e6bd6c2044
Always use the `Fn(T) -> R` format when printing closure traits instead of `Fn<(T,), Output = R>`. Fix #67100: ``` error[E0277]: expected a `Fn()` closure, found `F` --> file.rs:6:13 | 6 | call_fn(f) | ------- ^ expected an `Fn()` closure, found `F` | | | required by a bound introduced by this call | = note: wrap the `F` in a closure with no arguments: `|| { /* code */ }` note: required by a bound in `call_fn` --> file.rs:1:15 | 1 | fn call_fn<F: Fn() -> ()>(f: &F) { | ^^^^^^^^^^ required by this bound in `call_fn` help: consider further restricting this bound | 5 | fn call_any<F: std::any::Any + Fn()>(f: &F) { | ++++++ ```
127 lines
4.8 KiB
Plaintext
127 lines
4.8 KiB
Plaintext
error[E0277]: expected a `Fn()` closure, found `unsafe fn() -> i32`
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--> $DIR/fn-trait.rs:20:16
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LL | require_fn(f as unsafe fn() -> i32);
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| ---------- ^^^^^^^^^^^^^^^^^^^^^^^ call the function in a closure: `|| unsafe { /* code */ }`
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| required by a bound introduced by this call
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= help: the trait `Fn()` is not implemented for `unsafe fn() -> i32`
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= note: unsafe function cannot be called generically without an unsafe block
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= note: wrap the `unsafe fn() -> i32` in a closure with no arguments: `|| { /* code */ }`
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note: required by a bound in `require_fn`
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--> $DIR/fn-trait.rs:3:23
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LL | fn require_fn(_: impl Fn() -> i32) {}
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| ^^^^^^^^^^^ required by this bound in `require_fn`
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error[E0271]: type mismatch resolving `<unsafe fn() -> i32 as FnOnce<()>>::Output == i32`
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--> $DIR/fn-trait.rs:20:16
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LL | require_fn(f as unsafe fn() -> i32);
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| ---------- ^^^^^^^^^^^^^^^^^^^^^^^ types differ
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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 `require_fn`
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--> $DIR/fn-trait.rs:3:31
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LL | fn require_fn(_: impl Fn() -> i32) {}
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| ^^^ required by this bound in `require_fn`
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error[E0277]: expected a `Fn()` closure, found `extern "C" fn() -> i32 {g}`
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--> $DIR/fn-trait.rs:23:16
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LL | require_fn(g);
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| ---------- ^ expected an `Fn()` closure, found `extern "C" fn() -> i32 {g}`
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| |
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| required by a bound introduced by this call
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= help: the trait `Fn()` is not implemented for fn item `extern "C" fn() -> i32 {g}`
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= note: wrap the `extern "C" fn() -> i32 {g}` in a closure with no arguments: `|| { /* code */ }`
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note: required by a bound in `require_fn`
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--> $DIR/fn-trait.rs:3:23
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LL | fn require_fn(_: impl Fn() -> i32) {}
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| ^^^^^^^^^^^ required by this bound in `require_fn`
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error[E0271]: type mismatch resolving `<extern "C" fn() -> i32 {g} as FnOnce<()>>::Output == i32`
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--> $DIR/fn-trait.rs:23:16
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LL | require_fn(g);
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| ---------- ^ types differ
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| required by a bound introduced by this call
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note: required by a bound in `require_fn`
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--> $DIR/fn-trait.rs:3:31
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LL | fn require_fn(_: impl Fn() -> i32) {}
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| ^^^ required by this bound in `require_fn`
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error[E0277]: expected a `Fn()` closure, found `extern "C" fn() -> i32`
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--> $DIR/fn-trait.rs:26:16
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LL | require_fn(g as extern "C" fn() -> i32);
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| ---------- ^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected an `Fn()` closure, found `extern "C" fn() -> i32`
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| required by a bound introduced by this call
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= help: the trait `Fn()` is not implemented for `extern "C" fn() -> i32`
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= note: wrap the `extern "C" fn() -> i32` in a closure with no arguments: `|| { /* code */ }`
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note: required by a bound in `require_fn`
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--> $DIR/fn-trait.rs:3:23
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LL | fn require_fn(_: impl Fn() -> i32) {}
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| ^^^^^^^^^^^ required by this bound in `require_fn`
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error[E0271]: type mismatch resolving `<extern "C" fn() -> i32 as FnOnce<()>>::Output == i32`
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--> $DIR/fn-trait.rs:26:16
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LL | require_fn(g as extern "C" fn() -> i32);
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| ---------- ^^^^^^^^^^^^^^^^^^^^^^^^^^^ types differ
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| required by a bound introduced by this call
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note: required by a bound in `require_fn`
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--> $DIR/fn-trait.rs:3:31
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LL | fn require_fn(_: impl Fn() -> i32) {}
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| ^^^ required by this bound in `require_fn`
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error[E0277]: expected a `Fn()` closure, found `unsafe fn() -> i32 {h}`
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--> $DIR/fn-trait.rs:29:16
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LL | require_fn(h);
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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 `Fn()` is not implemented for fn item `unsafe fn() -> i32 {h}`
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= note: unsafe function cannot be called generically without an unsafe block
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= note: wrap the `unsafe fn() -> i32 {h}` in a closure with no arguments: `|| { /* code */ }`
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note: required by a bound in `require_fn`
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--> $DIR/fn-trait.rs:3:23
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LL | fn require_fn(_: impl Fn() -> i32) {}
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| ^^^^^^^^^^^ required by this bound in `require_fn`
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error[E0271]: type mismatch resolving `<unsafe fn() -> i32 {h} as FnOnce<()>>::Output == i32`
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--> $DIR/fn-trait.rs:29:16
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LL | require_fn(h);
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| ---------- ^ types differ
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| required by a bound introduced by this call
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note: required by a bound in `require_fn`
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--> $DIR/fn-trait.rs:3:31
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LL | fn require_fn(_: impl Fn() -> i32) {}
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| ^^^ required by this bound in `require_fn`
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error: aborting due to 8 previous errors
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Some errors have detailed explanations: E0271, E0277.
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For more information about an error, try `rustc --explain E0271`.
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