1 files changed, 21 insertions, 0 deletions
diff --git a/Library/Homebrew/exceptions.rb b/Library/Homebrew/exceptions.rb
index 5865eb98e..986fdeaa9 100644
--- a/Library/Homebrew/exceptions.rb
+++ b/Library/Homebrew/exceptions.rb
@@ -260,3 +260,24 @@ class ChecksumMismatchError < RuntimeError
     super + advice.to_s
   end
 end
+
+class ResourceMissingError < ArgumentError
+  def initialize formula, resource
+    @formula = formula
+    @resource = resource
+  end
+
+  def to_s
+    "Formula #{@formula} does not define resource \"#{@resource}\"."
+  end
+end
+
+class DuplicateResourceError < ArgumentError
+  def initialize resource
+    @resource = resource
+  end
+
+  def to_s
+    "Resource \"#{@resource}\" defined more than once."
+  end
+end