[php-src] Issue #7900: `never` return type for arrow functions with throw expressions

Issue: https://github.com/php/php-src/issues/7900 Comment Author: iluuu1994 > Otherwise PHP would need looking at the return type in signature to decide if the statement > value must be returned or not? It seems icky Yes, PHP could add the return depending on whether the function is void/never or not. FWIW other languages do the same. E.g. for Swift [this was a problem in the past](https://stackoverflow.com/questions/24150400/one-line-closure-without-return-type) but they now just drop the value when the closure is explicitly marked as returning ().