[Issue 21049] template inside template causes internal compile error

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21049

--- Comment #1 from cy <dlang at verge.info.tm> ---
Created attachment 1799
  --> https://issues.dlang.org/attachment.cgi?id=1799&action=edit
The compiler error backtrace

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