[Issue 13116] Should not be able to return ref to 'this'

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13116

--- Comment #3 from hsteoh at quickfur.ath.cx ---
Note that it's OK to do this with structs because the address of the original
struct is returned, not the address of the `this` implicit variable.

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