#include <slang/util/Function.h>
template<typename Fn>
function_ref class
An efficient, type-erasing, non-owning reference to a callable.
This is intended for use as the type of a function parameter that is not used after the function in question returns.
This class does not own the callable, so it is not in general safe to store a function_ref.
NOTE: This is based on the type of the same name from the LLVM project.