Parsing rules come to mind, the diamond operator <> does both readline and glob and must use heuristics to decide.

I had cases comparing two functions with < leading to a compile error, because "the closing > was missing"

UPDATE
see Disabling the interpretation of diamond <> operator in package?

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery

In reply to Re: Is there a problem with using barewords as filehandles ? (updated link) by LanX
in thread Is there a problem with using barewords as filehandles ? by syphilis

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