WIP: mut_mut: generalize the from-expansion check
#15419
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The check was added in #1032, which addressed #939, which did complain about the particular case of a for-loop. But for some reason, the fix also concentrated on for-loops only. I'm pretty sure
Span::from_expansionis more generally helpful.WIP because this apparently also stops the lint from firing on the
inline!proc-macro thing, which I'm not quite sure is correct?.. That would resolve #15417 (comment) though I guesschangelog: none