Switch from interfaces to abstract classes in dart:io.

runtime/bin/process.dart

Index: runtime/bin/process.dart
diff --git a/runtime/bin/process.dart b/runtime/bin/process.dart
index c699670a291105a21818924f5e1f7cc0f798c347..9cb3bfdd2bbc9ccd6c73990dfec719f0e718ace9 100644
--- a/runtime/bin/process.dart
+++ b/runtime/bin/process.dart
@@ -32,7 +32,7 @@ class Process {
    */
   static Process start(String executable,
                        List<String> arguments,
-                       [ProcessOptions options]) {
+                       [ProcessOptions options = null]) {

[Søren Gjesse, 2012/09/18 09:34:16]

Isn't null the default default value for optional arguments ("= null" is
redundant)?

[Mads Ager (google), 2012/09/18 10:46:39]

Yes, it is redundant. Removed.

     return new _Process.start(executable, arguments, options);
   }
 
@@ -49,7 +49,7 @@ class Process {
    */
   static Future<ProcessResult> run(String executable,
                                    List<String> arguments,
-                                   [ProcessOptions options]) {
+                                   [ProcessOptions options = null]) {

[Søren Gjesse, 2012/09/18 09:34:16]

"= null" needed?

[Mads Ager (google), 2012/09/18 10:46:39]

Done.

     return _Process.run(executable, arguments, options);
   }
 
@@ -106,7 +106,7 @@ class Process {
    * of calling [kill] [onExit] is called. If the kill operation fails,
    * [onError] is called.
    */
-  abstract void kill([ProcessSignal signal]);
+  abstract void kill([ProcessSignal signal = ProcessSignal.SIGTERM]);
 
   /**
    * Terminates the streams of a process. [close] must be called on a
@@ -125,7 +125,7 @@ class Process {
  * [ProcessResult] represents the result of running a non-interactive
  * process started with [:Process.run:].
  */
-interface ProcessResult {
+abstract class ProcessResult {
   /**
    * Exit code for the process.
    */
@@ -229,7 +229,7 @@ class ProcessSignal {
 
 
 class ProcessException implements Exception {
-  const ProcessException([String this.message, int this.errorCode = 0]);
+  const ProcessException([String this.message = "", int this.errorCode = 0]);
   String toString() => "ProcessException: $message ($errorCode)";
 
   /**