Equivalent of __func__ or __FUNCTION__ in Rust?

Question

In C and C++ you can get the name of the currently executing function through the __func__ macro with C99 & C++11 and ___FUNCTION___ for MSVC.

Answer 1

You can hack one together with std::any::type_name.

macro_rules! function {
    () => {{
        fn f() {}
        fn type_name_of(_: T) -> &'static str {
            std::any::type_name::()
        }
        let name = type_name_of(f);
        &name[..name.len() - 3]
    }}
}

Note that this gives a full pathname, so my::path::my_func instead of just my_func. A demo is available.