Avoid caching parso objects, fixes #1723

test/test_parso_integration/test_parser_utils.py

@@ -1,5 +1,9 @@
+import gc
+from pathlib import Path
+
 from jedi import parser_utils
 from parso import parse
+from parso.cache import parser_cache
 from parso.python import tree
 
 import pytest
@@ -67,3 +71,21 @@ def test_get_signature(code, signature):
     if node.type == 'simple_stmt':
         node = node.children[0]
     assert parser_utils.get_signature(node) == signature
+
+
+def test_parser_cache_clear(Script):
+    """
+    If parso clears its cache, Jedi should not keep those resources, they
+    should be freed.
+    """
+    script = Script("a = abs\na", path=Path(__file__).parent / 'parser_cache_test_foo.py')
+    script.complete()
+    module_id = id(script._module_node)
+    del parser_cache[script._inference_state.grammar._hashed][script.path]
+    del script
+
+    import jedi
+    jedi.parser_utils.get_cached_parent_scope.__closure__[0].cell_contents.clear()
+
+    gc.collect()
+    assert module_id not in [id(m) for m in gc.get_referrers(tree.Module)]