diff --git a/crates/oxide_fold/src/propagate.rs b/crates/oxide_fold/src/propagate.rs
index 9f435727..b48a6e12 100644
--- a/crates/oxide_fold/src/propagate.rs
+++ b/crates/oxide_fold/src/propagate.rs
@@ -86,15 +86,13 @@ pub fn fold_function(f: &mut IRFunction) -> bool {
             // VOID 无操作数，恒折 Undefined。
             OpCode::VOID => Some(Constant::Undefined),
             // 其余一元：操作数须为已知寄存器。
-            OpCode::NOT | OpCode::TYPEOF | OpCode::NEG | OpCode::UNARY_PLUS | OpCode::BIT_NOT => {
-                match inst.a {
-                    Operand::Reg(x) => known
-                        .get(x as usize)
-                        .and_then(|c| c.as_ref())
-                        .and_then(|c| fold_table::fold_unary(inst.op, c)),
-                    _ => None,
-                }
-            }
+            OpCode::NOT | OpCode::TYPEOF | OpCode::NEG | OpCode::UNARY_PLUS | OpCode::BIT_NOT => match inst.a {
+                Operand::Reg(x) => known
+                    .get(x as usize)
+                    .and_then(|c| c.as_ref())
+                    .and_then(|c| fold_table::fold_unary(inst.op, c)),
+                _ => None,
+            },
             // 二元算术：两操作数须为已知寄存器。
             OpCode::ADD | OpCode::SUB | OpCode::MUL | OpCode::DIV | OpCode::MOD | OpCode::EXP => {
                 match (inst.a, inst.b) {
diff --git a/crates/oxide_fold/tests/fold_tests.rs b/crates/oxide_fold/tests/fold_tests.rs
index 7ee45fb1..24587dbf 100644
--- a/crates/oxide_fold/tests/fold_tests.rs
+++ b/crates/oxide_fold/tests/fold_tests.rs
@@ -328,10 +328,7 @@ fn fold_add_bigint() {
 #[test]
 fn fold_add_bigint_mixed_not_folded() {
     // 1n + 1 BigInt 混合 → 不折（运行期抛 TypeError）。
-    let (a, b) = (
-        Constant::BigInt(num_bigint::BigInt::from(1)),
-        Constant::Int(1),
-    );
+    let (a, b) = (Constant::BigInt(num_bigint::BigInt::from(1)), Constant::Int(1));
     let mut f = func(
         &[a, b],
         vec![