Fixed analysis error. (#10035)

af4905ff · P.Y. Laligand · Andrew Wilson · 5bce52d6 · af4905ff
Commit af4905ff authored May 12, 2017 by P.Y. Laligand Committed by Andrew Wilson May 12, 2017
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expansion_tile.dart packages/flutter/lib/src/material/expansion_tile.dart +1 -1

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--- a/packages/flutter/lib/src/material/expansion_tile.dart
+++ b/packages/flutter/lib/src/material/expansion_tile.dart
@@ -112,7 +112,7 @@ class _ExpansionTileState extends State<ExpansionTile> with SingleTickerProvider
      if (_isExpanded)
        _controller.forward();
      else
-        _controller.reverse().then((Null value) {
+        _controller.reverse().then<Null>((Null value) {
          setState(() {
            // Rebuild without widget.children.
          });