From 6f3710e317fd8a31ce382f298e615a53e3591220 Mon Sep 17 00:00:00 2001
From: Devon Carew <devoncarew@gmail.com>
Date: Wed, 16 Sep 2015 16:33:29 -0700
Subject: [PATCH] catch parse exceptions from args

---
 pkg/dev_compiler/bin/dartdevc.dart | 10 +++++++++-
 pkg/dev_compiler/bin/devrun.dart   | 11 +++++++++--
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/pkg/dev_compiler/bin/dartdevc.dart b/pkg/dev_compiler/bin/dartdevc.dart
index 2a406d160d38..3e906b30bd78 100755
--- a/pkg/dev_compiler/bin/dartdevc.dart
+++ b/pkg/dev_compiler/bin/dartdevc.dart
@@ -23,7 +23,15 @@ void _showUsageAndExit() {
 }
 
 main(List<String> args) async {
-  var options = validateOptions(args);
+  var options;
+
+  try {
+    options = validateOptions(args);
+  } on FormatException catch (e) {
+    print('${e.message}\n');
+    _showUsageAndExit();
+  }
+
   if (options == null || options.help) _showUsageAndExit();
 
   setupLogger(options.logLevel, print);
diff --git a/pkg/dev_compiler/bin/devrun.dart b/pkg/dev_compiler/bin/devrun.dart
index 7e0bbabf96b9..4050ac927941 100755
--- a/pkg/dev_compiler/bin/devrun.dart
+++ b/pkg/dev_compiler/bin/devrun.dart
@@ -29,10 +29,17 @@ main(List<String> args) async {
     ..add('--arrow-fn-bind-this')
     ..addAll(args);
 
-  CompilerOptions options = validateOptions(args, forceOutDir: true);
-  if (options == null || options.help) {
+  CompilerOptions options;
+
+  try {
+    options = validateOptions(args, forceOutDir: true);
+  } on FormatException catch (e) {
+    print('${e.message}\n');
     _showUsageAndExit();
   }
+
+  if (options == null || options.help) _showUsageAndExit();
+
   if (options.inputs.length != 1) {
     stderr.writeln("Please only specify one input to run");
     _showUsageAndExit();