Macro fixt::fixt

macro_rules! fixt {
    ( $name:tt ) => { ... };
    ( $name:tt, $curve:expr ) => { ... };
}

tiny convenience macro to make it easy to get the first Foo from its fixturator without using the iterator interface to save a little typing c.f. fixt!(Foo) vs. FooFixturator::new(Unpredictable).next().unwrap();