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  1. or download this
    $ perl -MO=Deparse,-p -le " $a= 1 && 2; print $a; "
    BEGIN { $/ = "\n"; $\ = "\n"; }
    ...
    Can't modify logical and (&&) in scalar assignment at -e line 1, near 
    +"3;"
    -e had compilation errors.
    (($a && $b) = 3);
    
  2. or download this
    
    2012         /* FALL THROUGH */
    ...
    2024                         ? "non-lvalue subroutine call"
    2025                         : OP_DESC(o))),
    2026                      type ? PL_op_desc[type] : "local"));