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Rollup merge of #58387 - alexreg:fix-trait-alias-2, r=centril

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Disallow `auto` trait alias syntax

See https://github.com/rust-lang/rust/issues/41517#issuecomment-462567679.

r? @Centril

CC @topecongiro @nikomatsakis
This commit is contained in:
Mazdak Farrokhzad 2019-02-13 04:37:07 +01:00 committed by GitHub
commit a5e869eb62
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3 changed files with 28 additions and 1 deletions
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8
src/libsyntax/parse/parser.rs
View File

@ -6538,8 +6538,14 @@ impl<'a> Parser<'a> {
let bounds = self.parse_generic_bounds()?;
tps.where_clause = self.parse_where_clause()?;
self.expect(&token::Semi)?;
if is_auto == IsAuto::Yes {
let msg = "trait aliases cannot be `auto`";
self.struct_span_err(self.prev_span, msg)
.span_label(self.prev_span, msg)
.emit();
}
if unsafety != Unsafety::Normal {
let msg = "trait aliases cannot be unsafe";
let msg = "trait aliases cannot be `unsafe`";
self.struct_span_err(self.prev_span, msg)
.span_label(self.prev_span, msg)
.emit();

7
src/test/ui/traits/trait-alias-syntax.rs Normal file
View File

@ -0,0 +1,7 @@
#![feature(trait_alias)]
trait Foo {}
auto trait A = Foo; //~ ERROR trait aliases cannot be `auto`
unsafe trait B = Foo; //~ ERROR trait aliases cannot be `unsafe`
fn main() {}

14
src/test/ui/traits/trait-alias-syntax.stderr Normal file
View File

@ -0,0 +1,14 @@
error: trait aliases cannot be `auto`
--> $DIR/trait-alias-syntax.rs:4:19
|
LL | auto trait A = Foo; //~ ERROR trait aliases cannot be `auto`
| ^ trait aliases cannot be `auto`
error: trait aliases cannot be `unsafe`
--> $DIR/trait-alias-syntax.rs:5:21
|
LL | unsafe trait B = Foo; //~ ERROR trait aliases cannot be `unsafe`
| ^ trait aliases cannot be `unsafe`
error: aborting due to 2 previous errors