diff --git a/LuaTypes.cs b/LuaTypes.cs
index 49f479d..1e463a4 100644
--- a/LuaTypes.cs
+++ b/LuaTypes.cs
@@ -45,3 +45,27 @@ public interface INumeral
 
 	public bool RawEqual(INumeral other);
 }
+
+class CodeRegion(CodeLocation start, CodeLocation end)
+{
+	public CodeLocation start = start;
+	public CodeLocation end = end;
+
+	public override string ToString()
+	{
+		return $"{start}-{end}";
+	}
+}
+
+class CodeLocation(int line, int col)
+{
+	public int line = line;
+	public int col = col;
+
+	public CodeLocation(CodeLocation other) : this(line: other.line, col: other.col) { }
+
+	public override string ToString()
+	{
+		return $"{line + 1}:{col + 1}";
+	}
+}
diff --git a/Tokenizer.cs b/Tokenizer.cs
index cdec0a5..76d5a93 100644
--- a/Tokenizer.cs
+++ b/Tokenizer.cs
@@ -94,6 +94,49 @@ class Tokenizer
 		currentToken = new(region: new(start: new(currentLocation), end: new(currentLocation)), type: TokenType.Name, data: new Token.StringData($"{ch}"));
 	}
 
+	private void Backtrack(TokenType newType)
+	{
+		if(currentToken == null || currentToken.type == null)
+		{
+			throw new Exception($"Lexer error at {currentLocation}");
+		}
+		currentToken.type = newType;
+		currentToken.data = null;
+		currentLocation = new(currentToken.region.end);
+		tokens.Add(currentToken);
+		currentToken = null;
+		index = lastIndex!.Value;
+		lastIndex = null;
+		state = State.Start;
+	}
+	private void BacktrackNoClear(TokenType newType)
+	{
+		if(currentToken == null || currentToken.type == null)
+		{
+			throw new Exception($"Lexer error at {currentLocation}");
+		}
+		currentToken.type = newType;
+		currentLocation = new(currentToken.region.end);
+		tokens.Add(currentToken);
+		currentToken = null;
+		index = lastIndex!.Value;
+		lastIndex = null;
+		state = State.Start;
+	}
+	private void BacktrackNoTypeChange()
+	{
+		if(currentToken == null || currentToken.type == null)
+		{
+			throw new Exception($"Lexer error at {currentLocation}");
+		}
+		currentLocation = new(currentToken.region.end);
+		tokens.Add(currentToken);
+		currentToken = null;
+		index = lastIndex!.Value;
+		lastIndex = null;
+		state = State.Start;
+	}
+
 	private void TokenizeChar(char ch)
 	{
 		switch(state)
@@ -547,36 +590,23 @@ class Tokenizer
 					}
 					break;
 					case 'z':
-					{
 						state = State.SingleQuoteBackslashZ;
-					}
-					break;
+						break;
 					case 'x':
-					{
 						state = State.SingleQuoteBackslashX;
-					}
-					break;
+						break;
 					case 'u':
-					{
 						state = State.SingleQuoteBackslashU;
-					}
-					break;
+						break;
 					default: throw new Exception($"Unknown escape sequence: \\{ch}");
 				}
 			}
 			break;
 			case State.SingleQuoteBackslashU:
-			{
-				if(ch == '{')
-				{
-					state = State.SingleQuoteBackslashUBracket;
-				}
-				else
-				{
-					throw new Exception($"Expected `{{` to continue \\u escape sequence at {currentLocation}, got {ch}");
-				}
-			}
-			break;
+				state = ch == '{'
+					? State.SingleQuoteBackslashUBracket
+					: throw new Exception($"Expected `{{` to continue \\u escape sequence at {currentLocation}, got {ch}");
+				break;
 			case State.SingleQuoteBackslashUBracket:
 			{
 				if(char.IsAsciiHexDigit(ch))
@@ -715,18 +745,7 @@ class Tokenizer
 			break;
 			case State.String:
 			{
-				if(currentToken == null || currentToken.type == null)
-				{
-					throw new Exception($"Lexer error at {currentLocation}");
-				}
-				currentToken.type = TokenType.StringLiteral;
-				//currentToken.region.end = new(currentLocation);
-				currentLocation = new(currentToken.region.end);
-				tokens.Add(currentToken);
-				currentToken = null;
-				index = lastIndex!.Value;
-				lastIndex = null;
-				state = State.Start;
+				BacktrackNoClear(TokenType.StringLiteral);
 			}
 			break;
 			case State.Name:
@@ -740,17 +759,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -776,16 +785,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoTypeChange();
 				}
 			}
 			break;
@@ -825,16 +825,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoTypeChange();
 				}
 			}
 			break;
@@ -853,16 +844,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoTypeChange();
 				}
 			}
 			break;
@@ -887,16 +869,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoTypeChange();
 				}
 			}
 			break;
@@ -914,16 +887,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoTypeChange();
 				}
 			}
 			break;
@@ -951,16 +915,7 @@ class Tokenizer
 			case State.ColonColon:
 			case State.SlashSlash:
 			{
-				if(currentToken == null || currentToken.type == null)
-				{
-					throw new Exception($"Lexer error at {currentLocation}");
-				}
-				currentLocation = new(currentToken.region.end);
-				tokens.Add(currentToken);
-				currentToken = null;
-				index = lastIndex!.Value;
-				lastIndex = null;
-				state = State.Start;
+				BacktrackNoTypeChange();
 			}
 			break;
 			case State.Tilde:
@@ -973,16 +928,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoTypeChange();
 				}
 			}
 			break;
@@ -1002,16 +948,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoTypeChange();
 				}
 			}
 			break;
@@ -1031,16 +968,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoTypeChange();
 				}
 			}
 			break;
@@ -1054,16 +982,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoTypeChange();
 				}
 			}
 			break;
@@ -1077,16 +996,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoTypeChange();
 				}
 			}
 			break;
@@ -1101,16 +1011,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoTypeChange();
 				}
 			}
 			break;
@@ -1124,16 +1025,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoTypeChange();
 				}
 			}
 			break;
@@ -1147,16 +1039,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoTypeChange();
 				}
 			}
 			break;
@@ -1170,16 +1053,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoTypeChange();
 				}
 			}
 			break;
@@ -1274,16 +1148,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoTypeChange();
 				}
 			}
 			break;
@@ -1356,17 +1221,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -1387,17 +1242,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -1412,18 +1257,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.And;
-					currentToken.data = null;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					Backtrack(TokenType.And);
 				}
 			}
 			break;
@@ -1444,17 +1278,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -1475,17 +1299,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -1506,17 +1320,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -1537,17 +1341,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -1562,18 +1356,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.While;
-					currentToken.data = null;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					Backtrack(TokenType.While);
 				}
 			}
 			break;
@@ -1594,17 +1377,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -1625,17 +1398,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -1656,17 +1419,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -1687,17 +1440,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -1712,18 +1455,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Break;
-					currentToken.data = null;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					Backtrack(TokenType.Break);
 				}
 			}
 			break;
@@ -1744,17 +1476,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -1775,17 +1497,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -1806,17 +1518,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -1831,18 +1533,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Goto;
-					currentToken.data = null;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					Backtrack(TokenType.Goto);
 				}
 			}
 			break;
@@ -1863,17 +1554,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -1900,17 +1581,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -1931,17 +1602,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -1962,17 +1623,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -1993,17 +1644,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -2018,18 +1659,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Return;
-					currentToken.data = null;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					Backtrack(TokenType.Return);
 				}
 			}
 			break;
@@ -2050,17 +1680,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -2081,17 +1701,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -2112,17 +1722,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -2137,18 +1737,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Repeat;
-					currentToken.data = null;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					Backtrack(TokenType.Repeat);
 				}
 			}
 			break;
@@ -2175,17 +1764,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -2206,17 +1785,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -2231,18 +1800,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Nil;
-					currentToken.data = null;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					Backtrack(TokenType.Nil);
 				}
 			}
 			break;
@@ -2263,17 +1821,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -2288,18 +1836,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Not;
-					currentToken.data = null;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					Backtrack(TokenType.Not);
 				}
 			}
 			break;
@@ -2326,17 +1863,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -2357,17 +1884,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -2388,17 +1905,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -2413,18 +1920,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Then;
-					currentToken.data = null;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					Backtrack(TokenType.Then);
 				}
 			}
 			break;
@@ -2445,17 +1941,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -2476,17 +1962,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -2501,18 +1977,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.True;
-					currentToken.data = null;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					Backtrack(TokenType.True);
 				}
 			}
 			break;
@@ -2539,17 +2004,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -2570,17 +2025,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -2601,17 +2046,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -2632,18 +2067,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Else;
-					currentToken.data = null;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					Backtrack(TokenType.Else);
 				}
 			}
 			break;
@@ -2664,17 +2088,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -2689,18 +2103,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Elseif;
-					currentToken.data = null;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					Backtrack(TokenType.Elseif);
 				}
 			}
 			break;
@@ -2721,17 +2124,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -2746,18 +2139,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.End;
-					currentToken.data = null;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					Backtrack(TokenType.End);
 				}
 			}
 			break;
@@ -2778,17 +2160,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -2803,18 +2175,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Or;
-					currentToken.data = null;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					Backtrack(TokenType.Or);
 				}
 			}
 			break;
@@ -2835,17 +2196,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -2860,18 +2211,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Do;
-					currentToken.data = null;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					Backtrack(TokenType.Do);
 				}
 			}
 			break;
@@ -2898,17 +2238,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -2923,18 +2253,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.In;
-					currentToken.data = null;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					Backtrack(TokenType.In);
 				}
 			}
 			break;
@@ -2949,18 +2268,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.If;
-					currentToken.data = null;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					Backtrack(TokenType.If);
 				}
 			}
 			break;
@@ -2993,17 +2301,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -3024,17 +2322,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -3055,17 +2343,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -3086,17 +2364,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -3117,17 +2385,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -3148,17 +2406,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -3179,17 +2427,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -3204,18 +2442,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Function;
-					currentToken.data = null;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					Backtrack(TokenType.Function);
 				}
 			}
 			break;
@@ -3236,17 +2463,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -3267,17 +2484,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -3298,17 +2505,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -3323,18 +2520,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.False;
-					currentToken.data = null;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					Backtrack(TokenType.False);
 				}
 			}
 			break;
@@ -3355,17 +2541,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -3380,18 +2556,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.For;
-					currentToken.data = null;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					Backtrack(TokenType.For);
 				}
 			}
 			break;
@@ -3412,17 +2577,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -3443,17 +2598,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -3474,17 +2619,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -3505,17 +2640,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -3530,18 +2655,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Local;
-					currentToken.data = null;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					Backtrack(TokenType.Local);
 				}
 			}
 			break;
@@ -3562,17 +2676,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -3593,17 +2697,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -3624,17 +2718,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -3655,17 +2739,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Name;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					BacktrackNoClear(TokenType.Name);
 				}
 			}
 			break;
@@ -3680,18 +2754,7 @@ class Tokenizer
 				}
 				else
 				{
-					if(currentToken == null || currentToken.type == null)
-					{
-						throw new Exception($"Lexer error at {currentLocation}");
-					}
-					currentToken.type = TokenType.Until;
-					currentToken.data = null;
-					currentLocation = new(currentToken.region.end);
-					tokens.Add(currentToken);
-					currentToken = null;
-					index = lastIndex!.Value;
-					lastIndex = null;
-					state = State.Start;
+					Backtrack(TokenType.Until);
 				}
 			}
 			break;
@@ -3732,31 +2795,7 @@ class Tokenizer
 	}
 }
 
-class CodeRegion(CodeLocation start, CodeLocation end)
-{
-	public CodeLocation start = start;
-	public CodeLocation end = end;
-
-	public override string ToString()
-	{
-		return $"{start}-{end}";
-	}
-}
-
-class CodeLocation(int line, int col)
-{
-	public int line = line;
-	public int col = col;
-
-	public CodeLocation(CodeLocation other) : this(line: other.line, col: other.col) { }
-
-	public override string ToString()
-	{
-		return $"{line + 1}:{col + 1}";
-	}
-}
-
-class Token(CodeRegion region, TokenType? type = null, Token.IData? data = null)
+internal class Token(CodeRegion region, TokenType? type = null, Token.IData? data = null)
 {
 	public CodeRegion region = region;
 	public IData? data = data;