Better errors for Debug and Display traits #86386
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Currently, if someone tries to pass value that does not implement
DebugorDisplayto a formatting macro, they get a very verbose and confusing error message. This PR changes the error messages for missingDebugandDisplayimpls to be less overwhelming in this case, as suggested by #85844. I was a little less aggressive in changing the error message than that issue proposed. Still, this implementation would be enough to reduce the number of messages to be much more manageable.After this PR, information on the cause of an error involving a
DebugorDisplayimplementation would suppressed if the requirement originated within a standard library macro. My reasoning was that errors originating from within a macro are confusing when they mention details that the programmer can't see, and this is particularly problematic forDebugandDisplay, which are most often used via macros. It is possible that either a broader or a narrower criterion would be better. I'm quite open to any feedback.Fixes #85844.