[Issue 23773] array length assignment in assert condition should error

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23773

--- Comment #5 from RazvanN <razvan.nitu1305 at gmail.com> ---
Well, the compiler rewrites `a.length = i` to `_d_arraysetlengthT(a, i)` so
that's why the assert error is not caught.

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