The extra info is included whenever perl's last input filehandle is set (by readline, eof, tell, or sysseek) and $. is true. close resets $., and so will supress the info. I'm trying to come up with an harmless way of suppressing it in general; the best I can do is: 
{
   local $.; scalar tell STDOUT;
   warn "whatever";
}

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Localizing $. doesn't do what you might expect; instead of doing anything to the actual value of the line number of the current input file, it only sets up the local input filehandle itself to be restored at the end of the block.

In reply to Re: Playing with non-localized $_ in nested loops. by ysth
in thread Playing with non-localized $_ in nested loops. by davido

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