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2f8867e03c
Annotate some bugs Gives a semi-helpful message to some `bug!()`/`unreachable!()`/`panic!()`. This also works around some other bugs/panics/etc that weren't needed, and also makes some of them into `span_bug!`s so they also have a useful span. Note to reviewer: best to disable whitespace when comparing for some cases where indentation changed. cc #118955