adds array bounds checking

frog/frog_options.dart

Index: frog/frog_options.dart
diff --git a/frog/frog_options.dart b/frog/frog_options.dart
index 67e99a00f0cebf7a9437f5fa67622a5d2f1005f3..5ce8ed5e9e07e71e08da65994c3337d31d7de169 100644
--- a/frog/frog_options.dart
+++ b/frog/frog_options.dart
@@ -39,6 +39,10 @@ class FrogOptions {
   bool compileOnly = false;
   bool inferTypes = false;
 
+  // Specifies non-compliant behavior where array bounds checks are
+  // not implemented in generated code.
+  bool disableBoundsChecks = false;
+
   // Message support
   bool throwOnErrors = false;
   bool throwOnWarnings = false;
@@ -150,6 +154,15 @@ class FrogOptions {
           inferTypes = true;
           break;
 
+        case '--checked':
+          enableTypeChecks = true;
+          enableAsserts = true;
+          break;
+
+        case '--unchecked':
+          disableBoundsChecks = true;
+          break;
+
         default:
           if (arg.endsWith('.dart')) {
             dartScript = arg;