Method fmt

libs/error-stack/src/sink.rs:406–410

(&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(")?;
            core::fmt::Display::fmt(&self.0, fmt)?;
            fmt.write_str(")")
        }
    }

    impl core::error::Error for TestError {}