Trivial. 

my $f = f(a);
my $g = g(b);
my $h = h(c);
$f + $g * $h;

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And then you fire the programmer putting such side-effects in the code.

In reply to Re^36: Side-effects are bad form [was: Why is the execution order...] by Anonymous Monk
in thread Why is the execution order of subexpressions undefined? by BrowserUk

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