literal
macro_rules! set { ($( $item:expr ),* $(,)?) => { ... }; }
Set literal with .into() for each element.
.into()
use std::collections::{HashSet,BTreeSet}; use literal::{set,SetLiteral}; let a: HashSet<String> = set!{"x", "y"}; let a: BTreeSet<String> = set!{"x", "y"};