[Issue 20167] Issue warning when result discarded from strong pure function?

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20167

--- Comment #2 from Manu <turkeyman at gmail.com> ---
Interesting.

I did this same test, but I didn't have `nothrow`.
Why wasn't `nothrow` inferred for this trivial function where the source is as
plain as day to the compiler?

We're meant to be all about attribute inference these days.

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