yield the example to the block passed to let or subject

lib/rspec/core/memoized_helpers.rb

@@ -195,8 +195,10 @@ def let(name, &block)
 
           # Apply the memoization. The method has been defined in an ancestor
           # module so we can use `super` here to get the value.
-          define_method(name) do
-            __memoized.fetch(name) { |k| __memoized[k] = super(&nil) }
+          if block.arity == 1
+            define_method(name) { __memoized.fetch(name) { |k| __memoized[k] = super(@_current_rspec_example, &nil) } }
+          else
+            define_method(name) { __memoized.fetch(name) { |k| __memoized[k] = super(&nil) } }
           end
         end
 

spec/rspec/core/memoized_helpers_spec.rb

@@ -56,6 +56,18 @@ def subject_value_for(describe_arg, &block)
     end
 
     describe "explicit subject" do
+      it "yields the example in which it is eval'd" do
+        example_yielded_to_subject = nil
+        example_yielded_to_example = nil
+
+        group = ExampleGroup.describe
+        group.subject { |e| example_yielded_to_subject = e }
+        group.example { |e| subject; example_yielded_to_example = e }
+        group.run
+
+        expect(example_yielded_to_subject).to eq example_yielded_to_example
+      end
+
       [false, nil].each do |falsy_value|
         context "with a value of #{falsy_value.inspect}" do
           it "is evaluated once per example" do
@@ -184,6 +196,18 @@ def define_and_run_group
       end
 
       describe "with a name" do
+        it "yields the example in which it is eval'd" do
+          example_yielded_to_subject = nil
+          example_yielded_to_example = nil
+
+          group = ExampleGroup.describe
+          group.subject(:foo) { |e| example_yielded_to_subject = e }
+          group.example       { |e| foo; example_yielded_to_example = e }
+          group.run
+
+          expect(example_yielded_to_subject).to eq example_yielded_to_example
+        end
+
         it "defines a method that returns the memoized subject" do
           list_value_1 = list_value_2 = subject_value_1 = subject_value_2 = nil
 
@@ -516,6 +540,15 @@ def count
       expect(@nil_value_count).to eq(1)
     end
 
+    let(:yield_the_example) do |example_yielded_to_let|
+      @example_yielded_to_let = example_yielded_to_let
+    end
+
+    it "yields the example" do |example_yielded_to_example|
+      yield_the_example
+      expect(@example_yielded_to_let).to equal example_yielded_to_example
+    end
+
     let(:regex_with_capture) { %r[RegexWithCapture(\d)] }
 
     it 'does not pass the block up the ancestor chain' do