Method fmt

libs/error-stack/src/ext/tuple.rs:137–139

(&self, fmt: &mut core::fmt::Formatter<'_>)

    impl Display for TestError {
        fn fmt(&self, fmt: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
            fmt.write_str("TestError")
        }
    }

    impl Error for TestError {}