[project @ 2005-03-09 14:26:56 by simonpj]
Fix the superclass translation for instance decls Merge to STABLE There is a long-standing difficulty whereby it's surprisingly easy to accidentally generate an entirely-bogus recursive dictionary when generating the definitions for the superclasses of an instance decl. The problem arises because the default story is that whenever we add a constraint to our pile of solved constraints, we automatically add all its superclasses. But that is simply wrong when we are trying to generate superclasses. Solution: do no auto-superclass addition when solving the superclass constraints of an instance declaration. I think should fix it once and for all. tcrun021, tcrun033 are test cases tcrun033 showed up the bug; thanks to Simon Foster and Ralf Laemmel.