diff --git a/crates/oxide_emit/src/emit.rs b/crates/oxide_emit/src/emit.rs
index 8952973..a4c5432 100644
--- a/crates/oxide_emit/src/emit.rs
+++ b/crates/oxide_emit/src/emit.rs
@@ -13,6 +13,18 @@ use oxide_ir::inst::Inst;
 use oxide_ir::operand::{LabelId, Operand};
 use oxide_ir::IRFunction;
 
+/// 是否为匿名函数定义（剥括号）：函数/箭头/class 表达式。
+pub fn is_anonymous_function_definition(expr: &oxide_parser::Expression) -> bool {
+    match expr {
+        oxide_parser::Expression::ArrowFunctionExpression(_)
+        | oxide_parser::Expression::FunctionExpression(_)
+        | oxide_parser::Expression::ClassExpression(_) => true,
+        oxide_parser::Expression::ParenthesizedExpression(p) => is_anonymous_function_definition(&p.expression),
+        _ => false,
+    }
+}
+
+
 use crate::emit_ctx::{LabelCtx, ScopeCtx};
 use crate::symbol_table::{Binding, ScopeKind, SymbolTable};
 
diff --git a/crates/oxide_emit/src/expr/assignment.rs b/crates/oxide_emit/src/expr/assignment.rs
index 4435f16..424cf87 100644
--- a/crates/oxide_emit/src/expr/assignment.rs
+++ b/crates/oxide_emit/src/expr/assignment.rs
@@ -194,12 +194,7 @@ impl Emitter {
                 let val_reg = self.emit_expression(&assign.right, ctx)?;
                 let name = id_ref.name.as_str();
                 // 赋值函数/箭头/class 表达式 → 推断 name。
-                if matches!(
-                    &assign.right,
-                    oxide_parser::Expression::ArrowFunctionExpression(_)
-                        | oxide_parser::Expression::FunctionExpression(_)
-                        | oxide_parser::Expression::ClassExpression(_)
-                ) {
+                if crate::is_anonymous_function_definition(&assign.right) {
                     if let Some(sub_mod) = ctx.nested.last_mut() {
                         if sub_mod.function_name.is_none() {
                             sub_mod.function_name = Some(name.to_string());
diff --git a/crates/oxide_emit/src/expr/object/object_literal.rs b/crates/oxide_emit/src/expr/object/object_literal.rs
index 677162a..16f691a 100644
--- a/crates/oxide_emit/src/expr/object/object_literal.rs
+++ b/crates/oxide_emit/src/expr/object/object_literal.rs
@@ -5,7 +5,7 @@ use oxide_bytecode::module::Constant;
 use oxide_bytecode::opcode::OpCode;
 use oxide_ir::inst::Inst;
 use oxide_ir::operand::Operand;
-use oxide_parser::{Expression, ObjectPropertyKind, PropertyKind};
+use oxide_parser::{ObjectPropertyKind, PropertyKind};
 
 impl Emitter {
     pub(crate) fn emit_object_expression(
@@ -56,12 +56,7 @@ impl Emitter {
                         reg
                     };
                     let val_reg = self.emit_expression(&p.value, ctx)?;
-                    if matches!(
-                        &p.value,
-                        Expression::ArrowFunctionExpression(_)
-                            | Expression::FunctionExpression(_)
-                            | Expression::ClassExpression(_)
-                    ) {
+                    if crate::is_anonymous_function_definition(&p.value) {
                         if let Some(sub_mod) = ctx.nested.last_mut() {
                             sub_mod.function_name = Some(prop_name.to_string());
                         }
@@ -84,3 +79,4 @@ impl Emitter {
         Ok(obj_reg)
     }
 }
+
diff --git a/crates/oxide_emit/src/lib.rs b/crates/oxide_emit/src/lib.rs
index 5006c24..7ca5fb2 100644
--- a/crates/oxide_emit/src/lib.rs
+++ b/crates/oxide_emit/src/lib.rs
@@ -15,7 +15,7 @@ pub mod shared;
 pub mod stmt;
 pub mod symbol_table;
 
-pub use emit::{is_int_literal, is_side_effect_free};
+pub use emit::{is_anonymous_function_definition, is_int_literal, is_side_effect_free};
 pub use emit::{CompileCtx, Emitter, FunctionBodyContext, LabelScope, ParamSpec};
 pub use oxide_bytecode::module::Constant;
 pub use oxide_parser::{AssignmentOperator, BinaryOperator, UnaryOperator};
diff --git a/crates/oxide_emit/src/shared/binding.rs b/crates/oxide_emit/src/shared/binding.rs
index 2c62cc9..45d967e 100644
--- a/crates/oxide_emit/src/shared/binding.rs
+++ b/crates/oxide_emit/src/shared/binding.rs
@@ -30,12 +30,7 @@ impl Emitter {
         let default_reg = self.emit_expression(default_expr, ctx)?;
         // 默认值表达式是匿名函数/箭头/class 时按绑定名推断 name（SetFunctionName）。
         if let Some(name) = name {
-            if matches!(
-                default_expr,
-                Expression::ArrowFunctionExpression(_)
-                    | Expression::FunctionExpression(_)
-                    | Expression::ClassExpression(_)
-            ) {
+            if crate::is_anonymous_function_definition(default_expr) {
                 if let Some(sub_mod) = ctx.nested.last_mut() {
                     if sub_mod.function_name.is_none() {
                         sub_mod.function_name = Some(name.to_string());
diff --git a/crates/oxide_emit/src/stmt/declaration/var.rs b/crates/oxide_emit/src/stmt/declaration/var.rs
index 272b22a..94427c0 100644
--- a/crates/oxide_emit/src/stmt/declaration/var.rs
+++ b/crates/oxide_emit/src/stmt/declaration/var.rs
@@ -5,7 +5,7 @@ use oxide_bytecode::module::Constant;
 use oxide_bytecode::opcode::OpCode;
 use oxide_ir::inst::Inst;
 use oxide_ir::operand::Operand;
-use oxide_parser::{BindingPattern, Expression, Statement, VariableDeclarationKind};
+use oxide_parser::{BindingPattern, Statement, VariableDeclarationKind};
 
 impl Emitter {
     pub(crate) fn emit_variable_declaration_statement(
@@ -24,12 +24,7 @@ impl Emitter {
                 let val_reg = self.emit_expression(init, ctx)?;
                 self.emit_binding_pattern(&d.id, val_reg, decl.kind, is_const, ctx)?;
                 if let BindingPattern::BindingIdentifier(bi) = &d.id {
-                    if matches!(
-                        *init,
-                        Expression::ArrowFunctionExpression(_)
-                            | Expression::FunctionExpression(_)
-                            | Expression::ClassExpression(_)
-                    ) {
+                    if crate::is_anonymous_function_definition(init) {
                         if let Some(sub_mod) = ctx.nested.last_mut() {
                             if sub_mod.function_name.is_none() {
                                 sub_mod.function_name = Some(bi.name.to_string());
@@ -72,3 +67,4 @@ impl Emitter {
         Ok(r)
     }
 }
+