mirror of https://github.com/rust-lang/rust
57 lines
1.5 KiB
Rust
57 lines
1.5 KiB
Rust
fn foo(x: u32) -> u32 {
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x * 2
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}
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fn bar(x: u32) -> u32 {
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x * 3
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}
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// original example from Issue #102608
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fn foobar(n: u32) -> u32 {
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let g = if n % 2 == 0 { &foo } else { &bar };
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//~^ ERROR `if` and `else` have incompatible types
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//~| different fn items have unique types, even if their signatures are the same
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g(n)
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}
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fn main() {
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assert_eq!(foobar(7), 21);
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assert_eq!(foobar(8), 16);
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// general mismatch of fn item types
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let mut a = foo;
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a = bar;
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//~^ ERROR mismatched types
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//~| expected fn item `fn(_) -> _ {foo}`
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//~| found fn item `fn(_) -> _ {bar}`
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//~| different fn items have unique types, even if their signatures are the same
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// display note even when boxed
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let mut b = Box::new(foo);
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b = Box::new(bar);
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//~^ ERROR mismatched types
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//~| different fn items have unique types, even if their signatures are the same
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// suggest removing reference
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let c: fn(u32) -> u32 = &foo;
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//~^ ERROR mismatched types
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//~| expected fn pointer `fn(_) -> _`
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//~| found reference `&fn(_) -> _ {foo}`
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// suggest using reference
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let d: &fn(u32) -> u32 = foo;
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//~^ ERROR mismatched types
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//~| expected reference `&fn(_) -> _`
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//~| found fn item `fn(_) -> _ {foo}`
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// suggest casting with reference
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let e: &fn(u32) -> u32 = &foo;
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//~^ ERROR mismatched types
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//~| expected reference `&fn(_) -> _`
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//~| found reference `&fn(_) -> _ {foo}`
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// OK
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let mut z: fn(u32) -> u32 = foo as fn(u32) -> u32;
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z = bar;
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}
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