1
{
  cancelable: true,
  message: "Uncaught Error: foo",
  filename: "[WILDCARD]/queue_microtask_error_handled.ts",
  lineno: 18,
  colno: 9,
  error: Error: foo
    at [WILDCARD]/queue_microtask_error_handled.ts:18:9
    at deno:core/[WILDCARD]
}
onerror() called Error: foo
    at [WILDCARD]/queue_microtask_error_handled.ts:18:9
    at deno:core/[WILDCARD]
2