[Issue 18712] New: bogus "switch skips declaration" error with case in mixin

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18712

          Issue ID: 18712
           Summary: bogus "switch skips declaration" error with case in
                    mixin
           Product: D
           Version: D2
          Hardware: All
                OS: Windows
            Status: NEW
          Severity: regression
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: r.sagitario at gmx.de

With dmd master this code produces an error:

int test(int n)
{
        switch(n)
        {
        mixin("case 0:");
                int x = 1;
                return x;
        case 1:
                int y = 2;
                return y;
        default:
                return -1;
        }
}

swtch.d(4): Error: switch skips declaration of variable swtch.test.x at
swtch.d(7)

Workaround: move the default case before the mixin.

This was a deprecation before but went unnoticed because the code compiled with
-d as it is otherwise flooded with deprecation warnings (hint: deprecation
should either be shown just once or be disabled selectively).

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