Slava Pestov 39d486a7fc RequirementMachine: Try to avoid introducing rules of the form T.[P] => T.[Q] ...

These rules would be fine since RHS simplification eliminates them,
but they cause problems for the minimal conformances algorithm.

To avoid introducing such rules, ensure that the critical pair of
two property-like rules is itself a property-like rule instead of
relying on subsequent simplifications sorting it out. See the
new comment in RewriteSystem::computeCriticalPair() for details.

I need to understand this problem better and either fix minimal
conformances or add stronger assertions, but for now this fixes
the last failure with -requirement-machine-abstract-signatures=verify.

2022-03-07 23:19:43 -05:00

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