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error[E0631]: type mismatch in function arguments
--> $DIR/suggest-option-asderef-inference-var.rs:7:56
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LL | fn deref_int(a: &i32) -> i32 {
| ---------------------------- found signature defined here
...
LL | let _has_inference_vars: Option<i32> = Some(0).map(deref_int);
| --- ^^^^^^^^^ expected due to this
| |
| required by a bound introduced by this call
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= note: expected function signature `fn({integer}) -> _`
found function signature `for<'a> fn(&'a i32) -> _`
note: required by a bound in `Option::<T>::map`
--> $SRC_DIR/core/src/option.rs:LL:COL
help: do not borrow the argument
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LL - fn deref_int(a: &i32) -> i32 {
LL + fn deref_int(a: i32) -> i32 {
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error: aborting due to previous error
For more information about this error, try `rustc --explain E0631`.
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