recommend using a HashMap if a HashSet's second generic parameter doesn't implement BuildHasher closes rust-lang/rust#147147 ~The suggestion span is wrong, but I'm not sure how to find the right one.~ fixed I'm relatively new to the diagnostics ecosystem, so I'm not sure if `span_help` is the right choice. `span_suggestion_*` might be better, but the output from `x test` looks weird in that case. |
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