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