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  1. or download this
    D:\TEMP>perl -e"sub f{'fred'} goto +f"
Can't find label SCALAR(0x15d7c1c) at -e line 1.
...
D:\TEMP>perl -e"sub f{'fred'} goto f->()"
Can't find label SCALAR(0x15d7c1c) at -e line 1.
  2. or download this
    D:\TEMP>perl -e"sub f{'fred'} goto ~~f"
Can't find label fred at -e line 1.
...

D:\TEMP>perl -e"sub f{'fred'} goto ${\f}"
Can't find label fred at -e line 1.