src/test/ui/parser/issue-22647.stderr

error: expected one of `:`, `;`, `=`, `@`, or `|`, found `<`
  --> $DIR/issue-22647.rs:2:15
   |
LL |     let caller<F> = |f: F|
   |               ^ expected one of `:`, `;`, `=`, `@`, or `|`

error: aborting due to previous error