Fix issue in record toString method generator

classlib/src/main/java/org/teavm/classlib/impl/record/ObjectMethodsSubstitutor.java

@@ -171,6 +171,9 @@ public class ObjectMethodsSubstitutor implements BootstrapMethodSubstitutor {
             String fieldTitle = (index == 0 ? "" : ", ") + fieldName + "=";
             resultVar = resultVar.invokeVirtual("append", StringBuilder.class, pe.constant(fieldTitle));
             ValueEmitter thisField = InvokeDynamicUtil.invoke(pe, getter, thisVar);
+            if (!(getter.getValueType() instanceof ValueType.Primitive)) {
+                thisField = thisField.cast(Object.class);
+            }
             resultVar = resultVar.invokeVirtual("append", StringBuilder.class, thisField);
 
             index = next + 1;

tests/src/test/java/org/teavm/vm/RecordTest.java

@@ -38,7 +38,7 @@ public class RecordTest {
 
     @Test
     public void toStringMethod() {
-        String s = new A(2, "q").toString();
+        String s = new B(2, "q", 3L).toString();
 
         int index = 0;
 
@@ -56,8 +56,19 @@ public class RecordTest {
 
         index = s.indexOf("q", index);
         assertTrue(index > 0);
+        ++index;
+
+        index = s.indexOf("z", index);
+        assertTrue(index > 0);
+        ++index;
+
+        index = s.indexOf("3", index);
+        assertTrue(index > 0);
     }
 
     record A(int x, String y) {
     }
+
+    record B(int x, String y, Long z) {
+    }
 }