One advantage of a 'use'-pragma to declare the run-time dependency is that the module name can be checked at compile time, e.g.: 
use required Some::Module;

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can verify that Some::Module is in the @INC path at compile time. Simply using require Some::Module won't do that.

In reply to Re^2: use: distinguishing compile-time vs run-time dependencies by perl5ever
in thread use: distinguishing compile-time vs run-time dependencies by perl5ever

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