[Issue 20346] New: std.uuid does not compile with checkaction=context

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20346

          Issue ID: 20346
           Summary: std.uuid does not compile with checkaction=context
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: druntime
          Assignee: nobody at puremagic.com
          Reporter: moonlightsentinel at disroot.org

Reduced test case:

struct UUID
{
        union
        {
            ubyte[] data;
        }
}

unittest
{
        ubyte[] data;
        enum ctfe = UUID();
        assert(ctfe.data == data);
}

=> Error: cannot modify constant expression UUID(null).data

This is caused by _d_assert_fail taking a mutable reference to an immutable
enum member.

Ommiting the union { ... } does not trigger this error, this seems to be
another DMD bug

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