fix circular ref testing

adl/tests/test32/test32a.adl

@@ -0,0 +1,9 @@
+
+module test32a
+{
+   import test32b.Y;
+
+   struct X {
+      Y field;
+   };
+};

adl/tests/test32/test32b.adl

@@ -0,0 +1,9 @@
+
+module test32b
+{
+   import test32a.X;
+
+   struct Y {
+      X field;
+   };
+};

adl/tests/testing_table.json

@@ -83,5 +83,6 @@
         "title": "protoapp",
         "lib_paths": [ "test31/lib" ]
     },
+    { "module_root": "test32", "modules": ["test32a", "test32b"], "fail": true, "title": "Circular module reference"},
     { "module_root": "demo1", "modules": ["picture" ] }
 ]

rust/compiler/src/processing/resolver.rs

@@ -82,7 +82,7 @@ impl Resolver {
 
         let module_refs = find_module_refs(&module0);
         for m in &module_refs {
-            self.add_module(m)?;
+            self.add_module_impl(in_progress, m)?;
         }
 
         let type_params = HashSet::new();