'use 5.10' exports 'say()' into your namespace.

No, it causes say to be recognized as an operator (like print) within the current lexical scope. Nothing to do with namespaces (packages) whatsoever.

In reply to Re^6: Bareword "SEEK_END" not allowed while "strict subs" in use (FH) by ikegami
in thread Bareword "SEEK_END" not allowed while "strict subs" in use by thanos1983

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