Function cpp_signature_trailing_qualifiers 

pub fn cpp_signature_trailing_qualifiers(signature: &str) -> &str

What a signature carries after its parameter list: the trailing cv-/ref-qualifiers and noexcept that the signature identity records (#1827).

Two member declarations with the same parameter types but different trailing qualifiers are distinct declarations, so a caller deciding whether one declaration hides another has to compare this alongside the parameter types.