From 5f3b1e267a464bc85832a0eb05189f6c7a7a51cf Mon Sep 17 00:00:00 2001
From: Michael Kompanets <mkompanets@gmail.com>
Date: Thu, 2 Apr 2015 08:57:41 -0700
Subject: [PATCH 1/3] added errors class folder

---
 lib/to_nil/errors/could_not_nil.rb | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 lib/to_nil/errors/could_not_nil.rb

diff --git a/lib/to_nil/errors/could_not_nil.rb b/lib/to_nil/errors/could_not_nil.rb
new file mode 100644
index 0000000..30a2a31
--- /dev/null
+++ b/lib/to_nil/errors/could_not_nil.rb
@@ -0,0 +1,11 @@
+module ToNil
+  module Errors
+    class CouldNotNil < StandardError
+      attr_reader :object
+      def initialize(message, object)
+        super(message)
+        @object = object
+      end
+    end
+  end
+end
\ No newline at end of file

From 6bbb8f20572405146f594f9ff7c08452680b9bb5 Mon Sep 17 00:00:00 2001
From: Michael Kompanets <mkompanets@gmail.com>
Date: Thu, 2 Apr 2015 08:58:08 -0700
Subject: [PATCH 2/3] added errors require and to_nil with a bang method

---
 lib/to_nil.rb | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/to_nil.rb b/lib/to_nil.rb
index 1d0a22e..5a4f45c 100644
--- a/lib/to_nil.rb
+++ b/lib/to_nil.rb
@@ -1,10 +1,18 @@
 require "to_nil/version"
 
+# Errors
+require "to_nil/errors/could_not_nil"
+
 module ToNil
   module ObjectExtension
     def to_nil
       nil
     end
+
+    def to_nil!
+      self.to_nil == nil || raise(Errors::CouldNotNil.new("refused to nil", self))
+      nil
+    end
   end
 end
 

From c13fb73764d1e3bdaa83ef4daea55ab34ca03f17 Mon Sep 17 00:00:00 2001
From: Michael Kompanets <mkompanets@gmail.com>
Date: Thu, 2 Apr 2015 08:58:45 -0700
Subject: [PATCH 3/3] to nil with a bang spec

---
 spec/to_nil_spec.rb | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/spec/to_nil_spec.rb b/spec/to_nil_spec.rb
index 6ddbf92..e7e6e63 100644
--- a/spec/to_nil_spec.rb
+++ b/spec/to_nil_spec.rb
@@ -9,9 +9,22 @@
     it "returns nil for a #{klass} instance" do
       expect(klass.new.to_nil).to be_nil
     end
+
+    it "returns nil for a #{klass} instance with a bang" do
+      expect(klass.new.to_nil!).to be_nil
+    end
+
+    it "raises an error when #{klass} instance is not nil with a bang" do
+      allow_any_instance_of(klass).to receive(:to_nil).and_return('Not Nil!')
+      expect{klass.new.to_nil!}.to raise_error
+    end
   end
 
   it "returns nil for nil.to_nil" do
     expect(nil.to_nil).to be_nil
   end
+
+  it "returns nil for nil.to_nil with a bang" do
+    expect(nil.to_nil!).to be_nil
+  end
 end