Get rid of 'close' on process. It is very easy to use incorrectly and cut off data from your stream…

tests/standalone/io/process_stdout_test.dart

 // Copyright (c) 2012, 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.
 //
 // Process test program to test process communication.
 //
 // VMOptions=
 // VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
 // VMOptions=--short_socket_read --short_socket_write
 
 #import("dart:io");
 #import("dart:math");
 
 #source("process_test_util.dart");
 
 void test(Future<Process> future, int expectedExitCode) {
   future.then((process) {
     process.onExit = (exitCode) {
       Expect.equals(expectedExitCode, exitCode);
     };
 
     List<int> data = "ABCDEFGHI\n".charCodes;
     final int dataSize = data.length;
 
-    InputStream input = process.stdout;
-    OutputStream output = process.stdin;
+    InputStream out = process.stdout;
 
     int received = 0;
     List<int> buffer = [];
 
     void readData() {
-      buffer.addAll(input.read());
+      buffer.addAll(out.read());
       for (int i = received;
            i < min(data.length, buffer.length) - 1;
            i++) {
         Expect.equals(data[i], buffer[i]);
       }
       received = buffer.length;
       if (received >= dataSize) {
         // We expect an extra character on windows due to carriage return.
         if (13 === buffer[dataSize - 1] && dataSize + 1 === received) {
           Expect.equals(13, buffer[dataSize - 1]);
           Expect.equals(10, buffer[dataSize]);
           buffer.removeLast();
-          process.close();
-        } else if (received === dataSize) {
-          process.close();
         }
       }
     }
 
-    output.write(data);
-    output.close();
-    input.onData = readData;
+    process.stdin.write(data);
+    process.stdin.close();
+    out.onData = readData;
+    process.stderr.onData = process.stderr.read;
   });
 }
 
 main() {
   // Run the test using the process_test binary.
   test(Process.start(getProcessTestFileName(),
                      const ["0", "1", "99", "0"]), 99);
 
   // Run the test using the dart binary with an echo script.
   // The test runner can be run from either the root or from runtime.
   var scriptFile = new File("tests/standalone/io/process_std_io_script.dart");
   if (!scriptFile.existsSync()) {
     scriptFile = new File("../tests/standalone/io/process_std_io_script.dart");
   }
   Expect.isTrue(scriptFile.existsSync());
   test(Process.start(new Options().executable, [scriptFile.name, "0"]), 0);
 }