bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

Check that #[rustc_must_implement_one_of] is applied to a trait

Browse source
This commit is contained in:
Maybe Waffle 2022-01-27 21:25:51 +03:00
parent a7f375789b
commit 4ca56d2888
3 changed files with 50 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

23
compiler/rustc_passes/src/check_attr.rs
View file

@ -76,6 +76,9 @@ impl CheckAttrVisitor<'_> {
sym::inline => self.check_inline(hir_id, attr, span, target),
sym::non_exhaustive => self.check_non_exhaustive(hir_id, attr, span, target),
sym::marker => self.check_marker(hir_id, attr, span, target),
sym::rustc_must_implement_one_of => {
self.check_rustc_must_implement_one_of(attr, span, target)
}
sym::target_feature => self.check_target_feature(hir_id, attr, span, target),
sym::track_caller => {
self.check_track_caller(hir_id, &attr.span, attrs, span, target)
@ -477,6 +480,26 @@ impl CheckAttrVisitor<'_> {
}
}
/// Checks if the `#[rustc_must_implement_one_of]` attribute on a `target` is valid. Returns `true` if valid.
fn check_rustc_must_implement_one_of(
&self,
attr: &Attribute,
span: &Span,
target: Target,
) -> bool {
match target {
Target::Trait => true,
_ => {
self.tcx
.sess
.struct_span_err(attr.span, "attribute can only be applied to a trait")
.span_label(*span, "not a trait")
.emit();
false
}
}
}
/// Checks if the `#[target_feature]` attribute on `item` is valid. Returns `true` if valid.
fn check_target_feature(
&self,