Nice explanation. Interestingly, adding the empty prototype to the sub definition and removing return changes the behaviour, as Perl optimizes the sub away: 
sub InfStr () { 'ababa' }

[download]

which is equivalent to 

use constant INFSTR => 'ababa';

[download]
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re^2: Loop Quandary by choroba
in thread Loop Quandary by joshpk105

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