Macro view_type 

macro_rules! view_type {
    ($($arg:tt)*) => { ... };
}

🔬This is a nightly-only experimental API. (view_type_macro #155938)

Creates a view type.

#![feature(view_types, view_type_macro)]
struct Foo {
    bar: usize,
    baz: u32,
}

type FooBar = std::view::view_type!(Foo.{ bar });