[Issue 21069] New: Variant.get!Variant segfault

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21069

          Issue ID: 21069
           Summary: Variant.get!Variant segfault
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: minor
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: schveiguy at yahoo.com

By accident, I tried to get a Variant out of a Variant.

The result is a segfault.

Variant v = 1;
auto y = v.get!Variant; // segfault

I don't think this should segfault. I don't know what the code is doing. There
are two options to fix this:

1. get!Variant should be statically disallowed.
2. Preferred: get!Variant should `return this;`.

The second option allows generic code to not have to care about whether the
type requested is gettable. i.e. I don't have to write:

static if(is(T == Variant)) return v;
else return v.get!T;

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