Macro typemap

macro_rules! typemap {
    () => { ... };
    ($ty:ty = $val:expr, $($rest:tt)* ) => { ... };
    ($ty:ty = $val:expr) => { ... };
    (..$final:expr) => { ... };
}

Helper for creating a value of a typemap.

Takes a comma separated list of expressions of the form Type = expr, optionally followed by a single expr representing the rest of the list in the form ..rest. Expressions have core::convert::Into::into called on them implicitly

For instance,

let example = typemap!(u16 = 2u16, u8 = 1u8);
let _ = typemap!(u64 = 4u64, u32 = 3u32, ..&example);

is equivilant to:

let example = Ty::<u16, _>::new(2u16.into(), Ty::<u8, _>::new(1u8.into(), TyEnd));
let _ = Ty::<u64, _>::new(4u64.into(), Ty::<u32, _>::new(3u32, &example));