Enchanced error messages:
If source context is a node, we record the source for it's DEST (if any) as enclosing-source, along with a string describing how the value is used. This enclosing source info is printed when it seems useful. Also, TREE-EQUAL is used instead of EQUAL so that we won't lose on circular forms, we correctly handle NIL source forms, and we print more blank lines to separate consequtive error messages.
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