Macro frunk::hlist_pat

macro_rules! hlist_pat {
    {  } => { ... };
    { $ head : pat , $ ( $ tail : tt ) , +
} => { ... };
    { $ head : pat } => { ... };
    { $ head : pat , $ ( $ tail : tt , ) + } => { ... };
    { $ head : pat , } => { ... };
}

Macro for pattern-matching on HLists.

Taken from https://github.com/tbu-/rust-rfcs/blob/master/text/0873-type-macros.md

Examples

let h = hlist![13.5f32, "hello", Some(41)];
let hlist_pat![h1, h2, h3] = h;
assert_eq!(h1, 13.5f32);
assert_eq!(h2, "hello");
assert_eq!(h3, Some(41));