fix #26414, infer return types of local functions

CHANGELOG.md

 ## 1.19.0
 
 ### Core library changes
 
 * `dart:io`
   * `Socket.connect` with source-address argument is now non-blocking
     on Mac. Was already non-blocking on all other platforms.
   * Report a better error when a bind fails because of a bad source address.
 
+### Analyzer
+
+*   Strong mode breaking change - infer generic type arguments from the
+    constructor invocation arguments
+    (SDK issue [25220](https://github.com/dart-lang/sdk/issues/25220))
+
+    ```dart
+    var map = new Map<String, String>();
+
+    // infer: Map<String, String>
+    var otherMap = new Map.from(map);
+    ```
+
+*   Strong mode breaking change - infer local function return type
+    (SDK issue [26414](https://github.com/dart-lang/sdk/issues/26414))
+
+    ```dart
+    void main() {
+      // infer: return type is int
+      f() { return 40; }
+      int y = f() + 2; // type checks
+      print(y);
+    }
+    ```
+
 ### Tool Changes
 
 * `dartfmt` - upgraded to v0.2.9
   * Support trailing commas in argument and parameter lists.
   * Gracefully handle read-only files.
   * About a dozen other bug fixes.
 
 * Pub
   * Added the ability for packages to declare a constraint on the [Flutter][]
     SDK:
@@ skipping 1080 matching lines @@
     they will keep the Dart process alive until they time out. This fixes the
     handling of persistent connections. Previously, the client would shut down
     immediately after a request.
 
   * **Breaking change:** `HttpServer` no longer compresses all traffic by
     default. The new `autoCompress` property can be set to `true` to re-enable
     compression.
 
 * `dart:isolate`: `Isolate.spawnUri` added the optional `packageRoot` argument,
   which controls how it resolves `package:` URIs.