'Illegal call' after alDeleteSources

[lynks--]

The following example panics during dropping the al resources;

extern crate openal;

struct ALContainer<'a, 'b> {
    pub listener: openal::Listener<'a>,
    pub streams: Vec<openal::source::Stream<'b>>,
}
fn main() {
    let listener = openal::listener::default(
        &openal::listener::Attributes::default()
    ).unwrap();

    let mut streams = Vec::new();
    for _ in 0..4 {
        streams.push(listener.source().unwrap().stream());
    }

    let container = ALContainer {
        listener: listener,
        streams: streams,
    };
}

Specifically;
thread '<main>' panicked at 'Illegal call.', src/source/source.rs:373

Which is the call to alDeleteSources(1, &self.id);

If we do not add the listener and streams to the ALContainer struct, the panic is avoided, so I guess it's something to do with the order in which things are being dropped as they go out of scope.