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|
error[E0631]: type mismatch in function arguments
--> $DIR/suggest-option-asderef-unfixable.rs:24:40
|
LL | fn takes_str_but_too_many_refs(_: &&str) -> Option<()> {
| ------------------------------------------------------ found signature defined here
...
LL | let _ = produces_string().and_then(takes_str_but_too_many_refs);
| -------- ^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected due to this
| |
| required by a bound introduced by this call
|
= note: expected function signature `fn(String) -> _`
found function signature `fn(&&str) -> _`
note: required by a bound in `Option::<T>::and_then`
--> $SRC_DIR/core/src/option.rs:LL:COL
help: consider wrapping the function in a closure
|
LL | let _ = produces_string().and_then(|arg0: String| takes_str_but_too_many_refs(/* &&str */));
| ++++++++++++++ +++++++++++++
error[E0277]: expected a `FnOnce(String)` closure, found `for<'a> extern "C" fn(&'a str) -> Option<()> {takes_str_but_wrong_abi}`
--> $DIR/suggest-option-asderef-unfixable.rs:26:40
|
LL | let _ = produces_string().and_then(takes_str_but_wrong_abi);
| -------- ^^^^^^^^^^^^^^^^^^^^^^^ expected an `FnOnce(String)` closure, found `for<'a> extern "C" fn(&'a str) -> Option<()> {takes_str_but_wrong_abi}`
| |
| required by a bound introduced by this call
|
= help: the trait `FnOnce(String)` is not implemented for fn item `for<'a> extern "C" fn(&'a str) -> Option<()> {takes_str_but_wrong_abi}`
note: required by a bound in `Option::<T>::and_then`
--> $SRC_DIR/core/src/option.rs:LL:COL
error[E0277]: expected a `FnOnce(String)` closure, found `for<'a> unsafe fn(&'a str) -> Option<()> {takes_str_but_unsafe}`
--> $DIR/suggest-option-asderef-unfixable.rs:28:40
|
LL | let _ = produces_string().and_then(takes_str_but_unsafe);
| -------- ^^^^^^^^^^^^^^^^^^^^ call the function in a closure: `|| unsafe { /* code */ }`
| |
| required by a bound introduced by this call
|
= help: the trait `FnOnce(String)` is not implemented for fn item `for<'a> unsafe fn(&'a str) -> Option<()> {takes_str_but_unsafe}`
= note: unsafe function cannot be called generically without an unsafe block
note: required by a bound in `Option::<T>::and_then`
--> $SRC_DIR/core/src/option.rs:LL:COL
error[E0593]: function is expected to take 1 argument, but it takes 0 arguments
--> $DIR/suggest-option-asderef-unfixable.rs:30:40
|
LL | fn no_args() -> Option<()> {
| -------------------------- takes 0 arguments
...
LL | let _ = produces_string().and_then(no_args);
| -------- ^^^^^^^ expected function that takes 1 argument
| |
| required by a bound introduced by this call
|
note: required by a bound in `Option::<T>::and_then`
--> $SRC_DIR/core/src/option.rs:LL:COL
error[E0631]: type mismatch in function arguments
--> $DIR/suggest-option-asderef-unfixable.rs:32:45
|
LL | fn takes_str_but_too_many_refs(_: &&str) -> Option<()> {
| ------------------------------------------------------ found signature defined here
...
LL | let _ = Some(TypeWithoutDeref).and_then(takes_str_but_too_many_refs);
| -------- ^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected due to this
| |
| required by a bound introduced by this call
|
= note: expected function signature `fn(TypeWithoutDeref) -> _`
found function signature `fn(&&str) -> _`
note: required by a bound in `Option::<T>::and_then`
--> $SRC_DIR/core/src/option.rs:LL:COL
help: consider wrapping the function in a closure
|
LL | let _ = Some(TypeWithoutDeref).and_then(|arg0: TypeWithoutDeref| takes_str_but_too_many_refs(/* &&str */));
| ++++++++++++++++++++++++ +++++++++++++
error: aborting due to 5 previous errors
Some errors have detailed explanations: E0277, E0593, E0631.
For more information about an error, try `rustc --explain E0277`.
|
