tests/test_expr.rs

extern crate proc_macro2;
extern crate syn;

use std::str::FromStr;

use proc_macro2::TokenStream;
use syn::{Expr, parse2};

#[test]
fn test_expr_parse() {
    let code = "..100u32";
    let tt = TokenStream::from_str(code).unwrap();
    let ast1: Expr = parse2(tt.clone()).unwrap();
    let ast2: syn::ExprRange = parse2(tt).unwrap();
    assert_eq!(ast1, Expr::Range(ast2));
}