Make sure code_lines works on stubs, even if they are builtins

jedi/api/classes.py

@@ -384,10 +384,13 @@ class BaseDefinition(object):
         :return str: Returns the line(s) of code or an empty string if it's a
                      builtin.
         """
-        if not self._name.is_value_name or self.in_builtin_module():
+        if not self._name.is_value_name:
             return ''
 
         lines = self._name.get_root_context().code_lines
+        if lines is None:
+            # Probably a builtin module, just ignore in that case.
+            return ''
 
         index = self._name.start_pos[0] - 1
         start_index = max(index - before, 0)

jedi/inference/context.py

@@ -380,6 +380,8 @@ class CompiledContext(ValueContext):
 
 
 class CompiledModuleContext(CompiledContext):
+    code_lines = None
+
     def get_value(self):
         return self._value
 

test/conftest.py

@@ -129,3 +129,9 @@ def inference_state(Script):
 @pytest.fixture
 def same_process_inference_state(Script):
     return Script('', environment=InterpreterEnvironment())._inference_state
+
+
+@pytest.fixture
+def disable_typeshed(monkeypatch):
+    from jedi.inference.gradual import typeshed
+    monkeypatch.setattr(typeshed, '_load_from_typeshed', lambda *args, **kwargs: None)

test/test_api/test_api.py

@@ -170,7 +170,7 @@ def test_get_line_code(Script):
         return Script(source, line=line).completions()[0].get_line_code(**kwargs)
 
     # On builtin
-    assert get_line_code('') == ''
+    assert get_line_code('abs') == 'def abs(__n: SupportsAbs[_T]) -> _T: ...\n'
 
     # On custom code
     first_line = 'def foo():\n'
@@ -188,6 +188,13 @@ def test_get_line_code(Script):
     assert get_line_code(code, line=2, after=3, before=3) == code
 
 
+def test_get_line_code_on_builtin(Script, disable_typeshed):
+    abs_ = Script('abs').completions()[0]
+    assert abs_.name == 'abs'
+    assert abs_.get_line_code() == ''
+    assert abs_.line is None
+
+
 def test_goto_assignments_follow_imports(Script):
     code = dedent("""
     import inspect