must_use_type not working on type aliases

[matejcik]

The #[must_use] attribute does not apply to type aliases, so it makes sense that bindgen won't put it on the alias itself.

However, it would be nice if it would put it on the functions returning the given type alias instead.

Input C/C++ Header

#include <stdint.h>

typedef uint32_t secbool;

secbool must_check(int i);

Bindgen Invocation

bindgen input.h --must-use-type secbool --allowlist-type secbool --allowlist-function must_check

Actual Results

/* automatically generated by rust-bindgen 0.59.2 */

pub type secbool = u32;
extern "C" {
    pub fn must_check(i: ::std::os::raw::c_int) -> secbool;
}

Expected Results

pub type secbool = u32;
extern "C" {
    #[must_use]
    pub fn must_check(i: ::std::os::raw::c_int) -> secbool;
}

[matejcik]

closed by #2206