with_builtin_macros 0.1.0

Helper for macro_rules authors to chain their macros with builtin ones (such as `env!`, `include!`, or `concat_idents!`).
Documentation 
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use ::with_builtin_macros::with_builtin;
use ::with_builtin_macros::with_eager_expansions;

macro_rules! count_tts {(
    $($tt:tt)*
) => (
    {
        0 $(+ { let _ = stringify!($tt); 1 })*
    }
)}

with_builtin!(let $fname = concat_idents!(ma, in) in {
    fn $fname ()
    {
        with_builtin! {
            let $code = include_from_root!(concat!(
                env!("CARGO_MANIFEST_DIR"), "/",
                stringify!(examples),
                "/main.rs",
            )) in {
                assert_eq!(
                    count_tts!($code),
                    14,
                );
            }
        }
    }
});

macro_rules! foo {(
    $($Variant:ident),* $(,)?
) => (
    with_eager_expansions! {
        enum Foo {
            $(
                #[doc = #{stringify!($Variant)}]
                $Variant,
            )*
        }
    }
)}

foo! {
    Foo, Bar, Baz
}