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Deprecate custom_derive

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Has a custom deprecation since deprecating features is not supported and is a pain to implement
This commit is contained in:
Nick Cameron 2016-10-11 17:19:51 +13:00
parent d1b08b136c
commit b7675cf04a
2 changed files with 7 additions and 1 deletions
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7
src/libsyntax/feature_gate.rs
View file

@ -897,7 +897,12 @@ pub fn feature_err<'a>(sess: &'a ParseSess, feature: &str, span: Span, issue: Ga
"allow_internal_unstable side-steps feature gating and stability checks";
pub const EXPLAIN_CUSTOM_DERIVE: &'static str =
"`#[derive]` for custom traits is not stable enough for use and is subject to change";
"`#[derive]` for custom traits is not stable enough for use. It is deprecated and will \
be removed in v1.15";
pub const EXPLAIN_DEPR_CUSTOM_DERIVE: &'static str =
"`#[derive]` for custom traits is deprecated and will be removed in v1.15. Prefer using \
procedural macro custom derive";
pub const EXPLAIN_DERIVE_UNDERSCORE: &'static str =
"attributes of the form `#[derive_*]` are reserved for the compiler";

1
src/libsyntax_ext/deriving/mod.rs
View file

@ -175,6 +175,7 @@ pub fn expand_derive(cx: &mut ExtCtxt,
feature_gate::GateIssue::Language,
feature_gate::EXPLAIN_CUSTOM_DERIVE);
} else {
cx.span_warn(titem.span, EXPLAIN_DEPR_CUSTOM_DERIVE);
let name = intern_and_get_ident(&format!("derive_{}", tname));
let mitem = cx.meta_word(titem.span, name);
new_attributes.push(cx.attribute(mitem.span, mitem));