gistfile1.txt

fn main(args: [str]) {
    let thing = "{{ f }}";
    let f = str::find_str(thing, "{{");

    if f.is_none() {
        io::println("None!");
    }
}

/*
error:
test.rs:7:7: 7:16 error: attempted access of field is_none on type core::option::option<uint>, but no public field or method with that name was found
test.rs:7     if f.is_none() {
                 ^~~~~~~~~
test.rs:7:7: 7:18 error: mismatched types: expected function or native function but found <T5>
test.rs:7     if f.is_none() {
                 ^~~~~~~~~~~
*/