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When file descriptors like sockets or the TUN device are opened in non-blocking mode, performing operations that would block emit the `WouldBlock` IO error. These errors _should_ be translated into `Poll::Pending` and have a waker registered that gets called whenever the operation should be attempted again. Therefore, we should _never_ see these IO errors. Previously, the implementation of the tunnel's event-loop did not yet properly handle this backpressure and instead sometimes dropped packets when it should have suspended. This has since been fixed but the then introduced branch of just ignored the `io::ErrorKind::WouldBlock` errors had remained. Changing this to a debug-assert will alert us whenever we accidentally break this without altering the behaviour of the release binary.
Connlib
Firezone's connectivity library shared by all clients.
Building Connlib
You shouldn't need to build connlib directly; it's typically built as a dependency of one of the other Firezone components. See READMEs in those directories for relevant instructions.