Clean up type inference methods.

pkg/front_end/lib/src/fasta/kernel/kernel_shadow_ast.dart

 // Copyright (c) 2017, 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 file.
 
 /// This file declares a "shadow hierarchy" of concrete classes which extend
 /// the kernel class hierarchy, adding methods and fields needed by the
 /// BodyBuilder.
 ///
 /// Instances of these classes may be created using the factory methods in
 /// `ast_factory.dart`.
@@ skipping 115 matching lines @@
   @override
   DartType _inferExpression(
       KernelTypeInferrer inferrer, DartType typeContext, bool typeNeeded) {
     KernelArguments arguments = this.arguments;
     return inferrer.inferConstructorInvocation(
         typeContext,
         typeNeeded,
         fileOffset,
         target,
         arguments._hasExplicitTypeArguments ? arguments.types : null,
-        _forEachArgument, (type) {
+        _forEachArgument, (types) {
       arguments.types.clear();
-      arguments.types.addAll(type.typeArguments);
+      arguments.types.addAll(types);
     });
   }
 }
 
 /// Shadow object for [DirectMethodInvocation].
 class KernelDirectMethodInvocation extends DirectMethodInvocation
     implements KernelExpression {
   KernelDirectMethodInvocation(
       Expression receiver, Procedure target, Arguments arguments)
       : super(receiver, target, arguments);
@@ skipping 774 matching lines @@
       : super(variable, value);
 
   @override
   DartType _inferExpression(
       KernelTypeInferrer inferrer, DartType typeContext, bool typeNeeded) {
     var variable = this.variable as KernelVariableDeclaration;
     return inferrer.inferVariableSet(
         typeContext, typeNeeded, variable._declaredType, value);
   }
 }