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$ perl -MO=Concise,-exec -Mv5.40 -Mbuiltin=inf -e'my $x = inf;' Built-in function 'builtin::inf' is experimental at -e line 1. ... 4 <1> padsv_store[$x:9,10] vKS/LVINTRO 5 <@> leave[1 ref] vKP/REFC -e syntax OK