From type/Any

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multi method end(Any:U: --> 0)
multi method end(Any:D:)

Interprets the invocant as a list, and returns the last index of that list.

say 6.end;                      # OUTPUT: «0␤» 
say <a b c>.end;                # OUTPUT: «2␤»

From type/List

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sub    end($list --> Int:D)
method end(List:D: --> Int:D)

Returns the index of the last element.

say (1,2,3,4).end; # OUTPUT: «3␤»