Fix assignment for class types

typon/trans/tests/usertype.py

 # coding: utf-8
-# norun
 # https://lab.nexedi.com/xavier_thompson/typon-snippets/tree/master/references
 class Person:
     name: str
@@ -13,13 +12,12 @@ class Person:
     def afficher(self):
         print("afficher", self.name, self.age)
 
-# def creer():
-#     return Person("jean", 123)
+def creer():
+    return Person("jean", 123)
 
 if __name__ == "__main__":
     y = Person
-    #x = creer()
-    x = Person("jean", 123)
+    x = creer()
     print("name", x.name)
     print("age", x.age)
     x.afficher()

typon/trans/transpiler/phases/emit_cpp/class_.py

@@ -28,6 +28,7 @@ def emit_class(name: str, node: ConcreteType) -> Iterable[str]:
     yield ">"
     yield f"struct {name}__oo : referencemodel::classtype<_Base0, {name}__oo<>> {{"
     yield f"static constexpr std::string_view name = \"{name}\";"
+    yield f"auto operator=(const {name}__oo&) const {{ return *this; }}"
 
     # inner = ClassInnerVisitor2(node.inner_scope)
     # for stmt in node.body: