1 error[E0061]: this function takes 2 arguments but 1 argument was supplied
2 --> $DIR/issue-18819.rs:16:5
5 | ^^^^^^^ - supplied 1 argument
9 note: function defined here
10 --> $DIR/issue-18819.rs:11:4
12 LL | fn print_x(_: &dyn Foo<Item=bool>, extra: &str) {
13 | ^^^^^^^ ---------------------- -----------
15 error: aborting due to previous error
17 For more information about this error, try `rustc --explain E0061`.