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Keep short-circuit evaluation when hoisting case expressions - #11
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anf_termhoistedcaseexpressions out of the right operand of∧/∨/⟶,so they were evaluated even when the left operand decided the result: e.g.
xs ≠ [] ∧ (case hd xs of …)raised on[]instead of returningFalse.Such connectives are now bound via an
ifstatement (PIf), so the rightoperand is only evaluated when needed. Plain
and/oroutput is unchangedotherwise.