1 error[E0425]: cannot find function `foo` in this scope
2 --> $DIR/issue-4366.rs:28:29
4 LL | fn sub() -> isize { foo(); 1 } //~ ERROR cannot find function `foo` in this scope
5 | ^^^ not found in this scope
6 help: possible candidates are found in other modules, you can import them into scope
13 error: aborting due to previous error
15 For more information about this error, try `rustc --explain E0425`.