[Issue 12571] Regression (2.063): Can no longer use static introspection on circular references

[d-bugmail]

https://issues.dlang.org/show_bug.cgi?id=12571

--- Comment #3 from Andrej Mitrovic <andrej.mitrov...@gmail.com> ---
(In reply to Kenji Hara from comment #2)
> (In reply to Andrej Mitrovic from comment #0)
> > -----
> > mixin template getScopeName()
> > {
> >     enum scopeName = __traits(identifier, __traits(parent, scopeName));
> > }
> > 
> > void main()
> > {
> >     mixin getScopeName;
> >     pragma(msg, scopeName);
> > }
> > -----
> 
> I don't think the code should work. When declaring scopeName variable,
> referring it in its initializer should cause forward reference error.
> 
> > There is also a library workaround but it introduces symbol bloat:
> [snip]
> 
> More simple another way exists.
> 
> mixin template getScopeName()
> {
> //  enum scopeName = __traits(identifier, __traits(parent, scopeName));
>     enum scopeName = __traits(identifier, __traits(parent, getScopeName));
> }
> 
> void main()
> {
>     mixin getScopeName;
>     pragma(msg, scopeName);
> }
> 
> Mixed-in template also have parent, so __traits(parent, getScopeName) will
> return the mixed in scope.

That doesn't work. It will return 'test' which is the module name rather than
'main'.

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