fails:Kernel#warn is a private method
fails:Kernel#warn requires multiple arguments
fails:Kernel#warn does not append line-end if last character is line-end
fails:Kernel#warn calls #write on $stderr if $VERBOSE is true
fails:Kernel#warn calls #write on $stderr if $VERBOSE is false
fails:Kernel#warn does not call #write on $stderr if $VERBOSE is nil
fails:Kernel#warn writes each argument on a line when passed multiple arguments
fails:Kernel#warn does not write strings when passed no arguments
fails:Kernel#warn writes the default record separator and NOT $/ to $stderr after the warning message
