error: expected one of `:`, `@`, or `|`, found `<` --> $DIR/pat-lt-bracket-2.rs:1:7 | LL | fn a(B<) {} | ^ expected one of `:`, `@`, or `|` | = note: anonymous parameters are removed in the 2018 edition (see RFC 1685) help: if this is a `self` type, give it a parameter name | LL | fn a(self: B<) {} | +++++ help: if this is a type, explicitly ignore the parameter name | LL | fn a(_: B<) {} | ++ error: aborting due to 1 previous error