Merge "aconfig: call Vec::retain instead of Vec::retain_mut" into main

        }

        let mut parsed_flags = crate::test::parse_test_flags();

        parsed_flags.parsed_flag.retain_mut(|pf| !pf.is_exported());

        parsed_flags.parsed_flag.retain(|pf| !pf.is_exported());

        let error =

            modify_parsed_flags_based_on_mode(parsed_flags, CodegenMode::Exported).unwrap_err();

        assert_eq!("exported library contains no exported flags", format!("{:?}", error));