Fix for conditional expressions

lib/src/checker/resolver.dart

Index: lib/src/checker/resolver.dart
diff --git a/lib/src/checker/resolver.dart b/lib/src/checker/resolver.dart
index c31a1d72abf741d2bae2f38824996938a2de116d..0c3956a5e2b82006b0ec6469351911d1523bc2ae 100644
--- a/lib/src/checker/resolver.dart
+++ b/lib/src/checker/resolver.dart
@@ -396,6 +396,24 @@ class RestrictedStaticTypeAnalyzer extends StaticTypeAnalyzer {
     }
   }
 
+  @override
+  visitConditionalExpression(ConditionalExpression node) {
+    // TODO(vsm): This seems to be a bug in the analyzer.  The static type of
+    // a conditional should be the LUB of the then and else expressions.
+    // The analyzer appears to compute dynamic when one or the other is the
+    // null literal.

[vsm, 2015/03/16 13:20:54]

I think the better fix would be in getLeastUpperBound in element.dart.

[vsm, 2015/03/16 13:44:58]

Bug filed at: https://code.google.com/p/dart/issues/detail?id=22854

+    super.visitConditionalExpression(node);
+    if (node.staticType.isDynamic) {
+      var thenExpr = node.thenExpression;
+      var elseExpr = node.elseExpression;
+      if (thenExpr.staticType.isBottom) {
+        node.staticType = elseExpr.staticType;
+      } else if (elseExpr.staticType.isBottom) {
+        node.staticType = thenExpr.staticType;
+      }
+    }
+  }
+
   // Review note: no longer need to override visitFunctionExpression, this is
   // handled by the analyzer internally.
   // TODO(vsm): in visitbinaryExpression: check computeStaticReturnType result?