[Pitch] Introduce `let-else` syntax as alternative for single expression `guard-let-else`

[mayoff (Rob Mayoff)]

@drewmccormack

Sure, that solves one case, but only the throwing one. There are many other 'early returns' covered by a guard.

Here's a quote from a discussion about a different requested language feature, because I, curmudgeon, feel it applies here:

@Slava_Pestov

I admit I wish the general discussion on this forum was centered more on "how do I achieve what I want to do with the existing language features" rather than "here's a new language feature that solves my immediate problem today, what does everything think of adding it to the language?"