recommend using a HashMap if a HashSet's second generic parameter doesn't implement BuildHasher #147171
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…sn't implement BuildHasher
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closes #147147
The suggestion span is wrong, but I'm not sure how to find the right one.fixedI'm relatively new to the diagnostics ecosystem, so I'm not sure if
span_helpis the right choice.span_suggestion_*might be better, but the output fromx testlooks weird in that case.