+ NOTE: This warning detects symbols that have been used only - once so c, c, c, sub c, c(), &c, *c and c (the filehandle) are + once so $c, @c, %c, *c, &c, sub c{}, c(), and c (the filehandle) are + considered the same; if a program uses $c only once but also + uses sub c, it will not trigger this warning.Thread Next