diff --git a/sqlparser/lib/src/ast/ast.dart b/sqlparser/lib/src/ast/ast.dart
index a05fe722..ccfc2429 100644
--- a/sqlparser/lib/src/ast/ast.dart
+++ b/sqlparser/lib/src/ast/ast.dart
@@ -52,6 +52,10 @@ abstract class AstNode with HasMetaMixin {
   /// all nodes.
   Token last;
 
+  /// Whether this ast node is synthetic, meaning that it doesn't appear in the
+  /// actual source.
+  bool synthetic;
+
   /// The first index in the source that belongs to this node. Not set for all
   /// nodes.
   int get firstPosition => first.span.start.offset;
diff --git a/sqlparser/lib/src/reader/parser/crud.dart b/sqlparser/lib/src/reader/parser/crud.dart
index 5982b3eb..db599efc 100644
--- a/sqlparser/lib/src/reader/parser/crud.dart
+++ b/sqlparser/lib/src/reader/parser/crud.dart
@@ -674,7 +674,7 @@ mixin CrudParser on ParserBase {
       baseWindowName: baseWindowName,
       partitionBy: partitionBy,
       orderBy: orderBy,
-      frameSpec: spec ?? FrameSpec(),
+      frameSpec: spec ?? (FrameSpec()..synthetic = true),
     )..setSpan(leftParen, _previous);
   }
 
diff --git a/sqlparser/lib/src/reader/parser/expressions.dart b/sqlparser/lib/src/reader/parser/expressions.dart
index 51e2961d..622e2c4a 100644
--- a/sqlparser/lib/src/reader/parser/expressions.dart
+++ b/sqlparser/lib/src/reader/parser/expressions.dart
@@ -266,9 +266,8 @@ mixin ExpressionParser on ParserBase {
 
       final selectStmt = _fullSelect(); // returns null if there's no select
       if (selectStmt != null) {
-        final stmt = select(noCompound: true) as SelectStatement;
         _consume(TokenType.rightParen, 'Expected a closing bracket');
-        return SubQuery(select: stmt)..setSpan(left, _previous);
+        return SubQuery(select: selectStmt)..setSpan(left, _previous);
       } else {
         final expr = expression();
         _consume(TokenType.rightParen, 'Expected a closing bracket');
@@ -382,7 +381,8 @@ mixin ExpressionParser on ParserBase {
         _consume(TokenType.leftParen, 'Expected opening parenthesis for tuple');
     final expressions = <Expression>[];
 
-    final subQuery = _fullSelect();
+    // if desired, attempt to parse select statement
+    final subQuery = orSubQuery ? _fullSelect() : null;
     if (subQuery == null) {
       // no sub query found. read expressions that form the tuple.
       // tuples can be empty `()`, so only start parsing values when it's not
diff --git a/sqlparser/test/parser/create_table_test.dart b/sqlparser/test/parser/create_table_test.dart
index 24925567..feac6ce0 100644
--- a/sqlparser/test/parser/create_table_test.dart
+++ b/sqlparser/test/parser/create_table_test.dart
@@ -1,6 +1,5 @@
 import 'package:sqlparser/sqlparser.dart';
 import 'package:sqlparser/src/ast/ast.dart';
-import 'package:sqlparser/src/utils/ast_equality.dart';
 import 'package:test/test.dart';
 
 import '../common_data.dart';
@@ -118,11 +117,8 @@ void main() {
   });
 
   test('parses MAPPED BY constraints when in moor mode', () {
-    const stmt = 'CREATE TABLE a (b NOT NULL MAPPED BY `Mapper()` PRIMARY KEY)';
-    final parsed = SqlEngine(useMoorExtensions: true).parse(stmt).rootNode;
-
-    enforceEqual(
-      parsed,
+    testStatement(
+      'CREATE TABLE a (b NOT NULL MAPPED BY `Mapper()` PRIMARY KEY)',
       CreateTableStatement(tableName: 'a', columns: [
         ColumnDefinition(
           columnName: 'b',
@@ -134,15 +130,13 @@ void main() {
           ],
         ),
       ]),
+      moorMode: true,
     );
   });
 
   test('parses JSON KEY constraints in moor mode', () {
-    const stmt = 'CREATE TABLE a (b INTEGER JSON KEY "my_json_key")';
-    final parsed = SqlEngine(useMoorExtensions: true).parse(stmt).rootNode;
-
-    enforceEqual(
-      parsed,
+    testStatement(
+      'CREATE TABLE a (b INTEGER JSON KEY "my_json_key")',
       CreateTableStatement(
         tableName: 'a',
         columns: [
@@ -158,6 +152,7 @@ void main() {
           ),
         ],
       ),
+      moorMode: true,
     );
   });
 }
diff --git a/sqlparser/test/parser/expression_test.dart b/sqlparser/test/parser/expression_test.dart
index 59621e53..34b21906 100644
--- a/sqlparser/test/parser/expression_test.dart
+++ b/sqlparser/test/parser/expression_test.dart
@@ -146,8 +146,8 @@ void main() {
         final tokens = scanner.scanTokens();
         final parser = Parser(tokens);
         final expression = parser.expression();
-        enforceHasSpan(expression);
 
+        enforceHasSpan(expression);
         enforceEqual(expression, expected);
       });
     });
diff --git a/sqlparser/test/parser/moor_file_test.dart b/sqlparser/test/parser/moor_file_test.dart
index 5ada3236..284b1b0f 100644
--- a/sqlparser/test/parser/moor_file_test.dart
+++ b/sqlparser/test/parser/moor_file_test.dart
@@ -1,5 +1,4 @@
 import 'package:sqlparser/sqlparser.dart';
-import 'package:sqlparser/src/utils/ast_equality.dart';
 import 'package:test/test.dart';
 
 import 'utils.dart';
@@ -19,12 +18,8 @@ all: SELECT /* COUNT(*), */ * FROM tbl WHERE $predicate;
 
 void main() {
   test('parses moor files', () {
-    final parsed = SqlEngine(useMoorExtensions: true).parseMoorFile(content);
-    final file = parsed.rootNode;
-    enforceHasSpan(file);
-
-    enforceEqual(
-      file,
+    testMoorFile(
+      content,
       MoorFile([
         ImportStatement('other.dart'),
         ImportStatement('another.moor'),
diff --git a/sqlparser/test/parser/multiple_statements.dart b/sqlparser/test/parser/multiple_statements.dart
index 0842b81b..07f5d05a 100644
--- a/sqlparser/test/parser/multiple_statements.dart
+++ b/sqlparser/test/parser/multiple_statements.dart
@@ -4,38 +4,35 @@ import 'package:sqlparser/src/reader/tokenizer/scanner.dart';
 import 'package:sqlparser/src/utils/ast_equality.dart';
 import 'package:test/test.dart';
 
+import 'utils.dart';
+
 void main() {
   test('can parse multiple statements', () {
     final sql = 'a: UPDATE tbl SET a = b; b: SELECT * FROM tbl;';
-    final tokens = Scanner(sql).scanTokens();
-    final moorFile = Parser(tokens).moorFile();
 
-    final statements = moorFile.statements;
-
-    enforceEqual(
-      statements[0],
-      DeclaredStatement(
-        'a',
-        UpdateStatement(
-          table: TableReference('tbl', null),
-          set: [
-            SetComponent(
-              column: Reference(columnName: 'a'),
-              expression: Reference(columnName: 'b'),
-            ),
-          ],
+    testMoorFile(
+      sql,
+      MoorFile([
+        DeclaredStatement(
+          'a',
+          UpdateStatement(
+            table: TableReference('tbl', null),
+            set: [
+              SetComponent(
+                column: Reference(columnName: 'a'),
+                expression: Reference(columnName: 'b'),
+              ),
+            ],
+          ),
         ),
-      ),
-    );
-    enforceEqual(
-      statements[1],
-      DeclaredStatement(
-        'b',
-        SelectStatement(
-          columns: [StarResultColumn(null)],
-          from: [TableReference('tbl', null)],
+        DeclaredStatement(
+          'b',
+          SelectStatement(
+            columns: [StarResultColumn(null)],
+            from: [TableReference('tbl', null)],
+          ),
         ),
-      ),
+      ]),
     );
   });
 
diff --git a/sqlparser/test/parser/partition_test.dart b/sqlparser/test/parser/partition_test.dart
index 2042295a..1806ffea 100644
--- a/sqlparser/test/parser/partition_test.dart
+++ b/sqlparser/test/parser/partition_test.dart
@@ -63,6 +63,8 @@ void main() {
         final tokens = scanner.scanTokens();
         final parser = Parser(tokens);
         final expression = parser.expression();
+
+        enforceHasSpan(expression);
         enforceEqual(expression, expected);
       });
     });
diff --git a/sqlparser/test/parser/select/from_test.dart b/sqlparser/test/parser/select/from_test.dart
index 614792a3..a26e432c 100644
--- a/sqlparser/test/parser/select/from_test.dart
+++ b/sqlparser/test/parser/select/from_test.dart
@@ -6,6 +6,7 @@ import 'package:sqlparser/src/utils/ast_equality.dart';
 import '../utils.dart';
 
 void _enforceFrom(SelectStatement stmt, List<Queryable> expected) {
+  enforceHasSpan(stmt);
   expect(stmt.from.length, expected.length);
 
   for (var i = 0; i < stmt.from.length; i++) {
diff --git a/sqlparser/test/parser/select/group_by_test.dart b/sqlparser/test/parser/select/group_by_test.dart
index 44499ce7..d144a84b 100644
--- a/sqlparser/test/parser/select/group_by_test.dart
+++ b/sqlparser/test/parser/select/group_by_test.dart
@@ -11,6 +11,7 @@ void main() {
         .parse("SELECT * FROM test GROUP BY country HAVING country LIKE '%G%'")
         .rootNode as SelectStatement;
 
+    enforceHasSpan(stmt);
     return enforceEqual(
       stmt.groupBy,
       GroupBy(
diff --git a/sqlparser/test/parser/select/limit_test.dart b/sqlparser/test/parser/select/limit_test.dart
index 3ab80bbd..c0a463f3 100644
--- a/sqlparser/test/parser/select/limit_test.dart
+++ b/sqlparser/test/parser/select/limit_test.dart
@@ -12,6 +12,7 @@ void main() {
           .parse('SELECT * FROM test LIMIT 5 * 3')
           .rootNode as SelectStatement;
 
+      enforceHasSpan(select);
       enforceEqual(
         select.limit,
         Limit(
@@ -29,6 +30,7 @@ void main() {
           .parse('SELECT * FROM test LIMIT 10 OFFSET 2')
           .rootNode as SelectStatement;
 
+      enforceHasSpan(select);
       enforceEqual(
         select.limit,
         Limit(
@@ -46,6 +48,7 @@ void main() {
           .parse('SELECT * FROM test LIMIT 10, 2')
           .rootNode as SelectStatement;
 
+      enforceHasSpan(select);
       enforceEqual(
         select.limit,
         Limit(
diff --git a/sqlparser/test/parser/select/order_by_test.dart b/sqlparser/test/parser/select/order_by_test.dart
index cc6837ad..f5016224 100644
--- a/sqlparser/test/parser/select/order_by_test.dart
+++ b/sqlparser/test/parser/select/order_by_test.dart
@@ -11,6 +11,7 @@ void main() {
         .parse('SELECT * FROM tbl ORDER BY -a, b DESC')
         .rootNode as SelectStatement;
 
+    enforceHasSpan(parsed);
     enforceEqual(
       parsed.orderBy,
       OrderBy(
diff --git a/sqlparser/test/parser/utils.dart b/sqlparser/test/parser/utils.dart
index 932eeaab..1ebc12c7 100644
--- a/sqlparser/test/parser/utils.dart
+++ b/sqlparser/test/parser/utils.dart
@@ -18,6 +18,14 @@ IdentifierToken identifier(String content) {
   return IdentifierToken(false, fakeSpan(content));
 }
 
+void testMoorFile(String moorFile, MoorFile expected) {
+  final parsed =
+      SqlEngine(useMoorExtensions: true).parseMoorFile(moorFile).rootNode;
+
+  enforceHasSpan(parsed);
+  enforceEqual(parsed, expected);
+}
+
 void testStatement(String sql, AstNode expected, {bool moorMode = false}) {
   final parsed = SqlEngine(useMoorExtensions: moorMode).parse(sql).rootNode;
   enforceHasSpan(parsed);
@@ -38,9 +46,9 @@ void testAll(Map<String, AstNode> testCases) {
 
 /// The parser should make sure [AstNode.hasSpan] is true on relevant nodes.
 void enforceHasSpan(AstNode node) {
-  final problematic = [node]
-      .followedBy(node.allDescendants)
-      .firstWhere((node) => !node.hasSpan, orElse: () => null);
+  final problematic = [node].followedBy(node.allDescendants).firstWhere(
+      (node) => !node.hasSpan && !node.synthetic,
+      orElse: () => null);
 
   if (problematic != null) {
     throw ArgumentError('Node $problematic did not have a span');