public static Type typeOf(Executable executable, int parameterIndex) {
		Type[] genericParameterTypes = executable.getGenericParameterTypes();

		// getGenericParameterTypes() doesn't return synthetic parameters; in this case fall back to getParameterTypes()
		if ( parameterIndex >= genericParameterTypes.length ) {
			genericParameterTypes = executable.getParameterTypes();
		}

		Type type = genericParameterTypes[parameterIndex];

		if ( type instanceof TypeVariable ) {
			type = TypeHelper.getErasedType( type );
		}
		return type;
	}