[Issue 5346] New: instantiation of std.conv.toImpl and std.format.formatValue fails for unions

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=5346

           Summary: instantiation of std.conv.toImpl and
                    std.format.formatValue fails for unions
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: elfy.nv at gmail.com


--- Comment #0 from Nick Voronin <elfy.nv at gmail.com> 2010-12-12 19:07:13 PST ---
import std.conv;
import std.format;
import std.stdio;

union U
{
    int a;
    float b;
}

struct S
{
    int t;
    U u;
}

void main()
{
    U u;
    writeln(text(u)); // error instantiation toImpl
    S s;
    writeln(text(s)); // error instantiation formatValue
}

patching templates in this manner:
-if (is(S == struct) && ...
+if ((is(S == struct) || is(S == union)) && ...
fixes it for me.

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