33 lines
1.0 KiB
Rust
33 lines
1.0 KiB
Rust
// compile-flags: -Znext-solver
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fn require_fn(_: impl Fn() -> i32) {}
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fn f() -> i32 {
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1i32
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}
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extern "C" fn g() -> i32 {
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2i32
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}
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unsafe fn h() -> i32 {
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2i32
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}
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fn main() {
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require_fn(f);
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require_fn(f as fn() -> i32);
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require_fn(f as unsafe fn() -> i32);
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//~^ ERROR: expected a `Fn()` closure, found `unsafe fn() -> i32`
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//~| ERROR: type mismatch resolving `<unsafe fn() -> i32 as FnOnce<()>>::Output == i32`
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require_fn(g);
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//~^ ERROR: expected a `Fn()` closure, found `extern "C" fn() -> i32 {g}`
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//~| ERROR: type mismatch resolving `<extern "C" fn() -> i32 {g} as FnOnce<()>>::Output == i32`
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require_fn(g as extern "C" fn() -> i32);
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//~^ ERROR: expected a `Fn()` closure, found `extern "C" fn() -> i32`
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//~| ERROR: type mismatch resolving `<extern "C" fn() -> i32 as FnOnce<()>>::Output == i32`
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require_fn(h);
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//~^ ERROR: expected a `Fn()` closure, found `unsafe fn() -> i32 {h}`
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//~| ERROR: type mismatch resolving `<unsafe fn() -> i32 {h} as FnOnce<()>>::Output == i32`
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}
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