[Issue 18002] assert subverts the type system with the messages that it accepts

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18002

--- Comment #4 from hsteoh at quickfur.ath.cx ---
.idup may not be usable if the assert is triggered by an out-of-memory
condition.

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