error: expected one of `:`, `@`, or `|`, found `}`
  --> $DIR/issue-44021.rs:13:18
   |
LL |     fn f() {|x, y} //~ ERROR expected one of `:`, `@`, or `|`, found `}`
   |                  ^ expected one of `:`, `@`, or `|` here

error: aborting due to previous error