perl -Mdiagnostics -le"print for 08 => 1"
Illegal octal digit '8' at -e line 1, at end of line
Execution of -e aborted due to compilation errors (#1)
    (F) You used an 8 or 9 in an octal number.

Uncaught exception from user code:
        Illegal octal digit '8' at -e line 1, at end of line
Execution of -e aborted due to compilation errors.
 at -e line 1