Slava Pestov 5ac43b14d2 RequirementMachine: Fully canonicalize substitutions in concrete type rules ...

Previously we did this when adding new concrete type rules,
but we don't have a complete rewrite system at that point yet,
so there was no guarantee concrete substitution terms would
be canonical.

Now, perform simplification in a post-pass after completion,
at the same time as simplifying rule right hand sides.

Rewrite loops are recorded relating the original rule with the
simplified substitutions.

2021-12-13 18:48:23 -05:00

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