Claim last bit for FileStatus.Nonexistent

Fix #307

Also, remove comment reference to GIT_STATUS_NOTFOUND which, ironically, does not exist

2 files changed, 16 insertions, 1 deletions

diff --git a/LibGit2Sharp.Tests/StatusFixture.cs b/LibGit2Sharp.Tests/StatusFixture.cs
index cd656895..a5e3520e 100644
--- a/LibGit2Sharp.Tests/StatusFixture.cs
+++ b/LibGit2Sharp.Tests/StatusFixture.cs
@@ -10,6 +10,21 @@ namespace LibGit2Sharp.Tests
     public class StatusFixture : BaseFixture
     {
         [Fact]
+        public void FileStatusFlagsAreMutuallyExclusive()
+        {
+            var overlaps = from FileStatus x in Enum.GetValues(typeof(FileStatus))
+                           where x != default(FileStatus)
+                           from FileStatus y in Enum.GetValues(typeof(FileStatus))
+                           where y != default(FileStatus)
+                           where x != y && (x & y) == y
+                           select string.Format("{0} overlaps with {1}", x, y);
+
+            var message = string.Join(Environment.NewLine, overlaps.ToArray());
+
+            Assert.Equal("", message);
+        }
+
+        [Fact]
         public void CanRetrieveTheStatusOfAFile()
         {
             using (var repo = new Repository(StandardTestRepoPath))
diff --git a/LibGit2Sharp/FileStatus.cs b/LibGit2Sharp/FileStatus.cs
index 4d663fd0..c0d2df00 100644
--- a/LibGit2Sharp/FileStatus.cs
+++ b/LibGit2Sharp/FileStatus.cs
@@ -11,7 +11,7 @@ namespace LibGit2Sharp
         /// <summary>
         ///   The file doesn't exist.
         /// </summary>
-        Nonexistent = -1, /* GIT_STATUS_NOTFOUND */
+        Nonexistent = (1 << 31),
 
         /// <summary>
         ///   The file hasn't been modified.