[Issue 17987] New: Cannot use string in Variant at compile time

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17987

          Issue ID: 17987
           Summary: Cannot use string in Variant at compile time
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: issues.dlang at jmdavisProg.com

This code

==========
import std.variant;

Variant v = "hello";

void main()
{
}
==========

results in this error:

/usr/local/include/dmd/std/variant.d(624): Error: memcpy cannot be interpreted
at compile time, because it has no available source code
/usr/local/include/dmd/std/variant.d(559):        called from here:
this.opAssign(value)
q.d(3):        called from here: VariantN(& handler, cast(ubyte)0u,
).this("hello")

I would _think_ that it could be made to work without memcpy, but I don't know.
Regardless, the use of memcpy restricts the ability to use Variant at compile
time. So ideally, Variant would be fixed so that the example here worked.

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