diff --git a/src/main/java/org/jcnc/snow/compiler/ir/builder/StatementBuilder.java b/src/main/java/org/jcnc/snow/compiler/ir/builder/StatementBuilder.java
index 29cc767..b257fd2 100644
--- a/src/main/java/org/jcnc/snow/compiler/ir/builder/StatementBuilder.java
+++ b/src/main/java/org/jcnc/snow/compiler/ir/builder/StatementBuilder.java
@@ -19,18 +19,22 @@ public class StatementBuilder {
         this.exprBuilder = new ExpressionBuilder(ctx);
     }
 
-    /** 入口：根据不同语句类型分发 */
+    /**
+     * 入口：根据不同语句类型分发
+     */
     public void build(StatementNode stmt) {
-        if (stmt instanceof ExpressionStatementNode es) {
-            exprBuilder.build(es.expression());
+        if (stmt instanceof ExpressionStatementNode(org.jcnc.snow.compiler.parser.ast.base.ExpressionNode expression)) {
+            exprBuilder.build(expression);
             return;
         }
-        if (stmt instanceof AssignmentNode an) {
-            IRVirtualRegister vr = exprBuilder.build(an.value());
-            if (ctx.getScope().lookup(an.variable()) == null) {
-                ctx.getScope().declare(an.variable(), vr);
+        if (stmt instanceof AssignmentNode(
+                String variable, org.jcnc.snow.compiler.parser.ast.base.ExpressionNode value
+        )) {
+            IRVirtualRegister vr = exprBuilder.build(value);
+            if (ctx.getScope().lookup(variable) == null) {
+                ctx.getScope().declare(variable, vr);
             } else {
-                ctx.getScope().put(an.variable(), vr);
+                ctx.getScope().put(variable, vr);
             }
             return;
         }