unhandled rejection at: Promise {
  <rejected> Error: bar not available
    at new Foo (file:///[WILDCARD]/testdata/unhandled_rejection.js:7:29)
    at file:///[WILDCARD]/testdata/unhandled_rejection.js:10:1
} reason: Error: bar not available
    at new Foo (file:///[WILDCARD]/testdata/unhandled_rejection.js:7:29)
    at file:///[WILDCARD]/testdata/unhandled_rejection.js:10:1
unhandled rejection at: Promise { <rejected> undefined } reason: undefined