Off the top of my head, I came up with the following problems:

• Some errors that would occur at script start-up now occurs when the function is called instead.
• The prototypes of functions in the module will get ignored.
• CHECK blocks in the module won't get executed and will issue a warning.
• INIT blocks in the module won't get executed and will issue a warning.
• Packagers such are PAR might not notice the module. (I'm not sure how they work.)

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