Fix names selection and params, fixes #1283

jedi/evaluate/syntax_tree.py

@@ -527,8 +527,6 @@ def tree_name_to_contexts(evaluator, context, tree_name):
             # which means the function itself.
             filters = [next(filters)]
             return finder.find(filters, attribute_lookup=False)
-        elif node.type == 'param':
-            raise NotImplementedError
         elif node.type not in ('import_from', 'import_name'):
             context = evaluator.create_context(context, tree_name)
             return eval_atom(context, tree_name)
@@ -571,6 +569,8 @@ def tree_name_to_contexts(evaluator, context, tree_name):
         # the static analysis report.
         exceptions = context.eval_node(tree_name.get_previous_sibling().get_previous_sibling())
         types = exceptions.execute_evaluated()
+    elif node.type == 'param':
+        types = NO_CONTEXTS
     else:
         raise ValueError("Should not happen. type: %s" % typ)
     return types