Disallow auto
trait alias syntax.
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1 changed files with 7 additions and 1 deletions
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@ -6534,8 +6534,14 @@ impl<'a> Parser<'a> {
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let bounds = self.parse_generic_bounds()?;
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tps.where_clause = self.parse_where_clause()?;
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self.expect(&token::Semi)?;
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if is_auto == IsAuto::Yes {
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let msg = "trait aliases cannot be `auto`";
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self.struct_span_err(self.prev_span, msg)
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.span_label(self.prev_span, msg)
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.emit();
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}
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if unsafety != Unsafety::Normal {
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let msg = "trait aliases cannot be unsafe";
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let msg = "trait aliases cannot be `unsafe`";
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self.struct_span_err(self.prev_span, msg)
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.span_label(self.prev_span, msg)
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.emit();
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