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warning: `extern` fn uses type `char`, which is not FFI-safe
--> $DIR/naked-functions-ffi.rs:8:28
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LL | pub extern "C" fn naked(p: char) -> u128 {
| ^^^^ not FFI-safe
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= help: consider using `u32` or `libc::wchar_t` instead
= note: the `char` type has no C equivalent
= note: `#[warn(improper_ctypes_definitions)]` on by default
warning: 1 warning emitted
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