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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:50 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:50 +0000 |
commit | 2e00214b3efbdfeefaa0fe9e8b8fd519de7adc35 (patch) | |
tree | d325add32978dbdc1db975a438b3a77d571b1ab8 /tests/ui/fn/fn-pointer-mismatch.rs | |
parent | Releasing progress-linux version 1.68.2+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-2e00214b3efbdfeefaa0fe9e8b8fd519de7adc35.tar.xz rustc-2e00214b3efbdfeefaa0fe9e8b8fd519de7adc35.zip |
Merging upstream version 1.69.0+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/fn/fn-pointer-mismatch.rs')
-rw-r--r-- | tests/ui/fn/fn-pointer-mismatch.rs | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/tests/ui/fn/fn-pointer-mismatch.rs b/tests/ui/fn/fn-pointer-mismatch.rs new file mode 100644 index 000000000..0597478cb --- /dev/null +++ b/tests/ui/fn/fn-pointer-mismatch.rs @@ -0,0 +1,56 @@ +fn foo(x: u32) -> u32 { + x * 2 +} + +fn bar(x: u32) -> u32 { + x * 3 +} + +// original example from Issue #102608 +fn foobar(n: u32) -> u32 { + let g = if n % 2 == 0 { &foo } else { &bar }; + //~^ ERROR `if` and `else` have incompatible types + //~| different fn items have unique types, even if their signatures are the same + g(n) +} + +fn main() { + assert_eq!(foobar(7), 21); + assert_eq!(foobar(8), 16); + + // general mismatch of fn item types + let mut a = foo; + a = bar; + //~^ ERROR mismatched types + //~| expected fn item `fn(_) -> _ {foo}` + //~| found fn item `fn(_) -> _ {bar}` + //~| different fn items have unique types, even if their signatures are the same + + // display note even when boxed + let mut b = Box::new(foo); + b = Box::new(bar); + //~^ ERROR mismatched types + //~| different fn items have unique types, even if their signatures are the same + + // suggest removing reference + let c: fn(u32) -> u32 = &foo; + //~^ ERROR mismatched types + //~| expected fn pointer `fn(u32) -> u32` + //~| found reference `&fn(u32) -> u32 {foo}` + + // suggest using reference + let d: &fn(u32) -> u32 = foo; + //~^ ERROR mismatched types + //~| expected reference `&fn(u32) -> u32` + //~| found fn item `fn(u32) -> u32 {foo}` + + // suggest casting with reference + let e: &fn(u32) -> u32 = &foo; + //~^ ERROR mismatched types + //~| expected reference `&fn(u32) -> u32` + //~| found reference `&fn(u32) -> u32 {foo}` + + // OK + let mut z: fn(u32) -> u32 = foo as fn(u32) -> u32; + z = bar; +} |