[Issue 23904] Spurious "struct [...] already exists"

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23904

--- Comment #3 from RazvanN <razvan.nitu1305 at gmail.com> ---
This looks to me like a dupe of: https://issues.dlang.org/show_bug.cgi?id=19024
. Although the issues appears as being fixed, I think that the fix was just a
hack that masks the true issue: using mangling names as type decorators does
not work for template alias parameters.

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