proposal: let in if parentheses

[Ali Rahbari]

while it's possible to use let keyword in for loop parentheses, it's not
possible to use it in if parentheses.

There are two use cases for this:

*1- if (let a = b()) a.c();*
 this can be done using optional chaining which is proposed:
b()?.c();

*2- if (let a = b()) c(a);*
this or more sophisticated patterns can't be done in any way other than
this:
let a = b();
if (a) c(a);

the problem here beside more line of codes, is *a *is defined outside of if
scope.
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