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for(@a1=`cat file`;$a[0]=shift @a1;@a1)
{
  for(@a2=@b;$a[1]=shift @a2;@a2) # could be "for(;$a[1]=shift @b;@b)"
+ if you don't care about emptying @b
...
    }
  }
}

sub with {for (@{$_[1]}){$_[0] = $_;$_[2]();}}
sub in { \@_  } 
sub run(&) { $_[0] }

# parenthesis mandatory after in, bad idea after with and the commas c
+an't be ommited
with $a[0], in(qw/Bonjour Bonsoir/), 
run {
...
        say "@a";
    }; # semi-colon mandatory
}; # same here

Bonjour Paul
Bonjour Jack
Bonjour Lord Voldemort
Bonsoir Paul
Bonsoir Jack
Bonsoir Lord Voldemort