Make __file__ return the correct value

test/test_evaluate/test_context.py

@@ -5,3 +5,14 @@ def test_module_attributes(Script):
     assert def_.column is None
     str_, = def_.infer()
     assert str_.name == 'str'
+
+
+def test_module__file__(Script, environment):
+    assert not Script('__file__').goto_definitions()
+    def_, = Script('__file__', path='example.py').goto_definitions()
+    value = def_._name._context.get_safe_value()
+    assert value.endswith('example.py')
+
+    def_, = Script('import antigravity; antigravity.__file__').goto_definitions()
+    value = def_._name._context.get_safe_value()
+    assert value.endswith('.py')