Throw expressions about compiler HOT 4 CLOSED

Could be realized by an IIFE:

// Given this input...
$a ?? throw new \lang\IllegalArgumentException("X");

// ...the compiler would emit this:
$a ?? (function() { throw new \lang\IllegalArgumentException("X"); })()

from compiler.

Good blog article on throws expressions in C# 7.0

http://gunnarpeipman.com/csharp/throw-expressions/

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Stackoverflow question covering the problem:

https://stackoverflow.com/questions/9544976/using-throw-in-a-javascript-expression

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In Kotlin, throw is an expression:

https://kotlinlang.org/docs/reference/exceptions.html#the-nothing-type

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