[Issue 18407] debug should escape nothrow, @nogc, @safe (not just pure)

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18407

--- Comment #6 from Timothee Cour <timothee.cour2 at gmail.com> ---
> This has been approved by Walter
including for remaining ones? (nothrow safe)

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