1 error[E0061]: this function takes 2 parameters but 1 parameter was supplied
2 --> $DIR/issue-18819.rs:26:5
4 LL | fn print_x(_: &Foo<Item=bool>, extra: &str) {
5 | ------------------------------------------- defined here
8 | ^^^^^^^^^^ expected 2 parameters
10 error: aborting due to previous error
12 For more information about this error, try `rustc --explain E0061`.