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Disallow auto trait alias syntax.
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Alexander Regueiro committed Feb 12, 2019
1 parent 57d7cfc commit aafbf74
Showing 1 changed file with 7 additions and 1 deletion.
8 changes: 7 additions & 1 deletion src/libsyntax/parse/parser.rs
Expand Up @@ -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();
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