269         if input.peek(token::Group) {  in ambig_ty()
275         if lookahead.peek(Token![for]) {  in ambig_ty()
278             if !lookahead.peek(Ident)  in ambig_ty()
279                 && !lookahead.peek(Token![fn])  in ambig_ty()
280                 && !lookahead.peek(Token![unsafe])  in ambig_ty()
281                 && !lookahead.peek(Token![extern])  in ambig_ty()
282                 && !lookahead.peek(Token![super])  in ambig_ty()
283                 && !lookahead.peek(Token![self])  in ambig_ty()
284                 && !lookahead.peek(Token![Self])  in ambig_ty()
285                 && !lookahead.peek(Token![crate])  in ambig_ty()
291         if lookahead.peek(token::Paren) {  in ambig_ty()
300             if content.peek(Lifetime) {  in ambig_ty()
306             if content.peek(Token![?]) {  in ambig_ty()
324             if content.peek(Token![,]) {  in ambig_ty()
338             if allow_plus && input.peek(Token![+]) {  in ambig_ty()
391         } else if lookahead.peek(Token![fn])  in ambig_ty()
392             || lookahead.peek(Token![unsafe])  in ambig_ty()
393             || lookahead.peek(Token![extern]) && !input.peek2(Token![::])  in ambig_ty()
398         } else if lookahead.peek(Ident)  in ambig_ty()
399             || input.peek(Token![super])  in ambig_ty()
400             || input.peek(Token![self])  in ambig_ty()
401             || input.peek(Token![Self])  in ambig_ty()
402             || input.peek(Token![crate])  in ambig_ty()
403             || input.peek(Token![extern])  in ambig_ty()
404             || lookahead.peek(Token![::])  in ambig_ty()
405             || lookahead.peek(Token![<])  in ambig_ty()
407             if input.peek(Token![dyn]) {  in ambig_ty()
425             if input.peek(Token![!]) && !input.peek(Token![!=]) {  in ambig_ty()
450             if lifetimes.is_some() || allow_plus && input.peek(Token![+]) {  in ambig_ty()
459                     while input.peek(Token![+]) {  in ambig_ty()
461                         if input.peek(Token![>]) {  in ambig_ty()
474         } else if lookahead.peek(token::Bracket) {  in ambig_ty()
478             if content.peek(Token![;]) {  in ambig_ty()
491         } else if lookahead.peek(Token![*]) {  in ambig_ty()
493         } else if lookahead.peek(Token![&]) {  in ambig_ty()
495         } else if lookahead.peek(Token![!]) && !input.peek(Token![=]) {  in ambig_ty()
497         } else if lookahead.peek(Token![impl]) {  in ambig_ty()
499         } else if lookahead.peek(Token![_]) {  in ambig_ty()
501         } else if lookahead.peek(Lifetime) {  in ambig_ty()
535             let (const_token, mutability) = if lookahead.peek(Token![const]) {  in parse()
537             } else if lookahead.peek(Token![mut]) {  in parse()
576                     while !args.is_empty() && !args.peek(Token![...]) {  in parse()
587                     if allow_variadic && args.peek(Token![...]) {  in parse()
637                 && input.peek(token::Paren)  in parse()
657             if input.peek(Token![->]) {  in parse()
702                             if !input.peek(Token![+]) {  in parse()
706                             if input.peek(Token![>]) {  in parse()
733                         if !input.peek(Token![+]) {  in parse()
774                     if (input.peek(Ident) || input.peek(Token![_]))  in parse()
793             if lookahead.peek(Ident) {  in parse()
795             } else if lookahead.peek(Token![_]) {  in parse()
814             if input.peek(Token![extern]) {  in parse()