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tests: Test that extern "C" fn ptrs lint on slices #130669

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Sep 22, 2024
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tests: Test that extern "C" fn ptrs lint on slices #130669

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9 changes: 9 additions & 0 deletions tests/ui/lint/extern-C-fnptr-lints-slices.rs
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Original file line number Diff line number Diff line change
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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 changes: 16 additions & 0 deletions tests/ui/lint/extern-C-fnptr-lints-slices.stderr
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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

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