Make it possible to infer Callable TypeVars, fixes #1449

jedi/inference/gradual/base.py

@@ -297,6 +297,9 @@ class BaseTypingValue(LazyValueWrapper):
     def _get_wrapped_value(self):
         return _PseudoTreeNameClass(self.parent_context, self._tree_name)
 
+    def __repr__(self):
+        return '%s(%s)' % (self.__class__.__name__, self._tree_name.value)
+
 
 class BaseTypingValueWithGenerics(DefineGenericBase):
     def __init__(self, parent_context, tree_name, generics_manager):
@@ -307,3 +310,7 @@ class BaseTypingValueWithGenerics(DefineGenericBase):
 
     def _get_wrapped_value(self):
         return _PseudoTreeNameClass(self.parent_context, self._tree_name)
+
+    def __repr__(self):
+        return '%s(%s%s)' % (self.__class__.__name__, self._tree_name.value,
+                             self._generics_manager)