[Issue 16621] [REG2.060] DMD hang in semantic3 on alias this

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=16621

--- Comment #2 from Walter Bright <bugzilla at digitalmars.com> ---
Fix for the hang:

https://github.com/dlang/dmd/pull/7588

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