[Issue 3220] New: Compile time union crash when passed to template

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3220

           Summary: Compile time union crash when passed to template
           Product: D
           Version: 2.031
          Platform: All
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: jeremiep at gmail.com


The following crashes DMD when trying to convert floating point to integral at
compile time using an union:

---
import std.metastrings;
union A {
   double x;
   int y;
}
alias ToString!(A(5.2).y) B; // Crashes here
---

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