait.rs:37:5
|
LL | check_bound(x, a)
| ^^^^^^^^^^^
| ^^^^^^^^^^^ ...so that the type `A` will meet its required lifetime bounds
error: aborting due to 2 previous errors

8
src/test/ui/rfc-2093-infer-outlives/dont-infer-static.stderr
View file

@ -4,13 +4,7 @@ error[E0310]: the parameter type `U` may not live long enough
LL | struct Foo<U> {
| - help: consider adding an explicit lifetime bound...: `U: 'static`
LL | bar: Bar<U>
| ^^^^^^^^^^^
|
note: ...so that the type `U` will meet its required lifetime bounds
--> $DIR/dont-infer-static.rs:8:5
|
LL | bar: Bar<U>
| ^^^^^^^^^^^
| ^^^^^^^^^^^ ...so that the type `U` will meet its required lifetime bounds
error: aborting due to previous error

35
src/test/ui/rfc-2093-infer-outlives/regions-enum-not-wf.stderr
View file

@ -4,13 +4,7 @@ error[E0309]: the parameter type `T` may not live long enough
LL | enum Ref1<'a, T> {
| - help: consider adding an explicit lifetime bound...: `T: 'a`
LL | Ref1Variant1(RequireOutlives<'a, T>)
| ^^^^^^^^^^^^^^^^^^^^^^
|
note: ...so that the type `T` will meet its required lifetime bounds
--> $DIR/regions-enum-not-wf.rs:18:18
|
LL | Ref1Variant1(RequireOutlives<'a, T>)
| ^^^^^^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^^^^^^ ...so that the type `T` will meet its required lifetime bounds
error[E0309]: the parameter type `T` may not live long enough
--> $DIR/regions-enum-not-wf.rs:23:25
@ -19,13 +13,7 @@ LL | enum Ref2<'a, T> {
| - help: consider adding an explicit lifetime bound...: `T: 'a`
LL | Ref2Variant1,
LL | Ref2Variant2(isize, RequireOutlives<'a, T>),
| ^^^^^^^^^^^^^^^^^^^^^^
|
note: ...so that the type `T` will meet its required lifetime bounds
--> $DIR/regions-enum-not-wf.rs:23:25
|
LL | Ref2Variant2(isize, RequireOutlives<'a, T>),
| ^^^^^^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^^^^^^ ...so that the type `T` will meet its required lifetime bounds
error[E0309]: the parameter type `T` may not live long enough
--> $DIR/regions-enum-not-wf.rs:35:1
@ -37,16 +25,7 @@ LL | enum RefDouble<'a, 'b, T> {
LL | | RefDoubleVariant1(&'a RequireOutlives<'b, T>)
LL | |
LL | | }
| |_^
|
note: ...so that the type `T` will meet its required lifetime bounds
--> $DIR/regions-enum-not-wf.rs:35:1
|
LL | / enum RefDouble<'a, 'b, T> {
LL | | RefDoubleVariant1(&'a RequireOutlives<'b, T>)
LL | |
LL | | }
| |_^
| |_^ ...so that the type `T` will meet its required lifetime bounds
error[E0309]: the parameter type `T` may not live long enough
--> $DIR/regions-enum-not-wf.rs:36:23
@ -54,13 +33,7 @@ error[E0309]: the parameter type `T` may not live long enough
LL | enum RefDouble<'a, 'b, T> {
| - help: consider adding an explicit lifetime bound...: `T: 'b`
LL | RefDoubleVariant1(&'a RequireOutlives<'b, T>)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
|
note: ...so that the type `T` will meet its required lifetime bounds
--> $DIR/regions-enum-not-wf.rs:36:23
|
LL | RefDoubleVariant1(&'a RequireOutlives<'b, T>)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ ...so that the type `T` will meet its required lifetime bounds
error: aborting due to 4 previous errors

16
src/test/ui/rfc-2093-infer-outlives/regions-struct-not-wf.stderr
View file

@ -4,13 +4,7 @@ error[E0309]: the parameter type `T` may not live long enough
LL | impl<'a, T> Trait<'a, T> for usize {
| - help: consider adding an explicit lifetime bound...: `T: 'a`
LL | type Out = &'a T;
| ^^^^^^^^^^^^^^^^^
|
note: ...so that the reference type `&'a T` does not outlive the data it points at
--> $DIR/regions-struct-not-wf.rs:13:5
|
LL | type Out = &'a T;
| ^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^ ...so that the reference type `&'a T` does not outlive the data it points at
error[E0309]: the parameter type `T` may not live long enough
--> $DIR/regions-struct-not-wf.rs:21:5
@ -18,13 +12,7 @@ error[E0309]: the parameter type `T` may not live long enough
LL | impl<'a, T> Trait<'a, T> for u32 {
| - help: consider adding an explicit lifetime bound...: `T: 'a`
LL | type Out = RefOk<'a, T>;
| ^^^^^^^^^^^^^^^^^^^^^^^^
|
note: ...so that the type `T` will meet its required lifetime bounds
--> $DIR/regions-struct-not-wf.rs:21:5
|
LL | type Out = RefOk<'a, T>;
| ^^^^^^^^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^^^^^^^^ ...so that the type `T` will meet its required lifetime bounds
error[E0491]: in type `&'a &'b T`, reference has a longer lifetime than the data it references
--> $DIR/regions-struct-not-wf.rs:25:5

13
src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait-async.stderr
View file

@ -2,15 +2,10 @@ error: cannot infer an appropriate lifetime
--> $DIR/arbitrary_self_types_pin_lifetime_impl_trait-async.rs:8:16
|
LL | async fn f(self: Pin<&Self>) -> impl Clone { self }
| ^^^^ ---------- this return type evaluates to the `'static` lifetime...
| |
| ...but this borrow...
|
note: ...can't outlive the lifetime `'_` as defined on the method body at 8:26
--> $DIR/arbitrary_self_types_pin_lifetime_impl_trait-async.rs:8:26
|
LL | async fn f(self: Pin<&Self>) -> impl Clone { self }
| ^
| ^^^^ ---------- ---------- ...and required to be `'static` by this
| | |
| | data with this lifetime...
| ...is captured here...
error: aborting due to previous error

16
src/test/ui/self/arbitrary_self_types_pin_lifetime_impl_trait.stderr
View file

@ -2,19 +2,15 @@ error: cannot infer an appropriate lifetime
--> $DIR/arbitrary_self_types_pin_lifetime_impl_trait.rs:6:44
|
LL | fn f(self: Pin<&Self>) -> impl Clone { self }
| ---------- ^^^^ ...but this borrow...
| |
| this return type evaluates to the `'static` lifetime...
| ---------- ---------- ^^^^ ...and is captured here
| | |
| | ...is required to be `'static` by this...
| data with this lifetime...
|
note: ...can't outlive the anonymous lifetime #1 defined on the method body at 6:5
--> $DIR/arbitrary_self_types_pin_lifetime_impl_trait.rs:6:5
|
LL | fn f(self: Pin<&Self>) -> impl Clone { self }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
help: you can add a bound to the return type to make it last less than `'static` and match the anonymous lifetime #1 defined on the method body at 6:5
help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime #1 defined on the method body at 6:5
|
LL | fn f(self: Pin<&Self>) -> impl Clone + '_ { self }
| ^^^^^^^^^^^^^^^
| ^^^^
error: aborting due to previous error

115
src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.nll.stderr Normal file
View file

@ -0,0 +1,115 @@
error[E0261]: use of undeclared lifetime name `'a`
--> $DIR/missing-lifetimes-in-signature.rs:37:11
|
LL | fn baz<G: 'a, T>(g: G, dest: &mut T) -> impl FnOnce() + '_
| - ^^ undeclared lifetime
| |
| help: consider introducing lifetime `'a` here: `'a,`
error: lifetime may not live long enough
--> $DIR/missing-lifetimes-in-signature.rs:15:37
|
LL | fn foo<G, T>(g: G, dest: &mut T) -> impl FnOnce()
| - ^^^^^^^^^^^^^ opaque type requires that `'1` must outlive `'static`
| |
| let's call the lifetime of this reference `'1`
|
help: to allow this `impl Trait` to capture borrowed data with lifetime `'1`, add `'_` as a bound
|
LL | fn foo<G, T>(g: G, dest: &mut T) -> impl FnOnce() + '_
| ^^^^^^^^^^^^^^^^^^
error[E0311]: the parameter type `G` may not live long enough
--> $DIR/missing-lifetimes-in-signature.rs:25:37
|
LL | fn bar<G, T>(g: G, dest: &mut T) -> impl FnOnce() + '_
| ^^^^^^^^^^^^^^^^^^
|
note: the parameter type `G` must be valid for the anonymous lifetime #1 defined on the function body at 25:1...
--> $DIR/missing-lifetimes-in-signature.rs:25:1
|
LL | / fn bar<G, T>(g: G, dest: &mut T) -> impl FnOnce() + '_
LL | |
LL | | where
LL | | G: Get<T>
... |
LL | | }
LL | | }
| |_^
error[E0311]: the parameter type `G` may not live long enough
--> $DIR/missing-lifetimes-in-signature.rs:47:45
|
LL | fn qux<'a, G: 'a, T>(g: G, dest: &mut T) -> impl FnOnce() + '_
| ^^^^^^^^^^^^^^^^^^
|
note: the parameter type `G` must be valid for the anonymous lifetime #1 defined on the function body at 47:1...
--> $DIR/missing-lifetimes-in-signature.rs:47:1
|
LL | / fn qux<'a, G: 'a, T>(g: G, dest: &mut T) -> impl FnOnce() + '_
LL | |
LL | | where
LL | | G: Get<T>
... |
LL | | }
LL | | }
| |_^
error[E0311]: the parameter type `G` may not live long enough
--> $DIR/missing-lifetimes-in-signature.rs:59:58
|
LL | fn qux<'b, G: Get<T> + 'b, T>(g: G, dest: &mut T) -> impl FnOnce() + '_ {
| ^^^^^^^^^^^^^^^^^^
|
note: the parameter type `G` must be valid for the anonymous lifetime #1 defined on the method body at 59:5...
--> $DIR/missing-lifetimes-in-signature.rs:59:5
|
LL | / fn qux<'b, G: Get<T> + 'b, T>(g: G, dest: &mut T) -> impl FnOnce() + '_ {
LL | |
LL | | move || {
LL | | *dest = g.get();
LL | | }
LL | | }
| |_____^
error[E0311]: the parameter type `G` may not live long enough
--> $DIR/missing-lifetimes-in-signature.rs:68:45
|
LL | fn bat<'a, G: 'a, T>(g: G, dest: &mut T) -> impl FnOnce() + '_ + 'a
| ^^^^^^^^^^^^^^^^^^^^^^^
|
note: the parameter type `G` must be valid for the anonymous lifetime #1 defined on the function body at 68:1...
--> $DIR/missing-lifetimes-in-signature.rs:68:1
|
LL | / fn bat<'a, G: 'a, T>(g: G, dest: &mut T) -> impl FnOnce() + '_ + 'a
LL | |
LL | | where
LL | | G: Get<T>
... |
LL | | }
LL | | }
| |_^
error[E0621]: explicit lifetime required in the type of `dest`
--> $DIR/missing-lifetimes-in-signature.rs:73:5
|
LL | fn bat<'a, G: 'a, T>(g: G, dest: &mut T) -> impl FnOnce() + '_ + 'a
| ------ help: add explicit lifetime `'a` to the type of `dest`: `&'a mut T`
...
LL | / move || {
LL | | *dest = g.get();
LL | | }
| |_____^ lifetime `'a` required
error[E0309]: the parameter type `G` may not live long enough
--> $DIR/missing-lifetimes-in-signature.rs:79:44
|
LL | fn bak<'a, G, T>(g: G, dest: &'a mut T) -> impl FnOnce() + 'a
| ^^^^^^^^^^^^^^^^^^
|
= help: consider adding an explicit lifetime bound `G: 'a`...
error: aborting due to 8 previous errors
Some errors have detailed explanations: E0261, E0309, E0621.
For more information about an error, try `rustc --explain E0261`.

110
src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.rs Normal file
View file

@ -0,0 +1,110 @@
pub trait Get<T> {
fn get(self) -> T;
}
struct Foo {
x: usize,
}
impl Get<usize> for Foo {
fn get(self) -> usize {
self.x
}
}
fn foo<G, T>(g: G, dest: &mut T) -> impl FnOnce()
where
G: Get<T>
{
move || { //~ ERROR cannot infer an appropriate lifetime
*dest = g.get();
}
}
// After applying suggestion for `foo`:
fn bar<G, T>(g: G, dest: &mut T) -> impl FnOnce() + '_
//~^ ERROR the parameter type `G` may not live long enough
where
G: Get<T>
{
move || {
*dest = g.get();
}
}
// After applying suggestion for `bar`:
fn baz<G: 'a, T>(g: G, dest: &mut T) -> impl FnOnce() + '_ //~ ERROR undeclared lifetime
where
G: Get<T>
{
move || {
*dest = g.get();
}
}
// After applying suggestion for `baz`:
fn qux<'a, G: 'a, T>(g: G, dest: &mut T) -> impl FnOnce() + '_
//~^ ERROR the parameter type `G` may not live long enough
where
G: Get<T>
{
move || {
*dest = g.get();
}
}
// Same as above, but show that we pay attention to lifetime names from parent item
impl<'a> Foo {
fn qux<'b, G: Get<T> + 'b, T>(g: G, dest: &mut T) -> impl FnOnce() + '_ {
//~^ ERROR the parameter type `G` may not live long enough
move || {
*dest = g.get();
}
}
}
// After applying suggestion for `qux`:
fn bat<'a, G: 'a, T>(g: G, dest: &mut T) -> impl FnOnce() + '_ + 'a
//~^ ERROR explicit lifetime required in the type of `dest`
where
G: Get<T>
{
move || {
*dest = g.get();
}
}
// Potential incorrect attempt:
fn bak<'a, G, T>(g: G, dest: &'a mut T) -> impl FnOnce() + 'a
//~^ ERROR the parameter type `G` may not live long enough
where
G: Get<T>
{
move || {
*dest = g.get();
}
}
// We need to tie the lifetime of `G` with the lifetime of `&mut T` and the returned closure:
fn ok<'a, G: 'a, T>(g: G, dest: &'a mut T) -> impl FnOnce() + 'a
where
G: Get<T>
{
move || {
*dest = g.get();
}
}
// This also works. The `'_` isn't necessary but it's where we arrive to following the suggestions:
fn ok2<'a, G: 'a, T>(g: G, dest: &'a mut T) -> impl FnOnce() + '_ + 'a
where
G: Get<T>
{
move || {
*dest = g.get();
}
}
fn main() {}

126
src/test/ui/suggestions/lifetimes/missing-lifetimes-in-signature.stderr Normal file
View file

@ -0,0 +1,126 @@
error[E0261]: use of undeclared lifetime name `'a`
--> $DIR/missing-lifetimes-in-signature.rs:37:11
|
LL | fn baz<G: 'a, T>(g: G, dest: &mut T) -> impl FnOnce() + '_
| - ^^ undeclared lifetime
| |
| help: consider introducing lifetime `'a` here: `'a,`
error: cannot infer an appropriate lifetime
--> $DIR/missing-lifetimes-in-signature.rs:19:5
|
LL | fn foo<G, T>(g: G, dest: &mut T) -> impl FnOnce()
| ------ ------------- ...is required to be `'static` by this...
| |
| data with this lifetime...
...
LL | / move || {
LL | | *dest = g.get();
LL | | }
| |_____^ ...and is captured here
|
help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 15:1
|
LL | fn foo<G, T>(g: G, dest: &mut T) -> impl FnOnce() + '_
| ^^^^
error[E0311]: the parameter type `G` may not live long enough
--> $DIR/missing-lifetimes-in-signature.rs:25:37
|
LL | fn bar<G, T>(g: G, dest: &mut T) -> impl FnOnce() + '_
| ^^^^^^^^^^^^^^^^^^
|
note: the parameter type `G` must be valid for the anonymous lifetime #1 defined on the function body at 25:1...
--> $DIR/missing-lifetimes-in-signature.rs:25:1
|
LL | / fn bar<G, T>(g: G, dest: &mut T) -> impl FnOnce() + '_
LL | |
LL | | where
LL | | G: Get<T>
... |
LL | | }
LL | | }
| |_^
note: ...so that the type `[closure@$DIR/missing-lifetimes-in-signature.rs:30:5: 32:6 g:G, dest:&mut T]` will meet its required lifetime bounds
--> $DIR/missing-lifetimes-in-signature.rs:25:37
|
LL | fn bar<G, T>(g: G, dest: &mut T) -> impl FnOnce() + '_
| ^^^^^^^^^^^^^^^^^^
help: consider introducing an explicit lifetime bound
|
LL | fn bar<'a, G: 'a, T>(g: G, dest: &mut T) -> impl FnOnce() + '_ + 'a
| ^^^^^ ^^^^
error[E0311]: the parameter type `G` may not live long enough
--> $DIR/missing-lifetimes-in-signature.rs:47:45
|
LL | fn qux<'a, G: 'a, T>(g: G, dest: &mut T) -> impl FnOnce() + '_
| ^^^^^^^^^^^^^^^^^^
|
note: the parameter type `G` must be valid for the anonymous lifetime #1 defined on the function body at 47:1...
--> $DIR/missing-lifetimes-in-signature.rs:47:1
|
LL | / fn qux<'a, G: 'a, T>(g: G, dest: &mut T) -> impl FnOnce() + '_
LL | |
LL | | where
LL | | G: Get<T>
... |
LL | | }
LL | | }
| |_^
note: ...so that the type `[closure@$DIR/missing-lifetimes-in-signature.rs:52:5: 54:6 g:G, dest:&mut T]` will meet its required lifetime bounds
--> $DIR/missing-lifetimes-in-signature.rs:47:45
|
LL | fn qux<'a, G: 'a, T>(g: G, dest: &mut T) -> impl FnOnce() + '_
| ^^^^^^^^^^^^^^^^^^
help: consider introducing an explicit lifetime bound
|
LL | fn qux<'b, 'a, G: 'b + 'a, T>(g: G, dest: &mut T) -> impl FnOnce() + '_ + 'b
| ^^^ ^^^^^^^ ^^^^
error[E0311]: the parameter type `G` may not live long enough
--> $DIR/missing-lifetimes-in-signature.rs:59:58
|
LL | fn qux<'b, G: Get<T> + 'b, T>(g: G, dest: &mut T) -> impl FnOnce() + '_ {
| ^^^^^^^^^^^^^^^^^^
|
note: the parameter type `G` must be valid for the anonymous lifetime #1 defined on the method body at 59:5...
--> $DIR/missing-lifetimes-in-signature.rs:59:5
|
LL | / fn qux<'b, G: Get<T> + 'b, T>(g: G, dest: &mut T) -> impl FnOnce() + '_ {
LL | |
LL | | move || {
LL | | *dest = g.get();
LL | | }
LL | | }
| |_____^
note: ...so that the type `[closure@$DIR/missing-lifetimes-in-signature.rs:61:9: 63:10 g:G, dest:&mut T]` will meet its required lifetime bounds
--> $DIR/missing-lifetimes-in-signature.rs:59:58
|
LL | fn qux<'b, G: Get<T> + 'b, T>(g: G, dest: &mut T) -> impl FnOnce() + '_ {
| ^^^^^^^^^^^^^^^^^^
help: consider introducing an explicit lifetime bound
|
LL | fn qux<'c, 'b, G: 'c + Get<T> + 'b, T>(g: G, dest: &mut T) -> impl FnOnce() + '_ + 'c {
| ^^^ ^^^^^^^ ^^^^
error[E0621]: explicit lifetime required in the type of `dest`
--> $DIR/missing-lifetimes-in-signature.rs:68:45
|
LL | fn bat<'a, G: 'a, T>(g: G, dest: &mut T) -> impl FnOnce() + '_ + 'a
| ------ ^^^^^^^^^^^^^^^^^^^^^^^ lifetime `'a` required
| |
| help: add explicit lifetime `'a` to the type of `dest`: `&'a mut T`
error[E0309]: the parameter type `G` may not live long enough
--> $DIR/missing-lifetimes-in-signature.rs:79:44
|
LL | fn bak<'a, G, T>(g: G, dest: &'a mut T) -> impl FnOnce() + 'a
| - ^^^^^^^^^^^^^^^^^^ ...so that the type `[closure@$DIR/missing-lifetimes-in-signature.rs:84:5: 86:6 g:G, dest:&mut T]` will meet its required lifetime bounds
| |
| help: consider adding an explicit lifetime bound...: `G: 'a`
error: aborting due to 7 previous errors
Some errors have detailed explanations: E0261, E0309, E0621.
For more information about an error, try `rustc --explain E0261`.

8
src/test/ui/suggestions/suggest-impl-trait-lifetime.stderr
View file

@ -5,13 +5,7 @@ LL | fn foo(d: impl Debug) {
| ---------- help: consider adding an explicit lifetime bound...: `impl Debug + 'static`
LL |
LL | bar(d);
| ^^^
|
note: ...so that the type `impl Debug` will meet its required lifetime bounds
--> $DIR/suggest-impl-trait-lifetime.rs:7:5
|
LL | bar(d);
| ^^^
| ^^^ ...so that the type `impl Debug` will meet its required lifetime bounds
error: aborting due to previous error

8
src/test/ui/type-alias-impl-trait/generic_type_does_not_live_long_enough.stderr
View file

@ -22,16 +22,10 @@ error[E0310]: the parameter type `T` may not live long enough
--> $DIR/generic_type_does_not_live_long_enough.rs:9:1
|
LL | type WrongGeneric<T> = impl 'static;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ...so that the type `T` will meet its required lifetime bounds
...
LL | fn wrong_generic<T>(t: T) -> WrongGeneric<T> {
| - help: consider adding an explicit lifetime bound...: `T: 'static`
|
note: ...so that the type `T` will meet its required lifetime bounds
--> $DIR/generic_type_does_not_live_long_enough.rs:9:1
|
LL | type WrongGeneric<T> = impl 'static;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to 3 previous errors

31
src/test/ui/underscore-lifetime/dyn-trait-underscore.stderr
View file

@ -1,31 +1,16 @@
error[E0495]: cannot infer an appropriate lifetime for autoref due to conflicting requirements
error: cannot infer an appropriate lifetime
--> $DIR/dyn-trait-underscore.rs:8:20
|
LL | fn a<T>(items: &[T]) -> Box<dyn Iterator<Item=&T>> {
| ---- data with this lifetime...
LL | // ^^^^^^^^^^^^^^^^^^^^^ bound *here* defaults to `'static`
LL | Box::new(items.iter())
| ^^^^
| ---------------^^^^--- ...is captured and required to be `'static` here
|
note: first, the lifetime cannot outlive the anonymous lifetime #1 defined on the function body at 6:1...
--> $DIR/dyn-trait-underscore.rs:6:1
help: to permit non-static references in a `dyn Trait` value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 6:1
|
LL | / fn a<T>(items: &[T]) -> Box<dyn Iterator<Item=&T>> {
LL | | // ^^^^^^^^^^^^^^^^^^^^^ bound *here* defaults to `'static`
LL | | Box::new(items.iter())
LL | | }
| |_^
note: ...so that reference does not outlive borrowed content
--> $DIR/dyn-trait-underscore.rs:8:14
|
LL | Box::new(items.iter())
| ^^^^^
= note: but, the lifetime must be valid for the static lifetime...
note: ...so that the expression is assignable
--> $DIR/dyn-trait-underscore.rs:8:5
|
LL | Box::new(items.iter())
| ^^^^^^^^^^^^^^^^^^^^^^
= note: expected `std::boxed::Box<(dyn std::iter::Iterator<Item = &T> + 'static)>`
found `std::boxed::Box<dyn std::iter::Iterator<Item = &T>>`
LL | fn a<T>(items: &[T]) -> Box<dyn Iterator<Item=&T> + '_> {
| ^^^^
error: aborting due to previous error
For more information about this error, try `rustc --explain E0495`.

8
src/test/ui/wf/wf-impl-associated-type-region.stderr
View file

@ -4,13 +4,7 @@ error[E0309]: the parameter type `T` may not live long enough
LL | impl<'a, T> Foo<'a> for T {
| - help: consider adding an explicit lifetime bound...: `T: 'a`
LL | type Bar = &'a T;
| ^^^^^^^^^^^^^^^^^
|
note: ...so that the reference type `&'a T` does not outlive the data it points at
--> $DIR/wf-impl-associated-type-region.rs:10:5
|
LL | type Bar = &'a T;
| ^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^ ...so that the reference type `&'a T` does not outlive the data it points at
error: aborting due to previous error

16
src/test/ui/wf/wf-in-fn-type-static.stderr
View file

@ -5,13 +5,7 @@ LL | struct Foo<T> {
| - help: consider adding an explicit lifetime bound...: `T: 'static`
LL | // needs T: 'static
LL | x: fn() -> &'static T
| ^^^^^^^^^^^^^^^^^^^^^
|
note: ...so that the reference type `&'static T` does not outlive the data it points at
--> $DIR/wf-in-fn-type-static.rs:13:5
|
LL | x: fn() -> &'static T
| ^^^^^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^^^^^ ...so that the reference type `&'static T` does not outlive the data it points at
error[E0310]: the parameter type `T` may not live long enough
--> $DIR/wf-in-fn-type-static.rs:18:5
@ -20,13 +14,7 @@ LL | struct Bar<T> {
| - help: consider adding an explicit lifetime bound...: `T: 'static`
LL | // needs T: Copy
LL | x: fn(&'static T)
| ^^^^^^^^^^^^^^^^^
|
note: ...so that the reference type `&'static T` does not outlive the data it points at
--> $DIR/wf-in-fn-type-static.rs:18:5
|
LL | x: fn(&'static T)
| ^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^ ...so that the reference type `&'static T` does not outlive the data it points at
error: aborting due to 2 previous errors

8
src/test/ui/wf/wf-in-obj-type-static.stderr
View file

@ -5,13 +5,7 @@ LL | struct Foo<T> {
| - help: consider adding an explicit lifetime bound...: `T: 'static`
LL | // needs T: 'static
LL | x: dyn Object<&'static T>
| ^^^^^^^^^^^^^^^^^^^^^^^^^
|
note: ...so that the reference type `&'static T` does not outlive the data it points at
--> $DIR/wf-in-obj-type-static.rs:14:5
|
LL | x: dyn Object<&'static T>
| ^^^^^^^^^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^^^^^^^^^ ...so that the reference type `&'static T` does not outlive the data it points at
error: aborting due to previous error

16
src/test/ui/wf/wf-outlives-ty-in-fn-or-trait.stderr
View file

@ -4,13 +4,7 @@ error[E0309]: the parameter type `T` may not live long enough
LL | impl<'a, T> Trait<'a, T> for usize {
| - help: consider adding an explicit lifetime bound...: `T: 'a`
LL | type Out = &'a fn(T);
| ^^^^^^^^^^^^^^^^^^^^^
|
note: ...so that the reference type `&'a fn(T)` does not outlive the data it points at
--> $DIR/wf-outlives-ty-in-fn-or-trait.rs:9:5
|
LL | type Out = &'a fn(T);
| ^^^^^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^^^^^ ...so that the reference type `&'a fn(T)` does not outlive the data it points at
error[E0309]: the parameter type `T` may not live long enough
--> $DIR/wf-outlives-ty-in-fn-or-trait.rs:19:5
@ -18,13 +12,7 @@ error[E0309]: the parameter type `T` may not live long enough
LL | impl<'a, T> Trait<'a, T> for u32 {
| - help: consider adding an explicit lifetime bound...: `T: 'a`
LL | type Out = &'a dyn Baz<T>;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
|
note: ...so that the reference type `&'a (dyn Baz<T> + 'a)` does not outlive the data it points at
--> $DIR/wf-outlives-ty-in-fn-or-trait.rs:19:5
|
LL | type Out = &'a dyn Baz<T>;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ ...so that the reference type `&'a (dyn Baz<T> + 'a)` does not outlive the data it points at
error: aborting due to 2 previous errors

6
src/test/ui/wf/wf-trait-associated-type-region.stderr
View file

@ -5,11 +5,7 @@ LL | type Type2 = &'a Self::Type1;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: consider adding an explicit lifetime bound `<Self as SomeTrait<'a>>::Type1: 'a`...
note: ...so that the reference type `&'a <Self as SomeTrait<'a>>::Type1` does not outlive the data it points at
--> $DIR/wf-trait-associated-type-region.rs:9:5
|
LL | type Type2 = &'a Self::Type1;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
= note: ...so that the reference type `&'a <Self as SomeTrait<'a>>::Type1` does not outlive the data it points at
error: aborting due to previous error