Function mz_lowertest::deserialize_optional

source ·
pub fn deserialize_optional<D, I, C>(
    stream_iter: &mut I,
    type_name: &'static str,
    ctx: &mut C
) -> Result<Option<D>, String>
Expand description

If the stream_iter is not empty, deserialize the next TokenTree into a D.

See to_json for the object spec syntax.

type_name should be D in string form.

stream_iter will advance by one TokenTree no matter the result.