Macro rocket_guide_tests::assert_form_parses

macro_rules! assert_form_parses {
    ($T:ty, $form:expr => $value:expr) => { ... };
    ($T:ty, $($form:expr => $value:expr),+ $(,)?) => { ... };
    ($T:ty, $($form:expr),+ $(,)? => $value:expr) => { ... };
}