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Simon Peyton Jones authored
This bug was revealed by Trac #11362. It turns out that in my patch for Trac #11148 (namely 1160dc51), I failed to turn one occurrence of tvs' into full_tvs. Sigh. This is tricky stuff and it cost me several hours to page it back in and figure out what was happening. The result was a CoAxiom whose lhs had rhs had different kinds. Eeek! Anyway it's fixed. I also added an ASSERT, in FamInst.newFamInst, that trips on such bogus CoAxioms.
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