julia

9612115e - Fix nospecializing Functions in `Union{Nothing,Function}` params (#59327)

Fix nospecializing Functions in `Union{Nothing,Function}` params (#59327) Fixes https://github.com/JuliaLang/julia/issues/59326. Change the logic that decides not to specialize a function parameter based on whether or not the supplied argument is a Function, and that function is not used, so that it will still work if the SpecType is a Union{Function,Nothing} or any other union that contains a Function. The logic is changed from a hardcoded rule of `type_i == Function || type_i == Any || type_i == Base.Callable` to `type_i >: Function`. This covers all of the above cases, but also includes custom `Union{Function, T}` such as `Union{Function, Nothing}`. --------- Co-authored-by: Nick Robinson <npr251@gmail.com> Co-authored-by: Jameson Nash <vtjnash@gmail.com>