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sub subby(&\@\@)
{
...

 @result;
}

my @subset = subby { .. logic .. } @A, @B;

my @subset = subby { .. logic .. } @A, grep { .. logic .. } @B;

Type of arg 3 to main::subby must be array (not grep iterator) at ./te
+st line 36, near "@B;"

my @subset = subby { .. logic .. } @A, (grep { .. logic .. } @B);