Name the full path of a file that fails to hash [patch]

FileDeduplicator.Test/VerbOutputTests.cs

@@ -152,6 +152,26 @@ public void StatsReportsAFileItCannotHashAsUnreadable()
 		Assert.Contains("Duplicate groups: 0", output);
 	}
 
+	/// <summary>
+	/// A file that cannot be hashed is named by its full path, so the failing copy can be found
+	/// among others sharing its file name.
+	/// </summary>
+	[TestMethod]
+	public void AHashingErrorNamesTheFullPath()
+	{
+		// Arrange
+		using TempTree tree = new();
+		_ = tree.Write("one/IMG_0001.jpg", "alpha");
+		AbsoluteFilePath locked = tree.Write("two/IMG_0001.jpg", "beta");
+		using FileStream holder = new(locked.WeakString, FileMode.Open, FileAccess.ReadWrite, FileShare.None);
+
+		// Act
+		string output = ConsoleCapture.Run(new Stats { PathString = tree.Root.WeakString });
+
+		// Assert
+		Assert.Contains($"Error hashing {locked}:", output);
+	}
+
 	/// <summary>
 	/// A tree where every file hashes has no unreadable line at all.
 	/// </summary>

FileDeduplicator/FileHasher.cs

@@ -51,7 +51,9 @@ private static void ReportSkipped(AbsoluteFilePath filePath, Exception ex)
 	{
 		lock (ConsoleLock)
 		{
-			Console.WriteLine($"  Error hashing {filePath.FileName}: {ex.Message}");
+			// The full path, not the file name: index.js or IMG_0001.jpg can repeat dozens of times in
+			// one tree, and this line is the only place the failing copy is ever named.
+			Console.WriteLine($"  Error hashing {filePath}: {ex.Message}");
 		}
 	}