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Use (new) bool2val instead of Val.of_bool #661

Closed andrew-appel closed 1 year ago

andrew-appel commented 1 year ago

This P.R. implements the suggestion in issue #625. It's an experiment, as in some cases it breaks existing VST proofs at forward_if and related tactics. The changes required in those proofs are generally positive (simplifies proof scripts). See further discussion at #625. closes #625

Incidentally and unrelated: closes #660