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warning: `extern` fn uses type `CStr`, which is not FFI-safe
--> $DIR/extern-C-non-FFI-safe-arg-ice-52334.rs:7:12
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LL | type Foo = extern "C" fn(::std::ffi::CStr);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
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= help: consider passing a `*const std::ffi::c_char` instead, and use `CStr::as_ptr()`
= note: `CStr`/`CString` do not have a guaranteed layout
= note: `#[warn(improper_ctypes_definitions)]` on by default
warning: `extern` block uses type `CStr`, which is not FFI-safe
--> $DIR/extern-C-non-FFI-safe-arg-ice-52334.rs:10:18
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LL | fn meh(blah: Foo);
| ^^^ not FFI-safe
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= help: consider passing a `*const std::ffi::c_char` instead, and use `CStr::as_ptr()`
= note: `CStr`/`CString` do not have a guaranteed layout
= note: `#[warn(improper_ctypes)]` on by default
warning: 2 warnings emitted
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