support generic methods in FunctionExpressionInvocation node

pkg/analyzer/lib/src/generated/ast.dart

 // Copyright (c) 2014, 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.
 
 library analyzer.src.generated.ast;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
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   ArgumentList _argumentList;
 
   /**
    * The element associated with the function being invoked based on static type
    * information, or `null` if the AST structure has not been resolved or the
    * function could not be resolved.
    */
   ExecutableElement staticElement;
 
   /**
+   * The function type of the method invocation, or `null` if the AST
+   * structure has not been resolved, or if the invoke could not be resolved.
+   *
+   * This will usually be a [FunctionType], but it can also be an
+   * [InterfaceType] with a `call` method, `dynamic`, `Function`, or a `@proxy`
+   * interface type that implements `Function`.
+   */
+  DartType staticInvokeType;
+
+  /**
    * The element associated with the function being invoked based on propagated
    * type information, or `null` if the AST structure has not been resolved or
    * the function could not be resolved.
    */
   ExecutableElement propagatedElement;
 
   /**
+   * Like [staticInvokeType], but reflects propagated type information.
+   */
+  DartType propagatedInvokeType;
+
+  /**
    * Initialize a newly created function expression invocation.
    */
   FunctionExpressionInvocation(Expression function,
       TypeArgumentList typeArguments, ArgumentList argumentList) {
     _function = _becomeParentOf(function);
     _typeArguments = _becomeParentOf(typeArguments);
     _argumentList = _becomeParentOf(argumentList);
   }
 
   /**
@@ skipping 6413 matching lines @@
   }
 
   @override
   accept(AstVisitor visitor) => visitor.visitYieldStatement(this);
 
   @override
   void visitChildren(AstVisitor visitor) {
     _safelyVisitChild(_expression, visitor);
   }
 }