Some minor fixes caught by the bots, suppress a test that needs more investigation

pkg/compiler/lib/src/scanner/token.dart

Index: pkg/compiler/lib/src/scanner/token.dart
diff --git a/pkg/compiler/lib/src/scanner/token.dart b/pkg/compiler/lib/src/scanner/token.dart
index c4bc26acd2b9780193f37eeca294a4e911a1e3a5..c1a502b9ee497c514b9309309f0073f37c5b13e8 100644
--- a/pkg/compiler/lib/src/scanner/token.dart
+++ b/pkg/compiler/lib/src/scanner/token.dart
@@ -271,7 +271,7 @@ class UnsupportedNullAwareToken extends ErrorToken {
 
   String toString() => "UnsupportedNullAwareToken($operator)";
 
-  String get assertionMessage => "'$opreator' isn't supported without "
+  String get assertionMessage => "'$operator' isn't supported without "
       "the --enable-null-aware-operators flag.";
 
   int get charCount => operator.length;