[Issue 23063] New: It is possible to return a noreturn value

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23063

          Issue ID: 23063
           Summary: It is possible to return a noreturn value
           Product: D
           Version: D2
          Hardware: x86_64
                OS: All
            Status: NEW
          Severity: blocker
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: razvan.nitu1305 at gmail.com

noreturn func()
{
    noreturn a;
    return a;
}

void main()
{
    func();
}

This code compiles and runs succefully, despite the dip [1] explicitly stating:
"Defining a noreturn variable with no initialization expression generates an
assert(0) only if the variable is accessed, which can be useful in generic code
where unused noreturn variables may be declared. Generating the assert(0) as
soon as the variable is live in these cases could prematurely end the program."

This currently blocks: https://github.com/dlang/dmd/pull/12898

[1] https://github.com/dlang/DIPs/blob/master/DIPs/accepted/DIP1034.md

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