The title is the entire question really. I just got to wondering why the execution order for some expressions, for example: 

my $rv = func( $i, ++i, $i+2 );

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are institutionally undefined? Is because defining the execution order is:

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
Lingua non convalesco, consenesco et abolesco.
Rule 1 has a caveat! -- Who broke the cabal?

In reply to Why is the execution order of subexpressions undefined? by BrowserUk

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