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This function created new Vars with varno different from varnoold, which is a condition that should never prevail before setrefs.c does the final variable-renumbering pass. The created Vars could not be seen as equal() to normal Vars, which among other things broke equivalence-class processing for them. The consequences of this were indeed visible in the regression tests, in the form of failure to propagate constants as one would expect. I stumbled across it while poking at bug #11457 --- after intentionally disabling join equivalence processing, the security-barrier regression tests started falling over with fun errors like "could not find pathkey item to sort", because of failure to match the corrupted Vars to normal ones. |
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