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Disallow auto trait alias syntax.

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This commit is contained in:
Alexander Regueiro 2019-02-12 01:50:33 +00:00
parent 57d7cfc3cf
commit aafbf742c2
1 changed files with 7 additions and 1 deletions
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8
src/libsyntax/parse/parser.rs
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@ -6534,8 +6534,14 @@ 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();