New bitwise XOR operator specified by symbol ^ (caret). Iterator dereference is now done by prefixed * (star)

parser.go

@@ -441,8 +441,10 @@ func (parser *parser) parseGeneral(scanner *scanner, ctx parserContext, termSymb
 				tk.Sym = SymChangeSign
 			} else if tk.Sym == SymPlus {
 				tk.Sym = SymUnchangeSign
+			} else if tk.IsSymbol(SymStar) {
+				tk.SetSymbol(SymDereference)
 			} else if tk.IsSymbol(SymExclamation) {
-				err = tk.Errorf("postfix opertor %q requires an operand on its left", tk)
+				err = tk.Errorf("postfix opertor %q requires an operand on its left side", tk)
 				break
 			}
 			firstToken = false
@@ -481,7 +483,7 @@ func (parser *parser) parseGeneral(scanner *scanner, ctx parserContext, termSymb
 					currentTerm = mapTerm
 				}
 			}
-		case SymEqual, SymPlusEqual, SymMinusEqual, SymStarEqual, SymSlashEqual, SymPercEqual:
+		case SymEqual, SymPlusEqual, SymMinusEqual, SymStarEqual, SymSlashEqual, SymPercEqual, SymAmpersandEqual, SymVertBarEqual, SymDoubleLessEqual, SymDoubleGreaterEqual, SymCaretEqual:
 			currentTerm, err = tree.addToken(tk)
 			firstToken = true
 		case SymFuncDef:
@@ -518,14 +520,11 @@ func (parser *parser) parseGeneral(scanner *scanner, ctx parserContext, termSymb
 					}
 				}
 			} else {
-				// if hasFlag(ctx, allowIndex) {
-				// 	tk.Sym = SymRange
-				// }
 				currentTerm, err = tree.addToken(tk)
-			}
-			if tk.IsOneOfA(SymColon, SymRange) {
-				// Colon outside a selector term acts like a separator
-				firstToken = true
+				if tk.IsOneOfA(SymColon, SymRange) {
+					// Colon outside a selector term acts like a separator
+					firstToken = true
+				}
 			}
 		default:
 			currentTerm, err = tree.addToken(tk)