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error[E0631]: type mismatch in function arguments
--> $DIR/fn-variance-1.rs:11:15
|
LL | fn takes_mut(x: &mut isize) { }
| --------------------------- found signature defined here
...
LL | apply(&3, takes_mut);
| ----- ^^^^^^^^^ expected due to this
| |
| required by a bound introduced by this call
|
= note: expected function signature `fn(&{integer}) -> _`
found function signature `for<'a> fn(&'a mut isize) -> _`
note: required by a bound in `apply`
--> $DIR/fn-variance-1.rs:5:37
|
LL | fn apply<T, F>(t: T, f: F) where F: FnOnce(T) {
| ^^^^^^^^^ required by this bound in `apply`
error[E0631]: type mismatch in function arguments
--> $DIR/fn-variance-1.rs:15:19
|
LL | fn takes_imm(x: &isize) { }
| ----------------------- found signature defined here
...
LL | apply(&mut 3, takes_imm);
| ----- ^^^^^^^^^ expected due to this
| |
| required by a bound introduced by this call
|
= note: expected function signature `fn(&mut {integer}) -> _`
found function signature `for<'a> fn(&'a isize) -> _`
note: required by a bound in `apply`
--> $DIR/fn-variance-1.rs:5:37
|
LL | fn apply<T, F>(t: T, f: F) where F: FnOnce(T) {
| ^^^^^^^^^ required by this bound in `apply`
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0631`.
|
