1 files changed, 11 insertions, 0 deletions
diff --git a/Library/Homebrew/exceptions.rb b/Library/Homebrew/exceptions.rb
index 841cc8b39..d49630e0e 100644
--- a/Library/Homebrew/exceptions.rb
+++ b/Library/Homebrew/exceptions.rb
@@ -98,6 +98,17 @@ class TapUnavailableError < RuntimeError
   end
 end
 
+class TapPinStatusError < RuntimeError
+  attr_reader :name, :pinned
+
+  def initialize name, pinned
+    @name = name
+    @pinned = pinned
+
+    super pinned ? "#{name} is already pinned." : "#{name} is already unpinned."
+  end
+end
+
 class OperationInProgressError < RuntimeError
   def initialize(name)
     message = <<-EOS.undent