ImportC: implement bitfields for StructLiteralExpression

test/runnable/bitfields.c

@@ -8,7 +8,7 @@ struct S
 
 _Static_assert(sizeof(struct S) == 4, "in");
 
-int main()
+void test1()
 {
     struct S s;
     s.a = 3;
@@ -24,6 +24,44 @@ int main()
         printf("error %d\n", s.b);
         exit(1);
     }
+}
+
+/******************************************/
+
+struct S2
+{
+    unsigned a:2, b:4;
+};
+
+struct S2 foo()
+{
+    struct S2 s = { 7, 8 };     // test struct literal expressions
+    return s;
+}
+
+void test2()
+{
+    struct S2 s = foo();
+
+    if (s.a != 3)
+    {
+        printf("error %d\n", s.a);
+        exit(1);
+    }
+
+    if (s.b != 8)
+    {
+        printf("error %d\n", s.b);
+        exit(1);
+    }
+}
+
+/******************************************/
+
+int main()
+{
+    test1();
+    test2();
 
     return 0;
 }