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$ perl -MO=Concise,-exec -e'f() and g()' 1 <0> enter v ... 9 <1> entersub[t4] vKS/TARG a <@> leave[1 ref] vKP/REFC -e syntax OK
$ perl -MO=Concise,-exec -e'if (!f()) { g() }' 1 <0> enter v ... 9 <1> entersub[t4] vKS/TARG a <@> leave[1 ref] vKP/REFC -e syntax OK