Function unregister_dialect

crates/stdlib/src/csv.rs:312–329

(
        name: PyObjectRef,
        mut _rest: FuncArgs,
        vm: &VirtualMachine,
    )

    #[pyfunction]
    fn unregister_dialect(
        name: PyObjectRef,
        mut _rest: FuncArgs,
        vm: &VirtualMachine,
    ) -> PyResult<()> {
        let name = name.downcast::<PyStr>().map_err(|obj| {
            new_csv_error(
                vm,
                format!("argument 0 must be a string, not '{}'", obj.class()),
            )
        })?;
        let name: PyUtf8StrRef = name.try_into_utf8(vm)?;
        let mut g = GLOBAL_HASHMAP.lock();
        if let Some(_removed) = g.remove(name.as_str()) {
            return Ok(());
        }
        Err(new_csv_error(vm, "unknown dialect"))
    }

    #[pyfunction]
    fn list_dialects(