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Auto merge of #124388 - compiler-errors:rollup-v17b8fm, r=compiler-errors

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Rollup of 4 pull requests

Successful merges:

 - #124076 (Stablise io_error_downcast)
 - #124378 (Keep the LIB env var in the compiler-builtins test)
 - #124379 (Remove special-casing for `SimplifiedType` for next solver)
 - #124381 (Renamed `DerivedObligation` to `WellFormedDeriveObligation`)

r? `@ghost`
`@rustbot` modify labels: rollup
This commit is contained in:
bors 2024-04-26 00:10:56 +00:00
commit e59f2c544a
9 changed files with 34 additions and 73 deletions
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9
compiler/rustc_middle/src/traits/mod.rs
View File

@ -328,11 +328,16 @@ pub enum ObligationCauseCode<'tcx> {
/// `static` items must have `Sync` type.
SharedStatic,
/// Derived obligation (i.e. theoretical `where` clause) on a built-in
/// implementation like `Copy` or `Sized`.
BuiltinDerivedObligation(DerivedObligationCause<'tcx>),
/// Derived obligation (i.e. `where` clause) on an user-provided impl
/// or a trait alias.
ImplDerivedObligation(Box<ImplDerivedObligationCause<'tcx>>),
DerivedObligation(DerivedObligationCause<'tcx>),
/// Derived obligation for WF goals.
WellFormedDerivedObligation(DerivedObligationCause<'tcx>),
FunctionArgumentObligation {
/// The node of the relevant argument in the function call.
@ -534,7 +539,7 @@ pub fn parent(&self) -> Option<(&Self, Option<ty::PolyTraitPredicate<'tcx>>)> {
match self {
FunctionArgumentObligation { parent_code, .. } => Some((parent_code, None)),
BuiltinDerivedObligation(derived)
| DerivedObligation(derived)
| WellFormedDerivedObligation(derived)
| ImplDerivedObligation(box ImplDerivedObligationCause { derived, .. }) => {
Some((&derived.parent_code, Some(derived.parent_trait_pred)))
}

38
compiler/rustc_middle/src/ty/fast_reject.rs
View File

@ -58,30 +58,6 @@ pub enum TreatParams {
/// This also treats projections with inference variables as infer vars
/// since they could be further normalized.
ForLookup,
/// Treat parameters as placeholders in the given environment. This is the
/// correct mode for *lookup*, as during candidate selection.
///
/// N.B. during deep rejection, this acts identically to `ForLookup`.
///
/// FIXME(-Znext-solver): Remove this variant and cleanup
/// the code.
NextSolverLookup,
}
/// During fast-rejection, we have the choice of treating projection types
/// as either simplifiable or not, depending on whether we expect the projection
/// to be normalized/rigid.
#[derive(PartialEq, Eq, Debug, Clone, Copy)]
pub enum TreatProjections {
/// In the old solver we don't try to normalize projections
/// when looking up impls and only access them by using the
/// current self type. This means that if the self type is
/// a projection which could later be normalized, we must not
/// treat it as rigid.
ForLookup,
/// We can treat projections in the self type as opaque as
/// we separately look up impls for the normalized self type.
NextSolverLookup,
}
/// Tries to simplify a type by only returning the outermost injective¹ layer, if one exists.
@ -139,21 +115,17 @@ pub fn simplify_type<'tcx>(
ty::FnPtr(f) => Some(SimplifiedType::Function(f.skip_binder().inputs().len())),
ty::Placeholder(..) => Some(SimplifiedType::Placeholder),
ty::Param(_) => match treat_params {
TreatParams::ForLookup | TreatParams::NextSolverLookup => {
Some(SimplifiedType::Placeholder)
}
TreatParams::ForLookup => Some(SimplifiedType::Placeholder),
TreatParams::AsCandidateKey => None,
},
ty::Alias(..) => match treat_params {
// When treating `ty::Param` as a placeholder, projections also
// don't unify with anything else as long as they are fully normalized.
//
// We will have to be careful with lazy normalization here.
// FIXME(lazy_normalization): This is probably not right...
// FIXME(-Znext-solver): Can remove this `if` and always simplify to `Placeholder`
// when the new solver is enabled by default.
TreatParams::ForLookup if !ty.has_non_region_infer() => {
Some(SimplifiedType::Placeholder)
}
TreatParams::NextSolverLookup => Some(SimplifiedType::Placeholder),
TreatParams::ForLookup | TreatParams::AsCandidateKey => None,
},
ty::Foreign(def_id) => Some(SimplifiedType::Foreign(def_id)),
@ -331,7 +303,7 @@ pub fn types_may_unify<'tcx>(self, obligation_ty: Ty<'tcx>, impl_ty: Ty<'tcx>) -
// Depending on the value of `treat_obligation_params`, we either
// treat generic parameters like placeholders or like inference variables.
ty::Param(_) => match self.treat_obligation_params {
TreatParams::ForLookup | TreatParams::NextSolverLookup => false,
TreatParams::ForLookup => false,
TreatParams::AsCandidateKey => true,
},
@ -373,7 +345,7 @@ pub fn consts_may_unify(self, obligation_ct: ty::Const<'_>, impl_ct: ty::Const<'
let k = impl_ct.kind();
match obligation_ct.kind() {
ty::ConstKind::Param(_) => match self.treat_obligation_params {
TreatParams::ForLookup | TreatParams::NextSolverLookup => false,
TreatParams::ForLookup => false,
TreatParams::AsCandidateKey => true,
},

27
compiler/rustc_middle/src/ty/trait_def.rs
View File

@ -1,5 +1,5 @@
use crate::traits::specialization_graph;
use crate::ty::fast_reject::{self, SimplifiedType, TreatParams, TreatProjections};
use crate::ty::fast_reject::{self, SimplifiedType, TreatParams};
use crate::ty::{Ident, Ty, TyCtxt};
use hir::def_id::LOCAL_CRATE;
use rustc_hir as hir;
@ -135,21 +135,6 @@ pub fn for_each_relevant_impl(
self,
trait_def_id: DefId,
self_ty: Ty<'tcx>,
f: impl FnMut(DefId),
) {
self.for_each_relevant_impl_treating_projections(
trait_def_id,
self_ty,
TreatProjections::ForLookup,
f,
)
}
pub fn for_each_relevant_impl_treating_projections(
self,
trait_def_id: DefId,
self_ty: Ty<'tcx>,
treat_projections: TreatProjections,
mut f: impl FnMut(DefId),
) {
// FIXME: This depends on the set of all impls for the trait. That is
@ -163,17 +148,13 @@ pub fn for_each_relevant_impl_treating_projections(
f(impl_def_id);
}
// Note that we're using `TreatParams::ForLookup` to query `non_blanket_impls` while using
// `TreatParams::AsCandidateKey` while actually adding them.
let treat_params = match treat_projections {
TreatProjections::NextSolverLookup => TreatParams::NextSolverLookup,
TreatProjections::ForLookup => TreatParams::ForLookup,
};
// This way, when searching for some impl for `T: Trait`, we do not look at any impls
// whose outer level is not a parameter or projection. Especially for things like
// `T: Clone` this is incredibly useful as we would otherwise look at all the impls
// of `Clone` for `Option<T>`, `Vec<T>`, `ConcreteType` and so on.
if let Some(simp) = fast_reject::simplify_type(self, self_ty, treat_params) {
// Note that we're using `TreatParams::ForLookup` to query `non_blanket_impls` while using
// `TreatParams::AsCandidateKey` while actually adding them.
if let Some(simp) = fast_reject::simplify_type(self, self_ty, TreatParams::ForLookup) {
if let Some(impls) = impls.non_blanket_impls.get(&simp) {
for &impl_def_id in impls {
f(impl_def_id);

16
compiler/rustc_trait_selection/src/solve/trait_goals.rs
View File

@ -14,7 +14,7 @@
CandidateSource, CanonicalResponse, Certainty, Goal, QueryResult,
};
use rustc_middle::traits::{BuiltinImplSource, Reveal};
use rustc_middle::ty::fast_reject::{DeepRejectCtxt, TreatParams, TreatProjections};
use rustc_middle::ty::fast_reject::{DeepRejectCtxt, TreatParams};
use rustc_middle::ty::{self, ToPredicate, Ty, TyCtxt};
use rustc_middle::ty::{TraitPredicate, TypeVisitableExt};
use rustc_span::{ErrorGuaranteed, DUMMY_SP};
@ -1045,6 +1045,12 @@ fn disqualify_auto_trait_candidate_due_to_possible_impl(
}
}
// If we still have an alias here, it must be rigid. For opaques, it's always
// okay to consider auto traits because that'll reveal its hidden type. For
// non-opaque aliases, we will not assemble any candidates since there's no way
// to further look into its type.
ty::Alias(..) => None,
// For rigid types, any possible implementation that could apply to
// the type (even if after unification and processing nested goals
// it does not hold) will disqualify the built-in auto impl.
@ -1072,15 +1078,11 @@ fn disqualify_auto_trait_candidate_due_to_possible_impl(
| ty::CoroutineWitness(..)
| ty::Never
| ty::Tuple(_)
| ty::Adt(_, _)
// FIXME: Handling opaques here is kinda sus. Especially because we
// simplify them to SimplifiedType::Placeholder.
| ty::Alias(ty::Opaque, _) => {
| ty::Adt(_, _) => {
let mut disqualifying_impl = None;
self.tcx().for_each_relevant_impl_treating_projections(
self.tcx().for_each_relevant_impl(
goal.predicate.def_id(),
goal.predicate.self_ty(),
TreatProjections::NextSolverLookup,
|impl_def_id| {
disqualifying_impl = Some(impl_def_id);
},

2
compiler/rustc_trait_selection/src/traits/error_reporting/on_unimplemented.rs
View File

@ -128,7 +128,7 @@ fn on_unimplemented_note(
match obligation.cause.code() {
ObligationCauseCode::BuiltinDerivedObligation(..)
| ObligationCauseCode::ImplDerivedObligation(..)
| ObligationCauseCode::DerivedObligation(..) => {}
| ObligationCauseCode::WellFormedDerivedObligation(..) => {}
_ => {
// this is a "direct", user-specified, rather than derived,
// obligation.

4
compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
View File

@ -2294,7 +2294,7 @@ fn maybe_note_obligation_cause_for_async_await<G: EmissionGuarantee>(
next_code = Some(&cause.derived.parent_code);
}
ObligationCauseCode::DerivedObligation(derived_obligation)
ObligationCauseCode::WellFormedDerivedObligation(derived_obligation)
| ObligationCauseCode::BuiltinDerivedObligation(derived_obligation) => {
let ty = derived_obligation.parent_trait_pred.skip_binder().self_ty();
debug!(
@ -3423,7 +3423,7 @@ fn note_obligation_cause_code<G: EmissionGuarantee, T>(
)
});
}
ObligationCauseCode::DerivedObligation(ref data) => {
ObligationCauseCode::WellFormedDerivedObligation(ref data) => {
let parent_trait_ref = self.resolve_vars_if_possible(data.parent_trait_pred);
let parent_predicate = parent_trait_ref;
// #74711: avoid a stack overflow

2
compiler/rustc_trait_selection/src/traits/wf.rs
View File

@ -381,7 +381,7 @@ fn compute_trait_pred(&mut self, trait_pred: ty::TraitPredicate<'tcx>, elaborate
if let Some(parent_trait_pred) = predicate.to_opt_poly_trait_pred() {
cause = cause.derived_cause(
parent_trait_pred,
traits::ObligationCauseCode::DerivedObligation,
traits::ObligationCauseCode::WellFormedDerivedObligation,
);
}
extend_cause_with_original_assoc_item_obligation(tcx, item, &mut cause, predicate);

4
library/std/src/io/error.rs
View File

@ -869,8 +869,6 @@ pub fn into_inner(self) -> Option<Box<dyn error::Error + Send + Sync>> {
/// # Examples
///
/// ```
/// #![feature(io_error_downcast)]
///
/// use std::fmt;
/// use std::io;
/// use std::error::Error;
@ -923,7 +921,7 @@ pub fn into_inner(self) -> Option<Box<dyn error::Error + Send + Sync>> {
/// assert!(io_error.raw_os_error().is_none());
/// # }
/// ```
#[unstable(feature = "io_error_downcast", issue = "99262")]
#[stable(feature = "io_error_downcast", since = "CURRENT_RUSTC_VERSION")]
pub fn downcast<E>(self) -> result::Result<E, Self>
where
E: error::Error + Send + Sync + 'static,

5
tests/run-make/compiler-builtins/rmake.rs
View File

@ -63,7 +63,10 @@ fn main() {
.env("RUSTC", rustc)
.env("RUSTFLAGS", "-Copt-level=0 -Cdebug-assertions=yes")
.env("CARGO_TARGET_DIR", &target_dir)
.env("RUSTC_BOOTSTRAP", "1");
.env("RUSTC_BOOTSTRAP", "1")
// Visual Studio 2022 requires that the LIB env var be set so it can
// find the Windows SDK.
.env("LIB", std::env::var("LIB").unwrap_or_default());
set_host_rpath(&mut cmd);
let status = cmd.status().unwrap();