- Empty struct after @if processing was not detected, causing a crash instead of an error.

- Comparing an uint and int[<4>] was incorrectly assumed to be uint compared to int, causing a crash instead of an error.
- When an `int[*][6]` was given too few values, the compiler would assert instead of giving an error.

test/test_suite/struct/empty_struct_if.c3

@@ -0,0 +1,16 @@
+import std;
+const bool FOO = false;
+struct Foo
+{
+    struct
+    {
+        struct // #error: members exist for this struct after processing
+        {
+            char d_pad0 @if(FOO);
+        }
+    }
+}
+fn void main()
+{
+	Foo f;
+}