Signature help for delegate types

If you're looking at this, ready to type a lambda, how do you know what to type next?

If it's Func<...> or Action<...> it's easy. For two or three others, I have the signature memorized and can translate the generic types in my head to the appropriate locations (e.g. Predicate<X>). For 99% of delegate types, it's a bunch of F12ing or F1ing every time.

Could signature help show something like this?

ParseArgument<SemanticVersion> is (ArgumentResult result) => SemanticVersion

@CyrusNajmabadi mentioned that something similar is already shown for anonymous types:

🔗 Also reported at AB#1244148