[Issue 22634] New: assert for too many symbols should be error

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22634

          Issue ID: 22634
           Summary: assert for too many symbols should be error
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: tim.dlang at t-online.de

void main()
{
    static foreach(i; 0..65537)
    {
    }
}

The above code triggers an assert in src/dmd/expressionsem.d:
assert(s.localNum);         // 65535 should be enough for anyone

I found it while reducing a different problem, so it may not be a problem in
real code, but it should be a normal error instead of an assert.

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