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  1. or download this
    warn $];
warn \&CORE::GLOBAL::sleep;
warn \&CORE::sleep;
&CORE::GLOBAL::sleep(3);
  2. or download this
    5.016003 at d:/Users/lanx/pm/core_sleep.pl line 1.
CODE(0x328420) at d:/Users/lanx/pm/core_sleep.pl line 4.
CODE(0x349718) at d:/Users/lanx/pm/core_sleep.pl line 5.  <-- differen
+t!
Undefined subroutine &CORE::GLOBAL::sleep called at d:/Users/lanx/pm/c
+ore_sleep.pl line 7.
  3. or download this
    *old = *CORE::GLOBAL::sleep;
*CORE::GLOBAL::sleep = sub { warn " **** beware of morons **** "};
...
&old();                                 # oops
warn \&CORE::GLOBAL::sleep;
warn \&old;
  4. or download this
     **** beware of morons **** at d:/Users/lanx/pm/core_sleep.pl line 2.
CODE(0x4c9478) at d:/Users/lanx/pm/core_sleep.pl line 7.
CODE(0x4c9478) at d:/Users/lanx/pm/core_sleep.pl line 8. <-- identical
+!
  5. or download this
    lanx@ubuntu14-large:~$ perl
warn $];
...
CODE(0x1804cb8) at - line 2.
CODE(0x1830398) at - line 3.
Undefined subroutine &CORE::GLOBAL::sleep called at - line 4.
  6. or download this
    lanx@ubuntu14-large:~$ perl
*old = *CORE::GLOBAL::sleep;
...
 **** beware of morons ****  at - line 2.
CODE(0x2089448) at - line 5.
CODE(0x2089448) at - line 6.