Macro intern 

macro_rules! intern {
    ($( #[$meta:meta] )*
     $vis:vis struct $struct_name:ident {
         $($name:ident : $symbol:literal),+ $(,)?
     }) => { ... };
    ($ctx: ident => {$($name:ident : $symbol:literal),+ $(,)?}) => { ... };
}

Creates a struct that holds interned symbols.

Example

use tulisp::{TulispContext, intern};

intern!{
    #[derive(Clone)]
    pub(crate) struct Keywords {
        name: ":name",
        scale: ":scale",
        pos: ":pos",
    }
}


let ctx = &mut TulispContext::new();

let kw = Keywords::new(ctx);

assert!(kw.name.eq(&ctx.intern(":name")));
assert!(kw.scale.eq(&ctx.intern(":scale")));
assert!(kw.pos.eq(&ctx.intern(":pos")));

It can also be used to create an instance of the struct directly:

use tulisp::{TulispContext, intern};

let ctx = &mut TulispContext::new();

let kw = intern!(ctx => {
    name: ":name",
    scale: ":scale",
    pos: ":pos",
});

assert!(kw.name.eq(&ctx.intern(":name")));
assert!(kw.scale.eq(&ctx.intern(":scale")));
assert!(kw.pos.eq(&ctx.intern(":pos")));