Fair enough, but why does it work and print the value of $PI if I comment out the use of CONST in main entirely (i.e. main's last line)? Also adding a sub in XYZ and calling it from main works ok. Is it because it can live without unresolved subs until it actually has to call them? But it has to resolve each and every variable before execution (when using strict at least)?
The long story is that I ended using require because I have a module which overrides a core sub (sleep) via a BEGIN block. I need that to apply for ALL subsequent modules, mine or foreign, and I kind of reasoned that loading everything else at runtime (via require) will make sure that this is satisfied and sleep is overriden. Now I am not sure whether a module used via another module is using the overriden sleep version.
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