__attribute__((noreturn)) in function pointer argument applies to function's type

[remexre]

Input C/C++ Header

void foo(__attribute__((noreturn)) void (*arg)(void));

Bindgen Invocation

$ bindgen /tmp/foo.h

Actual Results

/* automatically generated by rust-bindgen 0.66.1 */

extern "C" {
    pub fn foo(arg: ::std::option::Option<unsafe extern "C" fn() -> !>) -> !;
}

Expected Results

/* automatically generated by rust-bindgen 0.66.1 */

extern "C" {
    pub fn foo(arg: ::std::option::Option<unsafe extern "C" fn() -> !>);
}

Note the lack of the second -> !.

Notes

I'm fairly sure the problem is here:

rust-bindgen/bindgen/ir/function.rs

Lines 508 to 511 in d0c2b1e

	// This looks easy to break but the clang parser keeps the type spelling clean even if
	// other attributes are added.
	is_divergent =
	is_divergent || ty.spelling().contains("__attribute__((noreturn))");

Since the type of argument of the function contains __attribute__((noreturn)), this assumes that the function does as well...