sed 'w filename' reads till newline needs warning

[Dan Jacobson]

Both the sed manpage and info manual should warn about this bougusness
(that filename must have nothing afterwards, same I bet for "r" etc.)
I mean all it says is
    `w FILE-NAME'
          If the substitution was made, then write out the result to
          the named file.

echo |sed 'w /dev/null;='
sed: Couldn't open file /dev/null;=: Permission denied
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