Handle local functions in kernel_impact.

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

 // Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE.md file.
 
 import 'package:kernel/ast.dart' as ir;
 import 'package:kernel/frontend/accessors.dart'
     show
         Accessor,
         IndexAccessor,
         NullAwarePropertyAccessor,
@@ skipping 1671 matching lines @@
     // TODO(ahe): Use [constant]?
     return buildLocalVariableDeclaration(variable, variable.initializer)
       ..isConst = true;
   }
 
   @override
   ir.FunctionDeclaration visitLocalFunctionDeclaration(FunctionExpression node,
       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;
     });
   }
 
   @override
   ir.VariableDeclaration visitLocalVariableDeclaration(VariableDefinitions node,
       Node definition, LocalVariableElement variable, Node initializer, _) {
     return buildLocalVariableDeclaration(variable, initializer);
   }
 
   ir.VariableGet buildLocalGet(LocalElement local) {
@@ skipping 1048 matching lines @@
       : this(null, true, node, initializers);
 
   accept(ir.Visitor v) => throw "unsupported";
 
   visitChildren(ir.Visitor v) => throw "unsupported";
 
   String toString() {
     return "IrFunction($kind, $isConstructor, $node, $initializers)";
   }
 }