Issue 25962. Check for the number of arguments vs. number of required parameters.

pkg/analysis_server/lib/src/services/correction/fix_internal.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 analysis_server.src.services.correction.fix_internal;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:core' hide Resource;
 
@@ skipping 410 matching lines @@
       SimpleIdentifier methodName = invocation.methodName;
       Element targetElement = methodName.bestElement;
       List<Expression> arguments = argumentList.arguments;
       if (targetElement is ExecutableElement) {
         List<ParameterElement> parameters = targetElement.parameters;
         int numParameters = parameters.length;
         Iterable<ParameterElement> requiredParameters = parameters
             .takeWhile((p) => p.parameterKind == ParameterKind.REQUIRED);
         Iterable<ParameterElement> optionalParameters = parameters
             .skipWhile((p) => p.parameterKind == ParameterKind.REQUIRED);
+        // prepare the argument to add a new parameter for
         int numRequired = requiredParameters.length;
+        if (numRequired >= arguments.length) {
+          return;
+        }
         Expression argument = arguments[numRequired];
         // prepare target
         int targetOffset;
         if (numRequired != 0) {
           AstNode parameterNode = requiredParameters.last.computeNode();
           targetOffset = parameterNode.end;
         } else {
           AstNode targetNode = targetElement.computeNode();
           if (targetNode is FunctionDeclaration) {
             FunctionExpression function = targetNode.functionExpression;
@@ skipping 2529 matching lines @@
 /**
  * Describes the location for a newly created [FieldDeclaration].
  */
 class _FieldLocation {
   final String prefix;
   final int offset;
   final String suffix;
 
   _FieldLocation(this.prefix, this.offset, this.suffix);
 }