| 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`. |