bjoernager/rust
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Create new E0774 code error

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This commit is contained in:
Guillaume Gomez 2020-09-05 14:55:08 +02:00
parent 02fe30971e
commit e0df2f87b6
3 changed files with 31 additions and 3 deletions
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9
compiler/rustc_expand/src/expand.rs
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@ -529,9 +529,12 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
fn error_derive_forbidden_on_non_adt(&self, derives: &[Path], item: &Annotatable) {
let attr = self.cx.sess.find_by_name(item.attrs(), sym::derive);
let span = attr.map_or(item.span(), |attr| attr.span);
let mut err = self
.cx
.struct_span_err(span, "`derive` may only be applied to structs, enums and unions");
let mut err = rustc_errors::struct_span_err!(
self.cx.sess,
span,
E0774,
"`derive` may only be applied to structs, enums and unions",
);
if let Some(ast::Attribute { style: ast::AttrStyle::Inner, .. }) = attr {
let trait_list = derives.iter().map(|t| pprust::path_to_string(t)).collect::<Vec<_>>();
let suggestion = format!("#[derive({})]", trait_list.join(", "));