fix #25944, improve Future.then inference

sdk/lib/async/future.dart

Index: sdk/lib/async/future.dart
diff --git a/sdk/lib/async/future.dart b/sdk/lib/async/future.dart
index e0e06174f4043ade4d72fc30ba945fc492e9f30a..b4d9c243393cb33fd47e1be15d4f25e71c8961fe 100644
--- a/sdk/lib/async/future.dart
+++ b/sdk/lib/async/future.dart
@@ -433,7 +433,7 @@ abstract class Future<T> {
    * with a `test` parameter, instead of handling both value and error in a
    * single [then] call.
    */
-  Future/*<S>*/ then/*<S>*/(/*=S*/ onValue(T value), { Function onError });
+  Future/*<S>*/ then/*<S>*/(onValue(T value), { Function onError });

[Leaf, 2016/08/05 22:32:36]

Presumably theres are corresponding patch to be coordinated in the main repo at
some point?

[Jennifer Messerly, 2016/08/08 21:59:26]

This is the main repo so it changes it here, but yeah, we'll need to merge it
into DDC's SDK & coordinate an upgrade of DDC's Analyzer dependency and make
sure DDC's DEPS gets rolled in main repo.

 
   /**
    * Handles errors emitted by this [Future].