in reply to Re^5: Bareword "SEEK_END" not allowed while "strict subs" in use (FH)
in thread Bareword "SEEK_END" not allowed while "strict subs" in use

'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.