Allow placeholder parameters in trait fn defs
@@ -79,7 +79,7 @@ fn value_parameter(p: &mut Parser, flavor: Flavor) {
let la1 = p.nth(1);
let la2 = p.nth(2);
let la3 = p.nth(3);
- if la0 == IDENT && la1 == COLON
+ if (la0 == IDENT || la0 == UNDERSCORE) && la1 == COLON
|| la0 == AMP && la1 == IDENT && la2 == COLON
|| la0 == AMP && la1 == MUT_KW && la2 == IDENT && la3 == COLON
{
