[Issue 17423] pointer assignment to `this` in member function is not accounted for

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17423

--- Comment #8 from Walter Bright <bugzilla at digitalmars.com> ---
(In reply to Walter Bright from comment #7)
> https://github.com/dlang/dmd/pull/7999

For this to work, -dip1000 must be used.

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