Remove ObligationCause::span()
method #132243
Merged
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I think it's an incredibly confusing footgun to expose both
obligation_cause.span
andobligation_cause.span()
. Especially becauseObligationCause::span()
(the method) seems to just be hacking around a single quirk in the way we set up obligation causes for match arms.First commit removes the need for that hack, with only one diagnostic span changing (but IMO not really getting worse -- I'd argue that it was already confusing).