Macro impl_meta_tuple

macro_rules! impl_meta_tuple {
    ($ty: ident) => { ... };
    ($ty: ident [$($a: tt)*]) => { ... };
    ([$($a: tt)*]$ty: ident [$($b: tt)*]) => { ... };
}

Implement MetaTuple for a type and by proxy IntoMetaTuple, making it equivalent to MetaItem<T>.

This is useful to satisfy API constraints.

Syntax

This is equivalent to a derive macro.

// Equivalent to impl MetaTuple for MyType {}
impl_meta_tuple!(MyType)

// Equivalent to impl<T: Copy> MetaTuple for MyType <T> {}
impl_meta_tuple!([T: Copy]MyType[T])