To error: 
use Module 4.56;  # 4.50 adds foo()
                  # 4.56 fixes bug in bar()

[download]
To warn: 
use Module;
if ( !eval { Module->VERSION(4.56); 1 } ) {
   warn(...);
}

[download]

In reply to Re: Programmatically comparing module version numbers by ikegami
in thread Programmatically comparing module version numbers by Anonymous Monk

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