Catch file-not-found exception

lib/src/compiler/compiler.dart

Index: lib/src/compiler/compiler.dart
diff --git a/lib/src/compiler/compiler.dart b/lib/src/compiler/compiler.dart
index 6355dcfb17485850c1f094aaa6b85c127a0808e4..7be197079a8b450a7a9f402a6192c7ea86c35aa4 100644
--- a/lib/src/compiler/compiler.dart
+++ b/lib/src/compiler/compiler.dart
@@ -4,6 +4,7 @@
 
 import 'dart:collection' show HashSet;
 import 'package:args/args.dart' show ArgParser, ArgResults;
+import 'package:args/src/usage_exception.dart' show UsageException;
 import 'package:analyzer/analyzer.dart'
     show
         AnalysisError,
@@ -82,6 +83,11 @@ class ModuleCompiler {
             ' The file name is in the wrong format or was not found.');
       }
 
+      if (!source.exists()) {
+        throw new UsageException('Given file "$sourcePath" does not exist.',
+            'You need to pass at least one existing .dart file as an argument.');

[Jennifer Messerly, 2016/07/18 19:22:01]

long line

[stanm, 2016/07/18 21:37:29]

Thanks, I noticed that, but the formatter seems to be unable to deal with it, so
I didn't fix it immediately. I'll fix it now.

+      }
+
       // Ignore parts. They need to be handled in the context of their library.
       if (context.computeKindOf(source) == SourceKind.PART) {
         explicitParts.add(source);