Macro assert_tokens 

macro_rules! assert_tokens {
    ($lhs:expr, { $($rhs:tt)* }) => { ... };
}

Available on crate feature parser only.

Asserts that the lhs matches the tokens wrapped in braces on the rhs.

lhs needs to be an expression implementing IntoIterator<Item=TokenTree> e.g. TokenStream or TokenParser.

let some_tokens = quote! { ident, { group } };

assert_tokens! {some_tokens, { ident, {group} }};