Improved Windows support

src/scanner/queueDirectory.go

@@ -29,6 +29,10 @@ func (s *Scanner) queueDirectory(directory string, pkg string) {
 			return
 		}
 
+		if strings.HasSuffix(name, "_windows.q") && config.TargetOS != "windows" {
+			return
+		}
+
 		fullPath := filepath.Join(directory, name)
 		s.queueFile(fullPath, pkg)
 	})

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)
 			}