diff --git a/source/Parser.elna b/source/Parser.elna
deleted file mode 100644
index 1225750..0000000
--- a/source/Parser.elna
+++ /dev/null
@@ -1,1174 +0,0 @@
-(* This Source Code Form is subject to the terms of the Mozilla Public License,
-  v. 2.0. If a copy of the MPL was not distributed with this file, You can
-  obtain one at https://mozilla.org/MPL/2.0/. *)
-module;
-
-import cstdlib, common, Lexer;
-
-type
-  Parser = record
-    lexer: ^Lexer
-  end;
-
-  AstLiteralKind* = (
-    integer,
-    string,
-    null,
-    boolean
-  );
-  AstLiteral* = record
-    kind: AstLiteralKind;
-    value: union
-      integer: Int;
-      string: String;
-      boolean: Bool
-    end
-  end;
-
-  AstUnaryOperator* = (
-    reference,
-    not,
-    minus
-  );
-  AstBinaryOperator* = (
-    sum,
-    subtraction,
-    multiplication,
-    division,
-    remainder,
-    equals,
-    not_equals,
-    less,
-    greater,
-    less_equal,
-    greater_equal,
-    disjunction,
-    conjunction,
-    exclusive_disjunction,
-    shift_left,
-    shift_right
-  );
-
-  AstExpressionKind* = (
-    literal,
-    identifier,
-    array_access,
-    dereference,
-    field_access,
-    unary,
-    binary,
-    call
-  );
-  AstExpression* = record 
-    kind: AstExpressionKind
-    value: union
-      literal: ^AstLiteral;
-      identifier: Identifier;
-      reference: ^AstExpression;
-      array_access: record
-        array: ^AstExpression;
-        index: ^AstExpression
-      end;
-      field_access: record
-        aggregate: ^AstExpression;
-        field: Identifier
-      end;
-      unary: record
-        operator: AstUnaryOperator;
-        operand: ^AstExpression
-      end;
-      binary: record
-        operator: AstBinaryOperator;
-        lhs: ^AstExpression;
-        rhs: ^AstExpression
-      end;
-      call: record
-        callable: ^AstExpression;
-        argument_count: Word;
-        arguments: ^^AstExpression
-      end
-    end
-  end;
-
-  ConditionalStatement = record
-    condition: ^AstExpression;
-    branch: AstCompoundStatement
-  end;
-
-  AstStatementKind* = (
-    if_statement,
-    while_statement,
-    assignment_statement,
-    return_statement,
-    call_statement
-  );
-  AstStatement* = record
-    kind: AstStatementKind
-    value: union
-      if_statement: ConditionalStatement;
-      while_statement: ConditionalStatement;
-      assignment_statement: record
-        assignee: ^AstExpression;
-        assignment: ^AstExpression
-      end;
-      return_statement: ^AstExpression;
-      call_statement: ^AstExpression
-    end
-  end;
-  AstCompoundStatement* = record
-    count: Word;
-    statements: ^^AstStatement
-  end;
-
-  AstImportStatement* = record
-    package: Identifier;
-    symbols: ^Identifier
-  end;
-
-  AstConstantDeclaration* = record
-    constant_name: Identifier;
-    constant_value: Int
-  end;
-
-  AstFieldDeclaration* = record
-    field_name: Identifier;
-    field_type: ^AstTypeExpression
-  end;
-
-  AstTypeExpressionKind* = (
-    named_expression,
-    record_expression,
-    enumeration_expression,
-    array_expression,
-    pointer_expression,
-    procedure_expression
-  );
-  AstTypeExpression* = record
-    kind: AstTypeExpressionKind;
-    value: union
-      name: Identifier;
-      cases: ^Identifier;
-      target: ^AstTypeExpression;
-      fields: ^AstFieldDeclaration;
-      array_expression: record
-        base: ^AstTypeExpression;
-        length: Word
-      end;
-      parameters: ^^AstTypeExpression
-    end
-  end;
-
-  AstTypedDeclaration* = record
-    identifier: Identifier;
-    type_expression: ^AstTypeExpression
-  end;
-
-  AstVariableDeclaration* = record
-    variable_name: Identifier;
-    variable_type: ^AstTypeExpression
-  end;
-
-  AstProcedureDeclaration* = record
-    name: Identifier;
-    parameter_count: Word;
-    parameters: ^AstTypedDeclaration;
-    return_type: ^AstTypeExpression;
-    constants: ^^AstConstantDeclaration;
-    variables: ^^AstVariableDeclaration;
-    statements: AstCompoundStatement
-  end;
-
-  AstModule* = record
-    main: Bool;
-    imports: ^^AstImportStatement;
-    constants: ^^AstConstantDeclaration;
-    types: ^^AstTypedDeclaration;
-    variables: ^^AstVariableDeclaration;
-    procedures: ^^AstProcedureDeclaration;
-    statements: AstCompoundStatement
-  end;
-
-(* Calls lexer_lex() but skips the comments. *)
-proc parser_lex(lexer: ^Lexer) -> LexerToken;
-var
-  result: LexerToken;
-begin
-  result := lexer_lex(lexer);
-
-  while result.kind = lexerKindComment do
-    result := lexer_lex(lexer)
-  end;
-
-  return result
-end;
-
-proc parse_type_fields(parser: ^Parser) -> ^AstFieldDeclaration;
-var
-  token: LexerToken;
-  field_declarations: ^AstFieldDeclaration;
-  field_count: Word;
-  current_field: ^AstFieldDeclaration;
-begin
-  field_declarations := malloc(#size(AstFieldDeclaration));
-  token := parser_lex(parser^.lexer);
-  field_count := 0;
-
-  while token.kind <> lexerKindEnd do
-    field_count := field_count + 2u;
-
-    field_declarations := realloc(field_declarations, #size(AstFieldDeclaration) * field_count);
-    field_count := field_count - 1u;
-    current_field := field_declarations + (field_count - 1u);
-
-    token := parser_lex(parser^.lexer);
-
-    current_field^.field_name := token.identifierKind;
-
-    token := parser_lex(parser^.lexer);
-    current_field^.field_type := parse_type_expression(parser);
-    token := parser_lex(parser^.lexer);
-
-    if token.kind = lexerKindSemicolon then
-      token := parser_lex(parser^.lexer)
-    end
-  end;
-  current_field := current_field + 1;
-  memset(current_field, 0, #size(AstFieldDeclaration));
-
-  return field_declarations
-end;
-
-proc parse_record_type(parser: ^Parser) -> ^AstTypeExpression;
-var
-  result: ^AstTypeExpression;
-begin
-  NEW(result);
-  result^.kind := AstTypeExpressionKind.record_expression;
-  result^.fields := parse_type_fields(parser);
-
-  return result
-end;
-
-proc parse_pointer_type(parser: ^Parser) -> ^AstTypeExpression;
-var
-  token: LexerToken;
-  result: ^AstTypeExpression;
-begin
-  NEW(result);
-  result^.kind := AstTypeExpressionKind.pointer_expression;
-
-  token := lexer_current(parser^.lexer);
-
-  if token.kind = lexerKindPointer then
-    token := parser_lex(parser^.lexer)
-  end;
-  token := lexer_current(parser^.lexer);
-  result^.target := parse_type_expression(parser);
-
-  return result
-end;
-
-proc parse_array_type(parser: ^Parser) -> ^AstTypeExpression;
-var
-  token: LexerToken;
-  buffer: [20]Char;
-  result: ^AstTypeExpression;
-begin
-  NEW(result);
-  result^.kind := AstTypeExpressionKind.array_expression;
-  result^.array_expression.length := 0u;
-
-  token := lexer_current(parser^.lexer);
-
-  if token.kind = lexerKindArray then
-    token := parser_lex(parser^.lexer)
-  end;
-  if token.kind <> lexerKindOf then
-    token := parser_lex(parser^.lexer);
-
-    result^.array_expression.length := token.integerKind;
-
-    token := parser_lex(parser^.lexer)
-  end;
-  token := parser_lex(parser^.lexer);
-  result^.array_expression.base := parse_type_expression(parser);
-
-  return result
-end;
-
-proc parse_enumeration_type(parser: ^Parser) -> ^AstTypeExpression;
-var
-  token: LexerToken;
-  result: ^AstTypeExpression;
-  current_case: ^Identifier;
-  case_count: Word;
-begin
-  NEW(result);
-  result^.kind := AstTypeExpressionKind.enumeration_expression;
-
-  case_count := 1u;
-  result^.cases := malloc(#size(Identifier) * 2);
-  token := parser_lex(parser^.lexer);
-  current_case := result^.cases;
-  current_case^ := token.identifierKind;
-
-  token := parser_lex(parser^.lexer);
-
-  while token.kind = lexerKindComma do
-    token := parser_lex(parser^.lexer);
-
-    case_count := case_count + 2u;
-
-    result^.cases := realloc(result^.cases, #size(Identifier) * case_count);
-    case_count := case_count - 1u;
-    current_case := result^.cases + (case_count - 1u);
-    current_case^ := token.identifierKind;
-
-    token := parser_lex(parser^.lexer)
-  end;
-  current_case := current_case + 1;
-  memset(current_case, 0, #size(Identifier));
-
-  return result
-end;
-
-proc parse_named_type(parser: ^Parser) -> ^AstTypeExpression;
-var
-  token: LexerToken;
-  result: ^AstTypeExpression;
-begin
-  token := lexer_current(parser^.lexer);
-  NEW(result);
-
-  result^.kind := AstTypeExpressionKind.named_expression;
-  result^.name := token.identifierKind;
-
-  return result
-end;
-
-proc parse_procedure_type(parser: ^Parser) -> ^AstTypeExpression;
-var
-  token: LexerToken;
-  result: ^AstTypeExpression;
-  current_parameter: ^^AstTypeExpression;
-  parameter_count: Word;
-begin
-  parameter_count := 0u;
-  NEW(result);
-  result^.kind := AstTypeExpressionKind.procedure_expression;
-
-  result^.parameters := malloc(#size(^AstTypeExpression));
-
-  token := parser_lex(parser^.lexer);
-  token := parser_lex(parser^.lexer);
-
-  while token.kind <> lexerKindRightParen do
-    parameter_count := parameter_count + 2u;
-
-    result^.parameters := realloc(result^.parameters, #size(^AstTypeExpression) * parameter_count);
-    parameter_count := parameter_count - 1u;
-    current_parameter := result^.parameters + (parameter_count - 1u);
-
-    current_parameter^ := parse_type_expression(parser);
-
-    token := parser_lex(parser^.lexer);
-    if token.kind = lexerKindComma then
-      token := parser_lex(parser^.lexer)
-    end
-  end;
-  current_parameter := result^.parameters + parameter_count;
-  current_parameter^ := nil;
-
-  return result
-end;
-
-proc parse_type_expression(parser: ^Parser) -> ^AstTypeExpression;
-var
-  token: LexerToken;
-  result: ^AstTypeExpression;
-begin
-  result := nil;
-  token := lexer_current(parser^.lexer);
-
-  if token.kind = lexerKindRecord then
-    result := parse_record_type(parser)
-  end;
-  if token.kind = lexerKindLeftParen then
-    result := parse_enumeration_type(parser)
-  end;
-  if (token.kind = lexerKindArray) or (token.kind = lexerKindLeftSquare) then
-    result := parse_array_type(parser)
-  end;
-  if token.kind = lexerKindHat then
-    result := parse_pointer_type(parser)
-  end;
-  if token.kind = lexerKindProc then
-    result := parse_procedure_type(parser)
-  end;
-  if token.kind = lexerKindIdentifier then
-    result := parse_named_type(parser)
-  end;
-  return result
-end;
-
-proc parse_type_declaration(parser: ^Parser) -> ^AstTypedDeclaration;
-var
-  token: LexerToken;
-  result: ^AstTypedDeclaration;
-begin
-  token := lexer_current(parser^.lexer);
-
-  NEW(result);
-  result^.identifier := token.identifierKind;
-
-  token := parser_lex(parser^.lexer);
-  token := parser_lex(parser^.lexer);
-
-  result^.type_expression := parse_type_expression(parser);
-  token := parser_lex(parser^.lexer);
-
-  return result
-end;
-
-proc parse_type_part(parser: ^Parser) -> ^^AstTypedDeclaration;
-var
-  token: LexerToken;
-  result: ^^AstTypedDeclaration;
-  current_declaration: ^^AstTypedDeclaration;
-  declaration_count: Word;
-begin
-  token := lexer_current(parser^.lexer);
-
-  result := malloc(#size(^AstTypedDeclaration));
-  current_declaration := result;
-  declaration_count := 0u;
-
-  if token.kind = lexerKindType then
-    token := parser_lex(parser^.lexer);
-
-    while token.kind = lexerKindIdentifier do
-      declaration_count := declaration_count + 1u;
-
-      result := realloc(result, #size(^AstTypedDeclaration) * (declaration_count + 1));
-      current_declaration := result + (declaration_count - 1u);
-
-      current_declaration^ := parse_type_declaration(parser);
-      token := parser_lex(parser^.lexer)
-    end
-  end;
-  if declaration_count <> 0u then
-    current_declaration := current_declaration + 1
-  end;
-  current_declaration^ := nil;
-
-  return result
-end;
-
-proc parse_variable_declaration(parser: ^Parser) -> ^AstVariableDeclaration;
-var
-  token: LexerToken;
-  result: ^AstVariableDeclaration;
-begin
-  NEW(result);
-
-  token := lexer_current(parser^.lexer);
-  result^.variable_name := token.identifierKind;
-
-  token := parser_lex(parser^.lexer);
-
-  token := parser_lex(parser^.lexer);
-  result^.variable_type := parse_type_expression(parser);
-
-  token := parser_lex(parser^.lexer);
-  return result
-end;
-
-proc parse_variable_part(parser: ^Parser) -> ^^AstVariableDeclaration;
-var
-  token: LexerToken;
-  result: ^^AstVariableDeclaration;
-  current_declaration: ^^AstVariableDeclaration;
-  declaration_count: Word;
-begin
-  token := lexer_current(parser^.lexer);
-
-  result := malloc(#size(^AstVariableDeclaration));
-  current_declaration := result;
-  declaration_count := 0u;
-
-  if token.kind = lexerKindVar then
-    token := parser_lex(parser^.lexer);
-
-    while token.kind = lexerKindIdentifier do
-      declaration_count := declaration_count + 1u;
-
-      result := realloc(result, #size(^AstVariableDeclaration) * (declaration_count + 1));
-      current_declaration := result + (declaration_count - 1u);
-
-      current_declaration^ := parse_variable_declaration(parser);
-      token := parser_lex(parser^.lexer)
-    end
-  end;
-  if declaration_count <> 0 then
-    current_declaration := current_declaration + 1
-  end;
-  current_declaration^ := nil;
-
-  return result
-end;
-
-proc parse_constant_declaration(parser: ^Parser) -> ^AstConstantDeclaration;
-var
-  token: LexerToken;
-  result: ^AstConstantDeclaration;
-begin
-  NEW(result);
-
-  token := lexer_current(parser^.lexer);
-  result^.constant_name := token.identifierKind;
-
-  token := parser_lex(parser^.lexer);
-
-  token := parser_lex(parser^.lexer);
-  result^.constant_value := token.integerKind;
-
-  token := parser_lex(parser^.lexer);
-
-  return result
-end;
-
-proc parse_constant_part(parser: ^Parser) -> ^^AstConstantDeclaration;
-var
-  token: LexerToken;
-  result: ^^AstConstantDeclaration;
-  current_declaration: ^^AstConstantDeclaration;
-  declaration_count: Word;
-begin
-  token := lexer_current(parser^.lexer);
-
-  result := malloc(#size(^AstConstantDeclaration));
-  current_declaration := result;
-  declaration_count := 0u;
-
-  if token.kind = lexerKindConst then
-    token := parser_lex(parser^.lexer);
-
-    while token.kind = lexerKindIdentifier do
-      declaration_count := declaration_count + 1u;
-
-      result := realloc(result, #size(^AstConstantDeclaration) * (declaration_count + 1u));
-      current_declaration := result + (declaration_count - 1u);
-
-      current_declaration^ := parse_constant_declaration(parser);
-      token := parser_lex(parser^.lexer)
-    end
-  end;
-  if declaration_count <> 0 then
-    current_declaration := current_declaration + 1
-  end;
-  current_declaration^ := nil;
-
-  return result
-end;
-
-proc parse_import_statement(parser: ^Parser) -> ^AstImportStatement;
-var
-  result: ^AstImportStatement;
-  token: LexerToken;
-  symbol_count: Word;
-  current_symbol: ^Identifier;
-begin
-  NEW(result);
-  symbol_count := 1u;
-
-  token := parser_lex(parser^.lexer);
-  result^.package := token.identifierKind;
-
-  token := parser_lex(parser^.lexer);
-  result^.symbols := malloc(#size(Identifier) * 2);
-
-  current_symbol := result^.symbols;
-
-  token := parser_lex(parser^.lexer);
-  current_symbol^ := token.identifierKind;
-
-  token := parser_lex(parser^.lexer);
-  while token.kind <> lexerKindSemicolon do
-    token := parser_lex(parser^.lexer);
-    symbol_count := symbol_count + 1u;
-
-    result^.symbols := realloc(result^.symbols, #size(Identifier) * (symbol_count + 1u));
-    current_symbol := result^.symbols + (symbol_count - 1u);
-
-    current_symbol^ := token.identifierKind;
-    token := parser_lex(parser^.lexer)
-  end;
-  current_symbol := current_symbol + 1;
-  memset(current_symbol, 0, #size(Identifier));
-
-  token := parser_lex(parser^.lexer);
-
-  return result
-end;
-
-proc parse_import_part(parser: ^Parser) -> ^^AstImportStatement;
-var
-  token: LexerToken;
-  import_statement: ^^AstImportStatement;
-  result: ^^AstImportStatement;
-  import_count: Word;
-begin
-  token := lexer_current(parser^.lexer);
-  result := malloc(#size(^AstImportStatement));
-  import_statement := result;
-  import_count := 0u;
-
-  while token.kind = lexerKindFrom do
-    import_count := import_count + 1u;
-
-    result := realloc(result, #size(^AstImportStatement) * (import_count + 1u));
-    import_statement := result + (import_count - 1u);
-
-    import_statement^ := parse_import_statement(parser);
-    token := lexer_current(parser^.lexer)
-  end;
-  if import_count > 0u then
-    import_statement := import_count + 1
-  end;
-  import_statement^ := nil;
-
-  return result
-end;
-
-proc parse_literal(parser: ^Parser) -> ^AstLiteral;
-var
-  literal: ^AstLiteral;
-  token: LexerToken;
-begin
-  literal := nil;
-  token := lexer_current(parser^.lexer);
-
-  if token.kind = lexerKindInteger then
-    NEW(literal);
-
-    literal^.kind := AstLiteralKind.integer;
-    literal^.integer := token.integerKind
-  end;
-  if (token.kind = lexerKindCharacter) or (token.kind = lexerKindString) then
-    NEW(literal);
-
-    literal^.kind := AstLiteralKind.string;
-    literal^.string := token.stringKind
-  end;
-  if token.kind = lexerKindNull then
-    NEW(literal);
-
-    literal^.kind := AstLiteralKind.null
-  end;
-  if token.kind = lexerKindBoolean then
-    NEW(literal);
-
-    literal^.kind := AstLiteralKind.boolean;
-    literal^.boolean := token.booleanKind
-  end;
-  if literal <> nil then
-    token := parser_lex(parser^.lexer)
-  end;
-
-  return literal
-end;
-
-proc parse_factor(parser: ^Parser) -> ^AstExpression;
-var
-  next_token: LexerToken;
-  result: ^AstExpression;
-  literal: ^AstLiteral;
-begin
-  result := nil;
-  next_token := lexer_current(parser^.lexer);
-
-  literal := parse_literal(parser);
-
-  if (result = nil) & (literal <> nil) then
-    NEW(result);
-
-    result^.kind := AstExpressionKind.literal;
-    result^.literal := literal
-  end;
-  if (result = nil) & (next_token.kind = lexerKindMinus) then
-    NEW(result);
-    next_token := parser_lex(parser^.lexer);
-
-    result^.kind := AstExpressionKind.unary;
-    result^.unary.operator := AstUnaryOperator.minus;
-    result^.unary.operand := parse_factor(parser)
-  end;
-  if (result = nil) & (next_token.kind = lexerKindTilde) then
-    NEW(result);
-    next_token := parser_lex(parser^.lexer);
-
-    result^.kind := AstExpressionKind.unary;
-    result^.unary.operator := AstUnaryOperator.not;
-    result^.unary.operand := parse_factor(parser)
-  end;
-  if (result = nil) & (next_token.kind = lexerKindLeftParen) then
-    next_token := parser_lex(parser^.lexer);
-    result := parse_expression(parser);
-    if result <> nil then
-      next_token := parser_lex(parser^.lexer)
-    end
-  end;
-  if (result = nil) & (next_token.kind = lexerKindIdentifier) then
-    NEW(result);
-
-    result^.kind := AstExpressionKind.identifier;
-    result^.identifier := next_token.identifierKind;
-
-    next_token := parser_lex(parser^.lexer)
-  end;
-
-  return result
-end;
-
-proc parse_designator(parser: ^Parser) -> ^AstExpression;
-var
-  next_token: LexerToken;
-  inner_expression: ^AstExpression;
-  designator: ^AstExpression;
-  arguments: ^^AstExpression;
-  handled: Bool;
-begin
-  designator := parse_factor(parser);
-  handled := designator <> nil;
-  next_token := lexer_current(parser^.lexer);
-
-  while handled do
-    inner_expression := designator;
-    handled := false;
-
-    if ~handled & (next_token.kind = lexerKindHat) then
-      NEW(designator);
-
-      designator^.kind := AstExpressionKind.dereference;
-      designator^.reference := inner_expression;
-
-      next_token := parser_lex(parser^.lexer);
-      handled := true
-    end;
-    if ~handled & (next_token.kind = lexerKindLeftSquare) then
-      NEW(designator);
-      next_token := parser_lex(parser^.lexer);
-
-      designator^.kind := AstExpressionKind.array_access;
-      designator^.array_access.array := inner_expression;
-      designator^.array_access.index := parse_expression(parser);
-
-      next_token := parser_lex(parser^.lexer);
-      handled := true
-    end;
-    if ~handled & (next_token.kind = lexerKindDot) then
-      NEW(designator);
-      next_token := parser_lex(parser^.lexer);
-
-      designator^.kind := AstExpressionKind.field_access;
-      designator^.field_access.aggregate := inner_expression;
-      designator^.field_access.field := next_token.identifierKind;
-
-      next_token := parser_lex(parser^.lexer);
-      handled := true
-    end;
-    if ~handled & (next_token.kind = lexerKindLeftParen) then
-      NEW(designator);
-      next_token := parser_lex(parser^.lexer);
-
-      designator^.kind := AstExpressionKind.call;
-      designator^.call.callable := inner_expression;
-      designator^.call.argument_count := 0;
-      designator^.call.arguments := nil;
-
-      if next_token.kind <> lexerKindRightParen then
-        designator^.arguments := malloc(#size(^AstExpression));
-        designator^.argument_count := 1;
-        designator^.arguments^ := parse_expression(parser);
-
-        next_token := lexer_current(parser^.lexer);
-
-        while next_token.kind = lexerKindComma do
-          next_token := parser_lex(parser^.lexer);
-
-          designator^.argument_count := designator^.argument_count + 1;
-          designator^.arguments := realloc(designator^.arguments, #size(^AstExpression) * designator^.argument_count);
-          arguments := designator^.arguments + (designator^.argument_count - 1u);
-          arguments^ := parse_expression(parser);
-
-          next_token := lexer_current(parser^.lexer)
-        end
-      end;
-
-      next_token := parser_lex(parser^.lexer);
-      handled := true
-    end
-  end;
-
-  return designator
-end;
-
-proc parse_binary_expression(parser: ^Parser, left: ^AstExpression, operator: AstBinaryOperator) -> ^AstExpression;
-var
-  next_token: LexerToken;
-  result: ^AstExpression;
-  right: ^AstExpression;
-begin
-  next_token := parser_lex(parser^.lexer);
-  right := parse_designator(parser);
-  result := nil;
-
-  if right <> nil then
-    NEW(result);
-    result^.kind := AstExpressionKind.binary;
-    result^.binary.operator := operator;
-    result^.binary.lhs := left;
-    result^.binary.rhs := right
-  end;
-
-  return result
-end;
-
-proc parse_expression(parser: ^Parser) -> ^AstExpression;
-var
-  next_token: LexerToken;
-  left: ^AstExpression;
-  result: ^AstExpression;
-  written_bytes: Word;
-begin
-  left := parse_designator(parser);
-  result := nil;
-  next_token := lexer_current(parser^.lexer);
-
-  if left <> nil then
-    if (result = nil) & (next_token.kind = lexerKindNotEqual) then
-      result := parse_binary_expression(parser, left, AstBinaryOperator.not_equals)
-    end;
-    if (result = nil) & (next_token.kind = lexerKindEqual) then
-      result := parse_binary_expression(parser, left, AstBinaryOperator.equals)
-    end;
-    if (result = nil) & (next_token.kind = lexerKindGreaterThan) then
-      result := parse_binary_expression(parser, left, AstBinaryOperator.greater)
-    end;
-    if (result = nil) & (next_token.kind = lexerKindLessThan) then
-      result := parse_binary_expression(parser, left, AstBinaryOperator.less)
-    end;
-    if (result = nil) & (next_token.kind = lexerKindGreaterEqual) then
-      result := parse_binary_expression(parser, left, AstBinaryOperator.greater_equal)
-    end;
-    if (result = nil) & (next_token.kind = lexerKindLessEqual) then
-      result := parse_binary_expression(parser, left, AstBinaryOperator.less_equal)
-    end;
-    if (result = nil) & (next_token.kind = lexerKindAnd) then
-      result := parse_binary_expression(parser, left, AstBinaryOperator.conjunction)
-    end;
-    if (result = nil) & (next_token.kind = lexerKindOr) then
-      result := parse_binary_expression(parser, left, AstBinaryOperator.disjunction)
-    end;
-    if (result = nil) & (next_token.kind = lexerKindMinus) then
-      result := parse_binary_expression(parser, left, AstBinaryOperator.subtraction)
-    end;
-    if (result = nil) & (next_token.kind = lexerKindPlus) then
-      result := parse_binary_expression(parser, left, AstBinaryOperator.sum)
-    end;
-    if (result = nil) & (next_token.kind = lexerKindAsterisk) then
-      result := parse_binary_expression(parser, left, AstBinaryOperator.multiplication)
-    end
-  end;
-  if (result = nil) & (left <> nil) then
-    result := left
-  end;
-
-  return result
-end;
-
-proc parse_return_statement(parser: ^Parser) -> ^AstStatement;
-var
-  token: LexerToken;
-  result: ^AstStatement;
-begin
-  NEW(result);
-  result^.kind := AstStatementKind.return_statement;
-
-  token := parser_lex(parser^.lexer);
-  result^.return_statement := parse_expression(parser);
-
-  return result
-end;
-
-proc parse_assignment_statement(parser: ^Parser, assignee: ^AstExpression) -> ^AstStatement;
-var
-  token: LexerToken;
-  result: ^AstStatement;
-begin
-  NEW(result);
-  result^.kind := AstStatementKind.assignment_statement;
-  result^.assignment_statement.assignee := assignee;
-
-  token := parser_lex(parser^.lexer);
-  result^.assignment_statement.assignment := parse_expression(parser);
-
-  return result
-end;
-
-proc parse_call_statement(parser: ^Parser, call: ^AstExpression) -> ^AstStatement;
-var
-  result: ^AstStatement;
-begin
-  NEW(result);
-  result^.kind := AstStatementKind.call_statement;
-  result^.call_statement := call;
-
-  return result
-end;
-
-proc parse_compound_statement(parser: ^Parser) -> AstCompoundStatement;
-var
-  result: AstCompoundStatement;
-  token: LexerToken;
-  current_statement: ^^AstStatement;
-  old_count: Word;
-begin
-  result.count := 0u;
-  result.statements := nil;
-
-  token := lexer_current(parser^.lexer);
-
-  while token.kind <> lexerKindEnd do
-    old_count := result.count;
-    result.count := result.count + 1u;
-
-    result.statements := realloc(result.statements, #size(^AstStatement) * result.count);
-    current_statement := result.statements + old_count;
-
-    current_statement^ := parse_statement(parser);
-
-    token := lexer_current(parser^.lexer)
-  end;
-
-  return result
-end;
-
-proc parse_statement(parser: ^Parser) -> ^AstStatement;
-var
-  token: LexerToken;
-  statement: ^AstStatement;
-  designator: ^AstExpression;
-begin
-  statement := nil;
-  token := parser_lex(parser^.lexer);
-
-  if token.kind = lexerKindIf then
-    statement := parse_if_statement(parser)
-  end;
-  if token.kind = lexerKindWhile then
-    statement := parse_while_statement(parser)
-  end;
-  if token.kind = lexerKindReturn then
-    statement := parse_return_statement(parser)
-  end;
-  if token.kind = lexerKindIdentifier then
-    designator := parse_designator(parser);
-    token := lexer_current(parser^.lexer);
-
-    if token.kind = lexerKindAssignment then
-      statement := parse_assignment_statement(parser, designator)
-    end;
-    if token.kind <> lexerKindAssignment then
-      statement := parse_call_statement(parser, designator)
-    end
-  end;
-  return statement
-end;
-
-proc parse_if_statement(parser: ^Parser) -> ^AstStatement;
-var
-  token: LexerToken;
-  result: ^AstStatement;
-begin
-  NEW(result);
-  result^.kind := AstStatementKind.if_statement;
-
-  token := parser_lex(parser^.lexer);
-  result^.if_statement.condition := parse_expression(parser);
-  result^.if_statement.branch := parse_compound_statement(parser);
-
-  token := parser_lex(parser^.lexer);
-  return result
-end;
-
-proc parse_while_statement(parser: ^Parser) -> ^AstStatement;
-var
-  token: LexerToken;
-  result: ^AstStatement;
-begin
-  NEW(result);
-  result^.kind := AstStatementKind.while_statement;
-
-  token := parser_lex(parser^.lexer);
-  result^.while_statement.condition := parse_expression(parser);
-  result^.while_statement.body := parse_compound_statement(parser);
-
-  token := parser_lex(parser^.lexer);
-  return result
-end;
-
-proc parse_statement_part(parser: ^Parser) -> AstCompoundStatement;
-var
-  token: LexerToken;
-  compound: AstCompoundStatement;
-begin
-  compound.count := 0;
-  compound.statements := nil;
-  token := lexer_current(parser^.lexer);
-
-  if token.kind = lexerKindBegin then
-    compound := parse_compound_statement(parser)
-  end;
-
-  return compound
-end;
-
-proc parse_procedure_heading(parser: ^Parser) -> ^AstProcedureDeclaration;
-var
-  token: LexerToken;
-  declaration: ^AstProcedureDeclaration;
-  parameter_index: Word;
-  current_parameter: ^AstTypedDeclaration;
-begin
-  NEW(declaration);
-
-  token := parser_lex(parser^.lexer);
-  declaration^.name := token.identifierKind;
-
-  token := parser_lex(parser^.lexer);
-
-  declaration^.parameters := nil;
-  declaration^.parameter_count := 0u;
-
-  token := parser_lex(parser^.lexer);
-  while token.kind <> lexerKindRightParen do
-    parameter_index := declaration^.parameter_count;
-    declaration^.parameter_count := declaration^.parameter_count + 1;
-    declaration^.parameters := realloc(declaration^.parameters, #size(AstTypedDeclaration) * declaration^.parameter_count);
-
-    current_parameter := declaration^.parameters + parameter_index;
-
-    current_parameter^.identifier := token.identifierKind;
-
-    token := parser_lex(parser^.lexer);
-    token := parser_lex(parser^.lexer);
-
-    current_parameter^.type_expression := parse_type_expression(parser);
-
-    token := parser_lex(parser^.lexer);
-    if token.kind = lexerKindComma then
-      token := parser_lex(parser^.lexer)
-    end
-  end;
-  token := parser_lex(parser^.lexer);
-  declaration^.return_type := nil;
-
-  (* Check for the return type and write it. *)
-  if token.kind = lexerKindArrow then
-    token := parser_lex(parser^.lexer);
-    declaration^.return_type := parse_type_expression(parser);
-    token := parser_lex(parser^.lexer)
-  end;
-  token := parser_lex(parser^.lexer);
-
-  return declaration
-end;
-
-proc parse_procedure_declaration(parser: ^Parser) -> ^AstProcedureDeclaration;
-var
-  token: LexerToken;
-  declaration: ^AstProcedureDeclaration;
-begin
-  declaration := parse_procedure_heading(parser);
-
-  declaration^.constants := parse_constant_part(parser);
-  declaration^.variables := parse_variable_part(parser);
-  declaration^.statements := parse_statement_part(parser);
-
-  token := parser_lex(parser^.lexer);
-  token := parser_lex(parser^.lexer);
-
-  return declaration
-end;
-
-proc parse_procedure_part(parser: ^Parser) -> ^^AstProcedureDeclaration;
-var
-  token: LexerToken;
-  current_declaration: ^^AstProcedureDeclaration;
-  result: ^^AstProcedureDeclaration;
-  declaration_count: Word;
-  declaration_index: Word;
-begin
-  token := lexer_current(parser^.lexer);
-  declaration_count := 0u;
-  declaration_index := 0u;
-
-  result := malloc(#size(^AstProcedureDeclaration));
-
-  while token.kind = lexerKindProc do
-    declaration_count := declaration_count + 1u;
-    result := realloc(result, #size(^AstProcedureDeclaration) * (declaration_count + 1));
-    current_declaration := result + declaration_index;
-
-    current_declaration^ := parse_procedure_declaration(parser);
-    token := lexer_current(parser^.lexer);
-    declaration_index := declaration_count
-  end;
-  current_declaration := result + declaration_index;
-  current_declaration^ := nil;
-
-  return result
-end;
-
-proc parse_module(parser: ^Parser) -> ^AstModule;
-var
-  token: LexerToken;
-  result: ^AstModule;
-begin
-  NEW(result);
-  token := parser_lex(parser^.lexer);
-  result^.main := true;
-
-  if token.kind = lexerKindModule then
-    result^.main := false
-  end;
-  token := parser_lex(parser^.lexer);
-
-  (* Write the module body. *)
-  token := parser_lex(parser^.lexer);
-
-  result^.imports := parse_import_part(parser);
-  result^.constants := parse_constant_part(parser);
-  result^.types := parse_type_part(parser);
-
-  result^.variables := parse_variable_part(parser);
-  result^.procedures := parse_procedure_part(parser);
-  result^.statements := parse_statement_part(parser);
-
-  token := parser_lex(parser^.lexer);
-  token := parser_lex(parser^.lexer);
-
-  return result
-end;
-
-proc parse*(lexer: ^Lexer) -> ^AstModule;
-var
-  parser: Parser;
-begin
-  parser.lexer := lexer;
-
-  return parse_module(@parser)
-end;
-
-end.
diff --git a/source/cctype.elna b/source/cctype.elna
deleted file mode 100644
index 3906cd1..0000000
--- a/source/cctype.elna
+++ /dev/null
@@ -1,14 +0,0 @@
-(* This Source Code Form is subject to the terms of the Mozilla Public License,
-  v. 2.0. If a copy of the MPL was not distributed with this file, You can
-  obtain one at https://mozilla.org/MPL/2.0/. *)
-module;
-
-proc isdigit*(c: Int ) -> Int; extern;
-proc isalnum*(c: Int) -> Int; extern;
-proc isalpha*(c: Int) -> Int; extern;
-proc isspace*(c: Int) -> Int; extern;
-
-proc tolower*(c: Int) -> Int; extern;
-proc toupper*(c: Int) -> Int; extern;
-
-end.
diff --git a/source/command_line_interface.elna b/source/command_line_interface.elna
deleted file mode 100644
index 040fdeb..0000000
--- a/source/command_line_interface.elna
+++ /dev/null
@@ -1,93 +0,0 @@
-(* This Source Code Form is subject to the terms of the Mozilla Public License,
-  v. 2.0. If a copy of the MPL was not distributed with this file, You can
-  obtain one at https://mozilla.org/MPL/2.0/. *)
-
-(*
-  Command line handling.
-*)
-module;
-
-import cstdlib, cstring, common;
-
-type
-  CommandLine* = record
-    input: ^Char;
-    output: ^Char;
-    lex: Bool;
-    parse: Bool
-  end;
-
-proc parse_command_line*(argc: Int, argv: ^^Char) -> ^CommandLine;
-var
-  parameter: ^Char;
-  i: Int;
-  result: ^CommandLine;
-  parsed: Bool;
-begin
-  i := 1;
-  result := cast(malloc(#size(CommandLine)): ^CommandLine);
-  result^.lex := false;
-  result^.parse := false;
-  result^.input := nil;
-  result^.output := nil;
-
-  while i < argc & result <> nil do
-    parameter := (argv + i)^;
-    parsed := false;
-
-    if strcmp(parameter, "--lex\0".ptr) = 0 then
-      parsed := true;
-      result^.lex := true
-    end;
-    if strcmp(parameter, "--parse\0".ptr) = 0 then
-      parsed := true;
-      result^.parse := true
-    end;
-    if strcmp(parameter, "-o\0".ptr) = 0 then
-      i := i + 1;
-
-      if i = argc then
-        write_s("Fatal error: expecting a file name following -o.");
-        result := nil
-      end;
-      if i < argc then
-        parameter := (argv + i)^;
-        result^.output := parameter
-      end;
-      parsed := true
-    end;
-    if (parameter^ <> '-') & ~parsed then
-      parsed := true;
-
-      if result^.input <> nil then
-        write_s("Fatal error: only one source file can be compiled at once. First given \"");
-        write_z(result^.input);
-        write_s("\", then \"");
-        write_z(parameter);
-        write_s("\".\n");
-        result := nil
-      end;
-      if result <> nil then
-        result^.input := parameter
-      end
-    end;
-    if ~parsed then
-      write_s("Fatal error: unknown command line options: ");
-
-      write_z(parameter);
-      write_s(".\n");
-
-      result := nil
-    end;
-
-    i := i + 1
-  end;
-  if result <> nil & result^.input = nil then
-    write_s("Fatal error: no input files.\n");
-    result := nil
-  end;
-
-  return result
-end;
-
-end.
diff --git a/source/common.elna b/source/common.elna
deleted file mode 100644
index e7b30ca..0000000
--- a/source/common.elna
+++ /dev/null
@@ -1,72 +0,0 @@
-(* This Source Code Form is subject to the terms of the Mozilla Public License,
-  v. 2.0. If a copy of the MPL was not distributed with this file, You can
-  obtain one at https://mozilla.org/MPL/2.0/. *)
-module;
-
-import cstring, cstdio;
-
-type
-  Identifier = [256]Char;
-  TextLocation* = record
-    line: Word;
-    column: Word
-  end;
-
-proc write*(fd: Int, buf: Pointer, Word: Int) -> Int; extern;
-
-proc write_s*(value: String);
-begin
-  (* fwrite(cast(value.ptr: Pointer), value.length, 1u, stdout) *)
-  write(1, cast(value.ptr: Pointer), cast(value.length: Int))
-end;
-
-proc write_z*(value: ^Char);
-begin
-  write(1, cast(value: Pointer), cast(strlen(value): Int))
-end;
-
-proc write_b*(value: Bool);
-begin
-  if value then
-    write_s("true")
-  else
-    write_s("false")
-  end
-end;
-
-proc write_c*(value: Char);
-begin
-  putchar(cast(value: Int));
-  fflush(nil)
-end;
-
-proc write_i*(value: Int);
-var
-  digit: Int;
-  n: Word;
-  buffer: [10]Char;
-begin
-  n := 10u;
-
-  if value = 0 then
-    write_c('0')
-  end;
-  while value <> 0 do
-    digit := value % 10;
-    value := value / 10;
-
-    buffer[n] := cast(cast('0': Int) + digit: Char);
-    n := n - 1u
-  end;
-  while n < 10u do
-    n := n + 1u;
-    write_c(buffer[n])
-  end
-end;
-
-proc write_u*(value: Word);
-begin
-  write_i(cast(value: Int))
-end;
-
-end.
diff --git a/source/cstdio.elna b/source/cstdio.elna
deleted file mode 100644
index c7507ff..0000000
--- a/source/cstdio.elna
+++ /dev/null
@@ -1,29 +0,0 @@
-(* This Source Code Form is subject to the terms of the Mozilla Public License,
-  v. 2.0. If a copy of the MPL was not distributed with this file, You can
-  obtain one at https://mozilla.org/MPL/2.0/. *)
-module;
-
-type
-  FILE* = record end;
-
-var
-  stdin*: ^FILE := extern;
-  stdout*: ^FILE := extern;
-  stderr*: ^FILE := extern;
-
-proc fopen*(pathname: ^Char, mode: ^Char) -> ^FILE; extern;
-proc fclose*(stream: ^FILE) -> Int; extern;
-proc fseek*(stream: ^FILE, off: Int, whence: Int) -> Int; extern;
-proc rewind*(stream: ^FILE); extern;
-proc ftell*(stream: ^FILE) -> Int; extern;
-proc fflush*(stream: ^FILE) -> Int; extern;
-
-proc fread*(ptr: Pointer, size: Word, nmemb: Word, stream: ^FILE) -> Word; extern;
-proc fwrite*(ptr: Pointer, size: Word, nitems: Word, stream: ^FILE) -> Word; extern;
-
-proc perror(s: ^Char); extern;
-
-proc puts(s: ^Char) -> Int; extern;
-proc putchar(c: Int) -> Int; extern;
-
-end.
diff --git a/source/cstdlib.elna b/source/cstdlib.elna
deleted file mode 100644
index da2029c..0000000
--- a/source/cstdlib.elna
+++ /dev/null
@@ -1,15 +0,0 @@
-(* This Source Code Form is subject to the terms of the Mozilla Public License,
-  v. 2.0. If a copy of the MPL was not distributed with this file, You can
-  obtain one at https://mozilla.org/MPL/2.0/. *)
-module;
-
-proc malloc(size: Word) -> Pointer; extern;
-proc free(ptr: Pointer); extern;
-proc calloc(nmemb: Word, size: Word) -> Pointer; extern;
-proc realloc(ptr: Pointer, size: Word) -> Pointer; extern;
-
-proc atoi(str: ^Char) -> Int; extern;
-
-proc exit(code: Int) -> !; extern;
-
-end.
diff --git a/source/cstring.elna b/source/cstring.elna
deleted file mode 100644
index 24d852a..0000000
--- a/source/cstring.elna
+++ /dev/null
@@ -1,15 +0,0 @@
-(* This Source Code Form is subject to the terms of the Mozilla Public License,
-  v. 2.0. If a copy of the MPL was not distributed with this file, You can
-  obtain one at https://mozilla.org/MPL/2.0/. *)
-module;
-
-proc memset(ptr: Pointer, c: Int, n: Word) -> ^Char; extern;
-proc memcpy(dst: Pointer, src: Pointer, n: Word); extern;
-
-proc strcmp(s1: ^Char, s2: ^Char) -> Int; extern;
-proc strncmp(s1: ^Char, s2: ^Char, n: Word) -> Int; extern;
-proc strncpy(dst: ^Char, src: ^Char, dsize: Word) -> ^Char; extern;
-proc strcpy(dst: ^Char, src: ^Char) -> ^Char; extern;
-proc strlen(ptr: ^Char) -> Word; extern;
-
-end.
diff --git a/source/main.elna b/source/main.elna
deleted file mode 100644
index dae045b..0000000
--- a/source/main.elna
+++ /dev/null
@@ -1,841 +0,0 @@
-(* This Source Code Form is subject to the terms of the Mozilla Public License,
-  v. 2.0. If a copy of the MPL was not distributed with this file, You can
-  obtain one at https://mozilla.org/MPL/2.0/. *)
-program;
-
-import cstdio, cctype, common, command_line_interface, lexer;
-
-type
-  SourceFile* = record
-    buffer: [1024]Char;
-    handle: ^FILE;
-    size: Word;
-    index: Word
-  end;
-  StringBuffer* = record
-    data: Pointer;
-    size: Word;
-    capacity: Word
-  end;
-  SourceCode = record
-    position: TextLocation;
-
-    input: Pointer;
-    empty: proc(Pointer) -> Bool;
-    advance: proc(Pointer);
-    head: proc(Pointer) -> Char
-  end;
-  Token* = record
-    kind: LexerKind;
-    value: union
-      int_value: Int;
-      string: String;
-      boolean_value: Bool;
-      char_value: Char
-    end
-  end;
-  Tokenizer* = record
-    length: Word;
-    data: ^Token
-  end;
-
-(*
-  Standard procedures.
-*)
-proc reallocarray(ptr: Pointer, n: Word, size: Word) -> Pointer;
-  return realloc(ptr, n * size)
-end;
-
-proc substring(string: String, start: Word, count: Word) -> String;
-  return String(string.ptr + start, count)
-end;
-
-proc open_substring(string: String, start: Word) -> String;
-  return substring(string, start, string.length - start)
-end;
-
-proc string_dup(origin: String) -> String;
-var
-  copy: ^Char;
-begin
-  copy := cast(malloc(origin.length): ^Char);
-  strncpy(copy, origin.ptr, origin.length);
-
-  return String(copy, origin.length)
-end;
-
-proc string_buffer_new() -> StringBuffer;
-var
-  result: StringBuffer;
-begin
-  result.capacity := 64u;
-  result.data := malloc(result.capacity);
-  result.size := 0u;
-
-  return result
-end;
-
-proc string_buffer_push(buffer: ^StringBuffer, char: Char);
-begin
-  if buffer^.size >= buffer^.capacity then
-    buffer^.capacity := buffer^.capacity + 1024u;
-    buffer^.data := realloc(buffer^.data, buffer^.capacity)
-  end;
-  cast(buffer^.data + buffer^.size: ^Char)^ := cast(char: Char);
-  buffer^.size := buffer^.size + 1u
-end;
-
-proc string_buffer_pop(buffer: ^StringBuffer, count: Word);
-begin
-  buffer^.size := buffer^.size - count
-end;
-
-proc string_buffer_clear(buffer: ^StringBuffer) -> String;
-var
-  result: String;
-begin
-  result := String(cast(buffer^.data: ^Char), buffer^.size);
-  buffer^.size := 0u;
-  return result
-end;
-
-(*
-  Source code stream procedures.
-*)
-
-proc read_source(filename: ^Char) -> ^SourceFile;
-var
-  result: ^SourceFile;
-  file_handle: ^FILE;
-begin
-  file_handle := fopen(filename, "rb\0".ptr);
-
-  if file_handle <> nil then
-    result := cast(malloc(#size(SourceFile)): ^SourceFile);
-    result^.handle := file_handle;
-    result^.size := 0u;
-    result^.index := 1u
-  end;
-  return result
-end;
-
-proc source_file_empty(source_input: Pointer) -> Bool;
-var
-  source_file: ^SourceFile;
-begin
-  source_file := cast(source_input: ^SourceFile);
-
-  if source_file^.index > source_file^.size then
-    source_file^.size := fread(cast(@source_file^.buffer: Pointer), 1u, 1024u, source_file^.handle);
-    source_file^.index := 1u
-  end;
-
-  return source_file^.size = 0u
-end;
-
-proc source_file_head(source_input: Pointer) -> Char;
-var
-  source_file: ^SourceFile;
-begin
-  source_file := cast(source_input: ^SourceFile);
-
-  return source_file^.buffer[source_file^.index]
-end;
-
-proc source_file_advance(source_input: Pointer);
-var
-  source_file: ^SourceFile;
-begin
-  source_file := cast(source_input: ^SourceFile);
-
-  source_file^.index := source_file^.index + 1u
-end;
-
-proc source_code_empty(source_code: ^SourceCode) -> Bool;
-  return source_code^.empty(source_code^.input)
-end;
-
-proc source_code_head(source_code: SourceCode) -> Char;
-  return source_code.head(source_code.input)
-end;
-
-proc source_code_advance(source_code: ^SourceCode);
-begin
-  source_code^.advance(source_code^.input);
-  source_code^.position.column := source_code^.position.column
-end;
-
-proc source_code_break(source_code: ^SourceCode);
-begin
-  source_code^.position.line := source_code^.position.line + 1u;
-  source_code^.position.column := 0u
-end;
-
-proc source_code_expect(source_code: ^SourceCode, expected: Char) -> Bool;
-  return ~source_code_empty(source_code) & source_code_head(source_code^) = expected
-end;
-
-(*
-  Token procedures.
-*)
-
-proc lexer_escape(escape: Char, result: ^Char) -> Bool;
-var
-  successful: Bool;
-begin
-  case escape of
-    'n':
-      result^ := '\n';
-      successful := true
-    | 'a':
-      result^ := '\a';
-      successful := true
-    | 'b':
-      result^ := '\b';
-      successful := true
-    | 't':
-      result^ := '\t';
-      successful := true
-    | 'f':
-      result^ := '\f';
-      successful := true
-    | 'r':
-      result^ := '\r';
-      successful := true
-    | 'v':
-      result^ := '\v';
-      successful := true
-    | '\\':
-      result^ := '\\';
-      successful := true
-    | '\'':
-      result^ := '\'';
-      successful := true
-    | '"':
-      result^ := '"';
-      successful := true
-    | '?':
-      result^ := '\?';
-      successful := true
-    | '0':
-      result^ := '\0';
-      successful := true
-    else
-      successful := false
-  end;
-  return successful
-end;
-
-(* Skip spaces. *)
-proc lexer_spaces(source_code: ^SourceCode);
-var
-  current: Char;
-begin
-  while ~source_code_empty(source_code) & isspace(cast(source_code_head(source_code^): Int)) <> 0 do
-    current := source_code_head(source_code^);
-
-    if current = '\n' then
-      source_code_break(source_code)
-    end;
-    source_code_advance(source_code)
-  end
-end;
-
-(* Checker whether the character is allowed in an identificator. *)
-proc lexer_is_ident(char: Char) -> Bool;
-  return isalnum(cast(char: Int)) <> 0 or char = '_'
-end;
-
-proc lexer_identifier(source_code: ^SourceCode, token_content: ^StringBuffer);
-var
-  content_length: Word;
-begin
-  while ~source_code_empty(source_code) & lexer_is_ident(source_code_head(source_code^)) do
-    string_buffer_push(token_content, source_code_head(source_code^));
-    source_code_advance(source_code)
-  end
-end;
-
-proc lexer_comment(source_code: ^SourceCode, token_content: ^StringBuffer) -> Bool;
-var
-  trailing: Word;
-begin
-  trailing := 0u;
-
-  while ~source_code_empty(source_code) & trailing < 2u do
-    if source_code_head(source_code^) = '*' then
-      string_buffer_push(token_content, '*');
-      trailing := 1u
-    elsif source_code_head(source_code^) = ')' & trailing = 1u then
-      string_buffer_pop(token_content, 1u);
-      trailing := 2u
-    else
-      string_buffer_push(token_content, source_code_head(source_code^));
-      trailing := 0u
-    end;
-    source_code_advance(source_code)
-  end;
-
-  return trailing = 2u
-end;
-
-proc lexer_character(source_code: ^SourceCode, token_content: ^Char) -> Bool;
-var
-  successful: Bool;
-begin
-  successful := ~source_code_empty(source_code);
-
-  if successful then
-    if source_code_head(source_code^) = '\\' then
-      source_code_advance(source_code);
-
-      successful := ~source_code_empty(source_code) & lexer_escape(source_code_head(source_code^), token_content)
-    else
-      token_content^ := source_code_head(source_code^);
-      successful := true
-    end
-  end;
-  if successful then
-    source_code_advance(source_code)
-  end;
-  return successful
-end;
-
-proc lexer_string(source_code: ^SourceCode, token_content: ^StringBuffer) -> Bool;
-var
-  token_end, constructed_string: ^Char;
-  token_length: Word;
-  is_valid: Bool := true;
-  next_char: Char;
-begin
-  while is_valid & ~source_code_empty(source_code) & source_code_head(source_code^) <> '"' do
-    is_valid := lexer_character(source_code, @next_char);
-
-    if is_valid then
-      string_buffer_push(token_content, next_char)
-    end
-  end;
-
-  if is_valid & source_code_expect(source_code, '"') then
-    source_code_advance(source_code)
-  else
-    is_valid := false
-  end;
-  return is_valid
-end;
-
-proc lexer_number(source_code: ^SourceCode, token_content: ^Int);
-begin
-  token_content^ := 0;
-
-  while ~source_code_empty(source_code) & isdigit(cast(source_code_head(source_code^): Int)) <> 0 do
-    token_content^ := token_content^ * 10 + (cast(source_code_head(source_code^): Int) - cast('0': Int));
-
-    source_code_advance(source_code)
-  end
-end;
-
-(* Categorize an identifier. *)
-proc lexer_categorize(token_content: String) -> Token;
-var
-  current_token: Token;
-begin
-  if token_content = "if" then
-    current_token.kind := LexerKind._if
-  elsif token_content = "then" then
-    current_token.kind := LexerKind._then
-  elsif token_content = "else" then
-    current_token.kind := LexerKind._else
-  elsif token_content = "elsif" then
-    current_token.kind := LexerKind._elsif
-  elsif token_content = "while" then
-    current_token.kind := LexerKind._while
-  elsif token_content = "do" then
-    current_token.kind := LexerKind._do
-  elsif token_content = "proc" then
-    current_token.kind := LexerKind._proc
-  elsif token_content = "begin" then
-    current_token.kind := LexerKind._begin
-  elsif token_content = "end" then
-    current_token.kind := LexerKind._end
-  elsif token_content = "extern" then
-    current_token.kind := LexerKind._extern
-  elsif token_content = "const" then
-    current_token.kind := LexerKind._const
-  elsif token_content = "var" then
-    current_token.kind := LexerKind._var
-  elsif token_content = "case" then
-    current_token.kind := LexerKind._case
-  elsif token_content = "of" then
-    current_token.kind := LexerKind._of
-  elsif token_content = "type" then
-    current_token.kind := LexerKind._type
-  elsif token_content = "record" then
-    current_token.kind := LexerKind._record
-  elsif token_content = "union" then
-    current_token.kind := LexerKind._union
-  elsif token_content = "true" then
-    current_token.kind := LexerKind.boolean;
-    current_token.value.boolean_value := true
-  elsif token_content = "false" then
-    current_token.kind := LexerKind.boolean;
-    current_token.value.boolean_value := false
-  elsif token_content = "nil" then
-    current_token.kind := LexerKind.null
-  elsif token_content = "or" then
-    current_token.kind := LexerKind._or
-  elsif token_content = "return" then
-    current_token.kind := LexerKind._return
-  elsif token_content = "cast" then
-    current_token.kind := LexerKind._cast
-  elsif token_content = "defer" then
-    current_token.kind := LexerKind._defer
-  elsif token_content = "program" then
-    current_token.kind := LexerKind._program
-  elsif token_content = "module" then
-    current_token.kind := LexerKind._module
-  elsif token_content = "import" then
-    current_token.kind := LexerKind._import
-  else
-    current_token.kind := LexerKind.identifier;
-    current_token.value.string := string_dup(token_content)
-  end;
-
-  return current_token
-end;
-
-proc lexer_add_token(lexer: ^Tokenizer, token: Token);
-var
-  new_length: Word;
-begin
-  new_length := lexer^.length + 1u;
-  lexer^.data := cast(reallocarray(cast(lexer^.data: Pointer), new_length, #size(Token)): ^Token);
-  (lexer^.data + lexer^.length)^ := token;
-  lexer^.length := new_length
-end;
-
-(* Read the next token from the input. *)
-proc lexer_next(source_code: SourceCode, token_buffer: ^StringBuffer) -> Token;
-var
-  current_token: Token;
-  first_char: Char;
-begin
-  current_token.kind := LexerKind.unknown;
-
-  first_char := source_code_head(source_code);
-
-  if isalpha(cast(first_char: Int)) <> 0 or first_char = '_' then
-    lexer_identifier(@source_code, token_buffer);
-    current_token := lexer_categorize(string_buffer_clear(token_buffer))
-  elsif first_char = '#' then
-    source_code_advance(@source_code);
-    lexer_identifier(@source_code, token_buffer);
-
-    current_token.kind := LexerKind.trait;
-    current_token.value.string := string_dup(string_buffer_clear(token_buffer))
-  elsif isdigit(cast(first_char: Int)) <> 0 then
-    lexer_number(@source_code, @current_token.value.int_value);
-
-    if source_code_expect(@source_code, 'u') then
-      current_token.kind := LexerKind.word;
-        source_code_advance(@source_code)
-    else
-      current_token.kind := LexerKind.integer
-    end
-  elsif first_char = '(' then
-    source_code_advance(@source_code);
-
-    if source_code_empty(@source_code) then
-      current_token.kind := LexerKind.left_paren
-    elsif source_code_head(source_code) = '*' then
-      source_code_advance(@source_code);
-
-      if lexer_comment(@source_code, token_buffer) then
-        current_token.value.string := string_dup(string_buffer_clear(token_buffer));
-        current_token.kind := LexerKind.comment
-      else
-        current_token.kind := LexerKind.unknown
-      end
-    else
-      current_token.kind := LexerKind.left_paren
-    end
-  elsif first_char = ')' then
-    current_token.kind := LexerKind.right_paren;
-    source_code_advance(@source_code)
-  elsif first_char = '\'' then
-    source_code_advance(@source_code);
-
-    if lexer_character(@source_code, @current_token.value.char_value) & source_code_expect(@source_code, '\'') then
-      current_token.kind := LexerKind.character;
-      source_code_advance(@source_code)
-    else
-      current_token.kind := LexerKind.unknown
-    end
-  elsif first_char = '"' then
-    source_code_advance(@source_code);
-
-    if lexer_string(@source_code, token_buffer) then
-      current_token.kind := LexerKind.string;
-      current_token.value.string := string_dup(string_buffer_clear(token_buffer))
-    else
-      current_token.kind := LexerKind.unknown
-    end
-  elsif first_char = '[' then
-    current_token.kind := LexerKind.left_square;
-    source_code_advance(@source_code)
-  elsif first_char = ']' then
-    current_token.kind := LexerKind.right_square;
-    source_code_advance(@source_code)
-  elsif first_char = '>' then
-    source_code_advance(@source_code);
-
-    if source_code_empty(@source_code) then
-      current_token.kind := LexerKind.greater_than
-    elsif source_code_head(source_code) = '=' then
-      current_token.kind := LexerKind.greater_equal;
-      source_code_advance(@source_code)
-    elsif source_code_head(source_code) = '>' then
-      current_token.kind := LexerKind.shift_right;
-      source_code_advance(@source_code)
-    else
-      current_token.kind := LexerKind.greater_than
-    end
-  elsif first_char = '<' then
-    source_code_advance(@source_code);
-
-    if source_code_empty(@source_code) then
-      current_token.kind := LexerKind.less_than
-    elsif source_code_head(source_code) = '=' then
-      current_token.kind := LexerKind.less_equal;
-      source_code_advance(@source_code)
-    elsif source_code_head(source_code) = '<' then
-      current_token.kind := LexerKind.shift_left;
-      source_code_advance(@source_code)
-    elsif source_code_head(source_code) = '>' then
-      current_token.kind := LexerKind.not_equal;
-      source_code_advance(@source_code)
-    else
-      current_token.kind := LexerKind.less_than
-    end
-  elsif first_char = '=' then
-    current_token.kind := LexerKind.equal;
-    source_code_advance(@source_code)
-  elsif first_char = ';' then
-    current_token.kind := LexerKind.semicolon;
-    source_code_advance(@source_code)
-  elsif first_char = '.' then
-    current_token.kind := LexerKind.dot;
-    source_code_advance(@source_code)
-  elsif first_char = ',' then
-    current_token.kind := LexerKind.comma;
-    source_code_advance(@source_code)
-  elsif first_char = '+' then
-    current_token.kind := LexerKind.plus;
-    source_code_advance(@source_code)
-  elsif first_char = '-' then
-    source_code_advance(@source_code);
-
-    if source_code_empty(@source_code) then
-      current_token.kind := LexerKind.minus
-    elsif source_code_head(source_code) = '>' then
-      current_token.kind := LexerKind.arrow;
-      source_code_advance(@source_code)
-    else
-      current_token.kind := LexerKind.minus
-    end
-  elsif first_char = '*' then
-    current_token.kind := LexerKind.multiplication;
-    source_code_advance(@source_code)
-  elsif first_char = '/' then
-    current_token.kind := LexerKind.division;
-    source_code_advance(@source_code)
-  elsif first_char = '%' then
-    current_token.kind := LexerKind.remainder;
-    source_code_advance(@source_code)
-  elsif first_char = ':' then
-    source_code_advance(@source_code);
-
-    if source_code_empty(@source_code) then
-      current_token.kind := LexerKind.colon
-    elsif source_code_head(source_code) = '=' then
-      current_token.kind := LexerKind.assignment;
-      source_code_advance(@source_code)
-    else
-      current_token.kind := LexerKind.colon
-    end
-  elsif first_char = '^' then
-    current_token.kind := LexerKind.hat;
-    source_code_advance(@source_code)
-  elsif first_char = '@' then
-    current_token.kind := LexerKind.at;
-    source_code_advance(@source_code)
-  elsif first_char = '!' then
-    current_token.kind := LexerKind.exclamation;
-    source_code_advance(@source_code)
-  elsif first_char = '&' then
-    current_token.kind := LexerKind.and;
-    source_code_advance(@source_code)
-  elsif first_char = '~' then
-    current_token.kind := LexerKind.not;
-    source_code_advance(@source_code)
-  elsif first_char = '|' then
-    current_token.kind := LexerKind.pipe;
-    source_code_advance(@source_code)
-  else
-    current_token.kind := LexerKind.unknown;
-    source_code_advance(@source_code)
-  end;
-
-  return current_token
-end;
-
-(* Split the source text into tokens. *)
-proc lexer_text(source_code: SourceCode) -> Tokenizer;
-var
-  current_token: Token;
-  token_buffer: StringBuffer;
-  lexer: Tokenizer;
-begin
-  lexer := Tokenizer(0u, nil);
-  token_buffer := string_buffer_new();
-
-  lexer_spaces(@source_code);
-
-  while ~source_code_empty(@source_code) do
-    current_token := lexer_next(source_code, @token_buffer);
-
-    if current_token.kind <> LexerKind.unknown then
-      lexer_add_token(@lexer, current_token);
-        lexer_spaces(@source_code)
-    else
-      write_s("Lexical analysis error on \"");
-      write_c(source_code_head(source_code));
-      write_s("\".\n")
-    end
-  end;
-
-  return lexer
-end;
-
-(*
-  Parser.
-*)
-
-proc parse(tokens: ^Token, tokens_size: Word);
-var
-  current_token: ^Token;
-  i: Word := 0u;
-begin
-  while i < tokens_size do
-    current_token := tokens + i;
-
-    case current_token^.kind of
-      LexerKind._if:
-        write_s("IF")
-      | LexerKind._then:
-        write_s("THEN")
-      | LexerKind._else:
-        write_s("ELSE")
-      | LexerKind._elsif:
-        write_s("ELSIF")
-      | LexerKind._while:
-        write_s("WHILE")
-      | LexerKind._do:
-        write_s("DO")
-      | LexerKind._proc:
-        write_s("PROC")
-      | LexerKind._begin:
-        write_s("BEGIN")
-      | LexerKind._end:
-        write_s("END")
-      | LexerKind._extern:
-        write_s("EXTERN")
-      | LexerKind._const:
-        write_s("CONST")
-      | LexerKind._var:
-        write_s("VAR")
-     | LexerKind._case:
-        write_s("CASE")
-      | LexerKind._of:
-        write_s("OF")
-      | LexerKind._type:
-        write_s("TYPE")
-      | LexerKind._record:
-        write_s("RECORD")
-      | LexerKind._union:
-        write_s("UNION")
-      | LexerKind.pipe:
-        write_s("|")
-      | LexerKind.to:
-        write_s("TO")
-      | LexerKind.boolean:
-        write_s("BOOLEAN<");
-        write_b(current_token^.value.boolean_value);
-        write_c('>')
-      | LexerKind.null:
-        write_s("NIL")
-      | LexerKind.and:
-        write_s("&")
-      | LexerKind._or:
-        write_s("OR")
-      | LexerKind.not:
-        write_s("~")
-      | LexerKind._return:
-        write_s("RETURN")
-      | LexerKind._cast:
-        write_s("CAST")
-      | LexerKind.shift_left:
-        write_s("<<")
-      | LexerKind.shift_right:
-        write_s(">>")
-      | LexerKind.identifier:
-        write_c('<');
-        write_s(current_token^.value.string);
-        write_c('>')
-      | LexerKind.trait:
-        write_c('#');
-        write_s(current_token^.value.string)
-      | LexerKind.left_paren:
-        write_s("(")
-      | LexerKind.right_paren:
-        write_s(")")
-      | LexerKind.left_square:
-        write_s("[")
-      | LexerKind.right_square:
-        write_s("]")
-      | LexerKind.greater_equal:
-        write_s(">=")
-      | LexerKind.less_equal:
-        write_s("<=")
-      | LexerKind.greater_than:
-        write_s(">")
-      | LexerKind.less_than:
-        write_s("<")
-      | LexerKind.equal:
-        write_s("=")
-      | LexerKind.not_equal:
-        write_s("<>")
-      | LexerKind.semicolon:
-        write_c(';')
-      | LexerKind.dot:
-        write_c('.')
-      | LexerKind.comma:
-        write_c(',')
-      | LexerKind.plus:
-        write_c('+')
-      | LexerKind.minus:
-        write_c('-')
-      | LexerKind.multiplication:
-        write_c('*')
-      | LexerKind.division:
-        write_c('/')
-      | LexerKind.remainder:
-        write_c('%')
-      | LexerKind.assignment:
-        write_s(":=")
-      | LexerKind.colon:
-        write_c(':')
-      | LexerKind.hat:
-        write_c('^')
-      | LexerKind.at:
-        write_c('@')
-      | LexerKind.comment:
-        write_s("(* COMMENT *)")
-      | LexerKind.integer:
-        write_c('<');
-        write_i(current_token^.value.int_value);
-        write_c('>')
-      | LexerKind.word:
-        write_c('<');
-        write_i(current_token^.value.int_value);
-        write_s("u>")
-      | LexerKind.character:
-        write_c('<');
-        write_i(cast(current_token^.value.char_value: Int));
-        write_s("c>")
-      | LexerKind.string:
-        write_s("\"...\"")
-      | LexerKind._defer:
-        write_s("DEFER")
-      | LexerKind.exclamation:
-        write_c('!')
-      | LexerKind.arrow:
-        write_s("->")
-      | LexerKind._program:
-        write_s("PROGRAM")
-      | LexerKind._module:
-      write_s("MODULE")
-      | LexerKind._import:
-      write_s("IMPORT")
-      else
-        write_s("UNKNOWN<");
-        write_i(cast(current_token^.kind: Int));
-        write_c('>')
-    end;
-    write_c(' ');
-
-    i := i + 1u
-  end;
-  write_c('\n')
-end;
-
-(*
-  Compilation entry.
-*)
-
-proc compile_in_stages(command_line: ^CommandLine, source_code: SourceCode) -> Int;
-var
-  return_code: Int := 0;
-  lexer: Tokenizer;
-begin
-  if command_line^.lex or command_line^.parse then
-    lexer := lexer_text(source_code)
-  end;
-  if command_line^.parse then
-    parse(lexer.data, lexer.length)
-  end;
-
-  return return_code
-end;
-
-proc process(argc: Int, argv: ^^Char) -> Int;
-var
-  tokens: ^Token;
-  tokens_size: Word;
-  source_code: SourceCode;
-  command_line: ^CommandLine;
-  return_code: Int := 0;
-  source_file: ^SourceFile;
-begin
-  command_line := parse_command_line(argc, argv);
-  if command_line = nil then
-    return_code := 2
-  end;
-
-  if return_code = 0 then
-    source_file := read_source(command_line^.input);
-
-    if source_file = nil then
-      perror(command_line^.input);
-      return_code := 3
-    end
-  end;
-
-  if return_code = 0 then
-    defer
-      fclose(source_file^.handle)
-    end;
-
-    source_code.position := TextLocation(1u, 1u);
-    source_code.input := cast(source_file: Pointer);
-    source_code.empty := source_file_empty;
-    source_code.head := source_file_head;
-    source_code.advance := source_file_advance;
-
-    return_code := compile_in_stages(command_line, source_code)
-  end;
-  return return_code
-end;
-
-  return process(count, parameters)
-end.