IpcOneShotServer leaks mach ports

[mitsuhiko]

This is a minimal example of a system resource leak:

use ipc_channel::ipc::IpcOneShotServer;

fn main() {
    loop {
        let _ = IpcOneShotServer::<()>::new().unwrap();
    }
}

[mitsuhiko]

From what I can tell the answer to this question is yes:

ipc-channel/src/platform/macos/mod.rs

Lines 262 to 264 in 82cbc21

	// FIXME(pcwalton): Does this leak?
	let (right, acquired_right) = mach_port_extract_right(port, MACH_MSG_TYPE_MAKE_SEND as u32)?;
	debug_assert!(acquired_right == MACH_MSG_TYPE_PORT_SEND as u32);

If I don't call that function I cannot observe a leak.