diff --git a/token.go b/token.go
index 2d7c12c..f0fc464 100644
--- a/token.go
+++ b/token.go
@@ -51,6 +51,10 @@ func NewErrorToken(row, col int, err error) *Token {
 	return NewValueToken(row, col, SymError, fmt.Sprintf("[%d:%d]", row, col), err)
 }
 
+func (tk *Token) Clone() (c *Token) {
+	return NewValueToken(tk.row, tk.col, tk.Sym, tk.source, tk.Value)
+}
+
 func (tk *Token) IsEos() bool {
 	return tk.Sym == SymEos
 }
@@ -67,6 +71,10 @@ func (tk *Token) IsOneOf(termSymbols []Symbol) bool {
 	return termSymbols != nil && slices.Index(termSymbols, tk.Sym) >= 0
 }
 
+func (tk *Token) IsOneOfA(termSymbols ...Symbol) bool {
+	return slices.Index(termSymbols, tk.Sym) >= 0
+}
+
 func (tk *Token) IsSymbol(sym Symbol) bool {
 	return tk.Sym == sym
 }