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Rollup merge of #130669 - workingjubilee:slicing-fnptr-tests-finely, r=compiler-errors

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tests: Test that `extern "C" fn` ptrs lint on slices

This seems to have slipped past the `improper_ctypes_definitions` lint at some point. I found similar tests but not one with this exact combination, so test the semi-unique combination.
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9
tests/ui/lint/extern-C-fnptr-lints-slices.rs Normal file
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#[deny(improper_ctypes_definitions)]
// It's an improper ctype (a slice) arg in an extern "C" fnptr.
pub type F = extern "C" fn(&[u8]);
//~^ ERROR: `extern` fn uses type `[u8]`, which is not FFI-safe
fn main() {}

16
tests/ui/lint/extern-C-fnptr-lints-slices.stderr Normal file
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error: `extern` fn uses type `[u8]`, which is not FFI-safe
--> $DIR/extern-C-fnptr-lints-slices.rs:5:14
|
LL | pub type F = extern "C" fn(&[u8]);
| ^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
= help: consider using a raw pointer instead
= note: slices have no C equivalent
note: the lint level is defined here
--> $DIR/extern-C-fnptr-lints-slices.rs:1:8
|
LL | #[deny(improper_ctypes_definitions)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to 1 previous error