Silent failures from build_runner serve

[nshahan]

In the latest version at 71b79a6 build_runner serve will fail silently. To repro make sure you are using that version and launch a simple web server on localhost:8080. Then try to run build_runner serve on a package. It should fail because the port is in use by another process but the failure doesn't log anything to the console.

[jakemac53]

You must have an old server hanging around listening on that port, try this: fuser -k 8080/tcp.

[jakemac53]

Sorry didn't read the comment fully :). Looks like it is an issue with the isolate approach.

[jakemac53]

cc @natebosch

[nshahan]

Yeah, reverting back to 76216ea (right before the isolate change) gets back to the state where a crash stack trace is printed in the console.

[natebosch]

does it work as expected when you use dart .dart_tool/build/entrypoint/build.dart serve instead of pub run?

[nshahan]

@natebosch Yes.

[jakemac53]

See https://api.dartlang.org/stable/1.24.3/dart-isolate/Isolate/errors.html?

[natebosch]

Fixed by #860