[Issue 5239] New: optimizer misreports an used before set error

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=5239

           Summary: optimizer misreports an used before set error
           Product: D
           Version: D2
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: braddr at puremagic.com


--- Comment #0 from Brad Roberts <braddr at puremagic.com> 2010-11-18 22:34:20 PST ---
(an excerpt from runnable/interpret.d)

struct S { int x; }
template Compileable(int z) { bool OK=true;}

int goodfoo3()
{
   S[4] w = void; // uninitialized array of structs
   w[$-2].x = 217; // initialize one member
   return w[2].x; // line 8
}

$ dmd -c -O f.d
f.d(8): Error: variable w used before set

note: filed as d2, but might well exist on d1 as well.. untested

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