The parser_cache contents have changed. Therefore adapt.

jedi/api/classes.py

@@ -389,7 +389,7 @@ class BaseDefinition(object):
             return ''
 
         path = self._name.get_root_context().py__file__()
-        lines = parser_cache[path].lines
+        lines = parser_cache[self._evaluator.grammar._hashed][path].lines
 
         line_nr = self._name.start_pos[0]
         start_line_nr = line_nr - before

test/test_api/test_api.py

@@ -13,9 +13,10 @@ from parso import cache
 def test_preload_modules():
     def check_loaded(*modules):
         # +1 for None module (currently used)
-        assert len(parser_cache) == len(modules) + 1
+        grammar_cache = next(iter(parser_cache.values()))
+        assert len(grammar_cache) == len(modules) + 1
         for i in modules:
-            assert [i in k for k in parser_cache.keys() if k is not None]
+            assert [i in k for k in grammar_cache.keys() if k is not None]
 
     temp_cache, cache.parser_cache = cache.parser_cache, {}
     parser_cache = cache.parser_cache