fix: check is valid structure projection when pretty printing #4982
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For structure projections, the pretty printer assumed that the expression was type correct. Now it checks that the object being projected is of the correct type. Such terms appear in type mismatch errors. Also, fixes and improves `#print` for structures. The types of projections now use MessageData (so are now hoverable), and the type of `self` is now the correct type. Closes leanprover#4670
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For structure projections, the pretty printer assumed that the expression was type correct. Now it checks that the object being projected is of the correct type. Such terms appear in type mismatch errors.
Also, fixes and improves
#printfor structures. The types of projections now use MessageData (so are now hoverable), and the type ofselfis now the correct type.Closes #4670