Handle local functions in kernel_impact.

pkg/compiler/lib/src/kernel/kernel_visitor.dart

Index: pkg/compiler/lib/src/kernel/kernel_visitor.dart
diff --git a/pkg/compiler/lib/src/kernel/kernel_visitor.dart b/pkg/compiler/lib/src/kernel/kernel_visitor.dart
index 26f3b3a01fba3760919e1a9c8c81d8464dfe8058..415483f4c371f9fc985d87784e52833e0b56c13a 100644
--- a/pkg/compiler/lib/src/kernel/kernel_visitor.dart
+++ b/pkg/compiler/lib/src/kernel/kernel_visitor.dart
@@ -1689,8 +1689,12 @@ class KernelVisitor extends Object
       LocalFunctionElement localFunction, NodeList parameters, Node body, _) {
     return withCurrentElement(localFunction, () {
       ir.VariableDeclaration local = getLocal(localFunction)..isFinal = true;
-      return new ir.FunctionDeclaration(
+      ir.FunctionDeclaration function = new ir.FunctionDeclaration(
           local, buildFunctionNode(localFunction, body));
+      // Closures can escape their context and we must therefore store them
+      // globally to include them in the world computation.
+      kernel.localFunctions[localFunction] = function;
+      return function;
     });
   }