Imho a main effect cause its a builtin function.

Do you expect  sub inc { return $_[0] + 1} to cause ambiguity ?

Ok ... Maybe better phrased "a well defined effect" my definition of side was to restricted.

Cheers Rolf

( addicted to the Perl Programming Language)

In reply to Re^3: Order of execution of functions in list by LanX
in thread Order of execution of functions in list by vsespb

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