tests/headers/func_with_func_ptr_arg.h - third_party/github.com/rust-lang/rust-bindgen - Git at Google

 void foo(void (*bar)());

 void bar(void (*one)(int a, int b), void (*two)(int c, int d));
	void foo(void (*bar)());

	void bar(void (one)(int a, int b), void (two)(int c, int d));