foo.rs

    #[test]
    fn an_if_test_that_returns_a_None_out_expr_should_run_the_conseq_branch() {
        let mut env = Env::new(
            Some(vec!(~"x")), Some(vec!(Atom(Integer(42)))),
            None);
        let in_expr = parse_str(~"(if (set! x 37) (quote conseq) (quote alt))");
        let out_expr = { 
            let env_borrow = &mut env;
            eval(in_expr, env_borrow).expect("should return an Expr")
        };
        assert_eq!(out_expr, Atom(Symbol(~"conseq")));
        assert_eq!(env.find_scope(&~"x").get(&~"x"), &Atom(Integer(37)));
    }

gistfile1.txt

src/schemers/main.rs:605:20: 605:23 error: cannot borrow `env` as immutable because it is also borrowed as mutable
src/schemers/main.rs:605         assert_eq!(env.find_scope(&~"x").get(&~"x"), &Atom(Integer(37)));
                                            ^~~
<std macros>:1:1: 14:2 note: in expansion of assert_eq!
src/schemers/main.rs:605:9: 605:74 note: expansion site
src/schemers/main.rs:601:30: 601:38 note: previous borrow of `env` occurs here; the mutable borrow prevents subsequent moves, borrows, or modification of `env` until the borrow ends
src/schemers/main.rs:601             let env_borrow = &mut env;
                                                      ^~~~~~~~
src/schemers/main.rs:606:6: 606:6 note: previous borrow ends here
src/schemers/main.rs:595     fn an_if_test_that_returns_a_None_out_expr_should_run_the_conseq_branch() {
...
src/schemers/main.rs:606     }