Typedef requires include and not forward declaration

cpp/find_warnings.py

@@ -249,7 +249,10 @@ def _add_reference(name, namespace):
                     return
                 name = file_use_node[1].normalized_filename
                 if name in file_uses:
-                    file_uses[name] |= USES_REFERENCE
+                    if isinstance(file_use_node[0], ast.Typedef):
+                        file_uses[name] |= USES_DECLARATION
+                    else:
+                        file_uses[name] |= USES_REFERENCE
 
         def _add_use(name, namespace):
             if isinstance(name, list):

test/baz.h

@@ -1,3 +1,5 @@
 #include "bar.h"
+#include "typedef.h"
 
 void fct(Bar& bar);
+void fct(Type& t);

test/typedef.h

@@ -2,3 +2,4 @@ class Foo;
 class Bar;
 typedef Plain<Foo> p;
 typedef Ref<Bar*> r;
+typedef int Type;