[refactoring] update Token structure

pkg/ast/visitor/dump.go

@@ -113,9 +113,6 @@ func (v *Dump) printToken(key string, t *token.Token) {
 	v.printIndent(v.indent + 1)
 	v.print("Value:   []byte(" + strconv.Quote(string(t.Value)) + "),\n")
 
-	v.printIndent(v.indent + 1)
-	v.print("Skipped: []byte(" + strconv.Quote(string(t.Skipped)) + "),\n")
-
 	v.printIndent(v.indent)
 	v.print("},\n")
 }

pkg/token/token.go

@@ -147,11 +147,10 @@ const (
 )
 
 type Token struct {
-	ID            ID
-	Value         []byte
-	Position      *position.Position
-	SkippedTokens []*Token
-	Skipped       []byte
+	ID           ID
+	Value        []byte
+	Position     *position.Position
+	FreeFloating []*Token
 }
 
 func (t *Token) GetPosition() *position.Position {