Improved Windows support

src/scanner/scanFile.go

@@ -249,7 +249,7 @@ func (s *Scanner) scanFile(path string, pkg string) error {
 			register := x64.InputRegisters[count]
 			uses := token.Count(function.Body, contents, token.Identifier, name)
 
-			if uses == 0 {
+			if uses == 0 && name != "_" {
 				return errors.New(&errors.UnusedVariable{Name: name}, file, tokens[0].Position)
 			}