[Issue 14632] Diagnostic improvement for invalid cast with alias this

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=14632

--- Comment #2 from github-bugzilla at puremagic.com ---
Commit pushed to master at https://github.com/dlang/dmd

https://github.com/dlang/dmd/commit/4d4cd923df4401cf4aef4744c5c122adf8aeb631
Fix Issue 6777 and 14632 - alias this disables casting for classes

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