Hi, recently I started developing bitcoinfuzz - differential fuzzing of Bitcoin implementations and libraries. One of the targets gets a string and checks whether it's a valid miniscript. The code I'm using to check it with rust-miniscript is:

#[no_mangle]
pub extern "C" fn rust_miniscript_from_str(input: *const c_char) -> bool {
    if let Ok(data) = unsafe { CStr::from_ptr(input) }.to_str() {
        if let Ok(_pol) = Miniscript::<String, Segwitv0>::from_str_insane(data) {
            return true
        } else if let Ok(_pol) = Miniscript::<String, Tap>::from_str_insane(data) {
            return true
        }
    }
    false
}

and bitcoinfuzz is crashing (rust-miniscript returning invalid) with the following miniscripts (and other ones):

nnnnnnnnnnnnnnnln:1
dv:0
lll:0
l:1

Could I be missing something in my code or is it a bug?