Macro holmes::func

macro_rules! func {
    ($holmes:ident, let $name:ident : $src:tt -> $dst:tt = $body:expr) => { ... };
    (let $name:ident : $src:tt -> $dst:tt = $body:expr) => { ... };
}

Registers a native rust function with the Holmes object for use in rules.

func!(holmes, let f : uint64 -> string = |x : &u64| {
  format!("{}", x)
})

If your function input has more than one parameter, they will be tupled and packed into a value. To describe such a function, just use a tuple type on the left of the arrow.