bjoernager/rust
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pre-expansion gate associated_type_bounds

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This commit is contained in:
Mazdak Farrokhzad 2019-09-21 18:05:26 +02:00
parent 2d182b82ce
commit c17a1fd7d0
5 changed files with 28 additions and 17 deletions
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12
src/libsyntax/parse/parser/path.rs
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@ -404,8 +404,9 @@ impl<'a> Parser<'a> {
// Parse lifetime argument.
args.push(GenericArg::Lifetime(self.expect_lifetime()));
misplaced_assoc_ty_constraints.append(&mut assoc_ty_constraints);
} else if self.check_ident() && self.look_ahead(1,
|t| t == &token::Eq || t == &token::Colon) {
} else if self.check_ident()
&& self.look_ahead(1, |t| t == &token::Eq || t == &token::Colon)
{
// Parse associated type constraint.
let lo = self.token.span;
let ident = self.parse_ident()?;
@ -420,7 +421,14 @@ impl<'a> Parser<'a> {
} else {
unreachable!();
};
let span = lo.to(self.prev_span);
// Gate associated type bounds, e.g., `Iterator<Item: Ord>`.
if let AssocTyConstraintKind::Bound { .. } = kind {
self.sess.gated_spans.associated_type_bounds.borrow_mut().push(span);
}
constraints.push(AssocTyConstraint {
id: ast::DUMMY_NODE_ID,
ident,