Ignore a few 'unused' values in the _FilePermission enum (dart-lang/io#54)
diff --git a/pkgs/io/lib/src/permissions.dart b/pkgs/io/lib/src/permissions.dart
index 789d327..e890373 100644
--- a/pkgs/io/lib/src/permissions.dart
+++ b/pkgs/io/lib/src/permissions.dart
@@ -8,8 +8,10 @@
/// What type of permission is granted to a file based on file permission roles.
enum _FilePermission {
execute,
- write,
- read,
+ // Although these two values are unused, their positions in the enum are
+ // meaningful.
+ write, // ignore: unused_field
+ read, // ignore: unused_field
setGid,
setUid,
sticky,
