The constructor was wrapping the onData handler to hide the type-mismatch. This
copies the same logic to the onData handler.
In non-nnbd code this code was not exercised. The migration of dart:async
made this code reachable on our tests. That's because Stream.first used to
do:
var subscription;
this.listen(() => ... cancel subscription here, ...)
it now avoids making subscription nullable by registering the onData handler
later:
var subscrition = stream.listen(null, ...);
subscription.onData(() => ... cancel subscription here);
This change fixes the following 6 html tests under nnbd:
html/history_test/history/history
html/transferables_test
html/transition_event_test
html/websocket_test
html/worker_test/functional/functional
html/xhr_test
Change-Id: I095ea8d545e65b047504af0367586884bba84d72
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/134120
Commit-Queue: Sigmund Cherem <sigmund@google.com>
Reviewed-by: Srujan Gaddam <srujzs@google.com>
Sigmund Cherem
07675de0c0