diff --git a/crates/oxc_ast/src/ast/js.rs b/crates/oxc_ast/src/ast/js.rs
index 6e53b6a7d73bf..66216b6dcc5c4 100644
--- a/crates/oxc_ast/src/ast/js.rs
+++ b/crates/oxc_ast/src/ast/js.rs
@@ -53,6 +53,22 @@ pub fn traverse<'a, T: Traverse<'a>>(
     // walk_traversable_program(traverser, program, ctx, tk);
 }
 
+// TODO: Delete this - just for testing type layouts.
+// The `inherit_variants!` macro has screwed up `layout_inspect` - it can't see these inherited types.
+#[derive(layout_inspect::Inspect)]
+pub enum FakeForTestingInheritedTypes<'a> {
+    Program(Box<'a, Program<'a>>),
+    MemberExpression(Box<'a, MemberExpression<'a>>),
+    Expression(Box<'a, Expression<'a>>),
+    SimpleAssignmentTarget(Box<'a, SimpleAssignmentTarget<'a>>),
+    AssignmentTargetPattern(Box<'a, AssignmentTargetPattern<'a>>),
+    AssignmentTarget(Box<'a, AssignmentTarget<'a>>),
+    Declaration(Box<'a, Declaration<'a>>),
+    ModuleDeclaration(Box<'a, ModuleDeclaration<'a>>),
+    TSType(Box<'a, TSTypeName<'a>>),
+    TSTypeName(Box<'a, TSTypeName<'a>>),
+}
+
 #[ast_node]
 #[derive(Debug, Hash)]
 #[cfg_attr(feature = "serialize", derive(Serialize, Tsify))]
diff --git a/tasks/inspect_ast/lib/index.mjs b/tasks/inspect_ast/lib/index.mjs
index 1a3a3b4849b46..2588ced821a4a 100644
--- a/tasks/inspect_ast/lib/index.mjs
+++ b/tasks/inspect_ast/lib/index.mjs
@@ -102,6 +102,7 @@ console.log('--------------------');
 console.log('> Nested enums:');
 const nestedEnums = Object.values(types).flatMap((type) => {
     if (type.kind !== 'enum') return [];
+    if (type.name === 'FakeForTestingInheritedTypes') return [];
     return type.variants.filter(({type: variantType}) => (
         variantType?.kind === 'enum'
         || (variantType?.kind === 'box' && variantType.value.kind === 'enum')
diff --git a/tasks/inspect_ast/src/main.rs b/tasks/inspect_ast/src/main.rs
index 38b2f41e7a91b..587f397fd7b4b 100644
--- a/tasks/inspect_ast/src/main.rs
+++ b/tasks/inspect_ast/src/main.rs
@@ -2,10 +2,10 @@
 
 use layout_inspect::inspect;
 
-use oxc_ast::ast::Program;
+use oxc_ast::ast::FakeForTestingInheritedTypes;
 
 pub fn main() {
-    let types = inspect::<Program>();
+    let types = inspect::<FakeForTestingInheritedTypes>();
     let json = serde_json::to_string_pretty(&types).unwrap();
     println!("{json}");
 }