diff --git a/.rubocop_rspec_base.yml b/.rubocop_rspec_base.yml
index 1d323b623..29d06e357 100644
--- a/.rubocop_rspec_base.yml
+++ b/.rubocop_rspec_base.yml
@@ -1,4 +1,4 @@
-# This file was generated on 2020-03-30T16:31:25+02:00 from the rspec-dev repo.
+# This file was generated on 2020-04-03T18:53:23+03:00 from the rspec-dev repo.
 # DO NOT modify it by hand as your changes will get lost the next time it is generated.
 
 # This file contains defaults for RSpec projects. Individual projects
diff --git a/.travis.yml b/.travis.yml
index c5b1a114b..2194559ca 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,4 @@
-# This file was generated on 2020-03-30T16:31:25+02:00 from the rspec-dev repo.
+# This file was generated on 2020-04-03T18:53:23+03:00 from the rspec-dev repo.
 # DO NOT modify it by hand as your changes will get lost the next time it is generated.
 
 # In order to install old Rubies, we need to use old Ubuntu distibution.
@@ -22,10 +22,10 @@ rvm:
   - 2.1
   - 2.2.10
   - 2.3.8
-  - 2.4.9
-  - 2.5.7
-  - 2.6.5
-  - 2.7.0
+  - 2.4.10
+  - 2.5.8
+  - 2.6.6
+  - 2.7.1
   - ruby-head
   - ree
   - rbx-3
@@ -38,6 +38,8 @@ matrix:
   include:
     - rvm: jruby-1.7
       env: JRUBY_OPTS='--dev --1.8'
+    - rvm: 2.7.1
+      env: DIFF_LCS_VERSION='~> 1.3.0'
   allow_failures:
     - rvm: jruby-head
     - rvm: ruby-head
diff --git a/Changelog.md b/Changelog.md
index 4933612da..3c6d8641a 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -5,6 +5,8 @@ Enhancements:
 * Add the ability to set a custom error generator in `MessageExpectation`.
   This will allow rspec-expectations to inject a custom failure message.
   (Benoit Tigeot and Nicolas Zermati, #1312)
+* Return the result of the block passed to `RSpec::Mocks.with_temporary_scope`
+  when block run. (@expeehaa, #1329)
 
 ### 3.9.1 / 2019-12-31
 [Full Changelog](http://github.com/rspec/rspec-mocks/compare/v3.9.0...v3.9.1)
diff --git a/Gemfile b/Gemfile
index 727fdfb11..14f719846 100644
--- a/Gemfile
+++ b/Gemfile
@@ -12,6 +12,20 @@ branch = File.read(File.expand_path("../maintenance-branch", __FILE__)).chomp
   end
 end
 
+if RUBY_VERSION < '1.9.3'
+  gem 'rake', '< 11.0.0' # rake 11 requires Ruby 1.9.3 or later
+elsif RUBY_VERSION < '2.0.0'
+  gem 'rake', '< 12.0.0' # rake 12 requires Ruby 2.0.0 or later
+else
+  gem 'rake', '> 12.3.2'
+end
+
+if ENV['DIFF_LCS_VERSION']
+  gem 'diff-lcs', ENV['DIFF_LCS_VERSION']
+else
+  gem 'diff-lcs', '~> 1.4', '>= 1.4.3'
+end
+
 gem 'yard', '~> 0.9.24', :require => false
 
 # No need to run rubocop on earlier versions
diff --git a/appveyor.yml b/appveyor.yml
index 13e397a17..06cc874aa 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,4 +1,4 @@
-# This file was generated on 2020-03-30T16:31:25+02:00 from the rspec-dev repo.
+# This file was generated on 2020-04-03T18:53:23+03:00 from the rspec-dev repo.
 # DO NOT modify it by hand as your changes will get lost the next time it is generated.
 
 version: "{build}"
diff --git a/lib/rspec/mocks.rb b/lib/rspec/mocks.rb
index 95ea1de4c..297779e5a 100644
--- a/lib/rspec/mocks.rb
+++ b/lib/rspec/mocks.rb
@@ -87,12 +87,15 @@ def self.expect_message(subject, message, opts={}, &block)
 
     # Call the passed block and verify mocks after it has executed. This allows
     # mock usage in arbitrary places, such as a `before(:all)` hook.
+    #
+    # @return [Object] the return value from the block
     def self.with_temporary_scope
       setup
 
       begin
-        yield
+        result = yield
         verify
+        result
       ensure
         teardown
       end
diff --git a/lib/rspec/mocks/message_expectation.rb b/lib/rspec/mocks/message_expectation.rb
index cb5a39922..d999dc0f8 100644
--- a/lib/rspec/mocks/message_expectation.rb
+++ b/lib/rspec/mocks/message_expectation.rb
@@ -98,7 +98,7 @@ def and_return(first_value, *values)
       #   expect(counter.count).to eq(original_count + 1)
       def and_call_original
         wrap_original(__method__) do |original, *args, &block|
-          original.call(*args, &block)
+          __call_original(original, *args, &block)
         end
       end
 
@@ -354,6 +354,25 @@ def to_s
       end
       alias inspect to_s
 
+      private
+
+      if RSpec::Support::RubyFeatures.kw_args_supported?
+        def __call_original(original, *args, &block)
+          if RSpec::Support::MethodSignature.new(original).has_kw_args_in?(args)
+            binding.eval(<<-CODE, __FILE__, __LINE__)
+            kwargs = args.pop
+            original.call(*args, **kwargs, &block)
+            CODE
+          else
+            original.call(*args, &block)
+          end
+        end
+      else
+        def __call_original(original, *args, &block)
+          original.call(*args, &block)
+        end
+      end
+
       # @private
       # Contains the parts of `MessageExpectation` that aren't part of
       # rspec-mocks' public API. The class is very big and could really use
diff --git a/rspec-mocks.gemspec b/rspec-mocks.gemspec
index 21e9a50e9..9fd5e9a95 100644
--- a/rspec-mocks.gemspec
+++ b/rspec-mocks.gemspec
@@ -45,7 +45,7 @@ Gem::Specification.new do |s|
 
   s.add_runtime_dependency "diff-lcs", ">= 1.2.0", "< 2.0"
 
-  s.add_development_dependency 'rake',     '~> 10.0.0'
+  s.add_development_dependency 'rake',     '> 10.0.0'
   s.add_development_dependency 'cucumber', '~> 1.3.15'
   s.add_development_dependency 'aruba',    '~> 0.14.10'
   s.add_development_dependency 'minitest', '~> 5.2'
diff --git a/script/clone_all_rspec_repos b/script/clone_all_rspec_repos
index a6e915e81..97741443b 100755
--- a/script/clone_all_rspec_repos
+++ b/script/clone_all_rspec_repos
@@ -1,5 +1,5 @@
 #!/bin/bash
-# This file was generated on 2020-03-30T16:31:25+02:00 from the rspec-dev repo.
+# This file was generated on 2020-04-03T18:53:23+03:00 from the rspec-dev repo.
 # DO NOT modify it by hand as your changes will get lost the next time it is generated.
 
 set -e
diff --git a/script/functions.sh b/script/functions.sh
index efc219177..06e8320c0 100644
--- a/script/functions.sh
+++ b/script/functions.sh
@@ -1,4 +1,4 @@
-# This file was generated on 2020-03-30T16:31:25+02:00 from the rspec-dev repo.
+# This file was generated on 2020-04-03T18:53:23+03:00 from the rspec-dev repo.
 # DO NOT modify it by hand as your changes will get lost the next time it is generated.
 
 SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
diff --git a/script/predicate_functions.sh b/script/predicate_functions.sh
index 4e40628e4..6320130f2 100644
--- a/script/predicate_functions.sh
+++ b/script/predicate_functions.sh
@@ -1,4 +1,4 @@
-# This file was generated on 2020-03-30T16:31:25+02:00 from the rspec-dev repo.
+# This file was generated on 2020-04-03T18:53:23+03:00 from the rspec-dev repo.
 # DO NOT modify it by hand as your changes will get lost the next time it is generated.
 
 function is_mri {
diff --git a/script/run_build b/script/run_build
index 851d576ce..493fc3bd1 100755
--- a/script/run_build
+++ b/script/run_build
@@ -1,5 +1,5 @@
 #!/bin/bash
-# This file was generated on 2020-03-30T16:31:25+02:00 from the rspec-dev repo.
+# This file was generated on 2020-04-03T18:53:23+03:00 from the rspec-dev repo.
 # DO NOT modify it by hand as your changes will get lost the next time it is generated.
 
 set -e
diff --git a/script/travis_functions.sh b/script/travis_functions.sh
index 7f0b6d965..3426b5562 100644
--- a/script/travis_functions.sh
+++ b/script/travis_functions.sh
@@ -1,4 +1,4 @@
-# This file was generated on 2020-03-30T16:31:25+02:00 from the rspec-dev repo.
+# This file was generated on 2020-04-03T18:53:23+03:00 from the rspec-dev repo.
 # DO NOT modify it by hand as your changes will get lost the next time it is generated.
 
 # Taken from:
diff --git a/script/update_rubygems_and_install_bundler b/script/update_rubygems_and_install_bundler
index c256d80c3..ae94b87a6 100755
--- a/script/update_rubygems_and_install_bundler
+++ b/script/update_rubygems_and_install_bundler
@@ -1,5 +1,5 @@
 #!/bin/bash
-# This file was generated on 2020-03-30T16:31:25+02:00 from the rspec-dev repo.
+# This file was generated on 2020-04-03T18:53:23+03:00 from the rspec-dev repo.
 # DO NOT modify it by hand as your changes will get lost the next time it is generated.
 
 set -e
diff --git a/spec/rspec/mocks/and_call_original_spec.rb b/spec/rspec/mocks/and_call_original_spec.rb
index 8bb20d563..25c5a85cc 100644
--- a/spec/rspec/mocks/and_call_original_spec.rb
+++ b/spec/rspec/mocks/and_call_original_spec.rb
@@ -12,6 +12,19 @@ def meth_2(x)
           yield x, :additional_yielded_arg
         end
 
+        if RSpec::Support::RubyFeatures.kw_args_supported?
+          binding.eval(<<-CODE, __FILE__, __LINE__)
+          def meth_3(keyword_arg: nil)
+            keyword_arg
+          end
+
+          def initialize(initialize_arg: nil)
+            @initialize_arg = initialize_arg
+          end
+          attr_reader :initialize_arg
+          CODE
+        end
+
         def self.new_instance
           new
         end
@@ -59,6 +72,24 @@ def self.new_instance
       expect(value).to eq([:submitted_arg, :additional_yielded_arg])
     end
 
+    if RSpec::Support::RubyFeatures.kw_args_supported?
+      it 'works with keyword arguments' do
+        expect(instance).to receive(:meth_3).and_call_original
+        binding.eval(<<-CODE, __FILE__, __LINE__)
+        expect(instance.meth_3(keyword_arg: :original_arg)).to eq :original_arg
+        CODE
+      end
+
+      it 'works with keyword arguments for .initialize' do
+        expect(klass).to receive(:new).with(initialize_arg: :initialize_arg)
+          .and_call_original
+        binding.eval(<<-CODE, __FILE__, __LINE__)
+        instance = klass.new(initialize_arg: :initialize_arg)
+        expect(instance.initialize_arg).to eq :initialize_arg
+        CODE
+      end
+    end
+
     it 'errors when you pass through the wrong number of args' do
       expect(instance).to receive(:meth_1).and_call_original
       expect(instance).to receive(:meth_2).twice.and_call_original
diff --git a/spec/rspec/mocks/diffing_spec.rb b/spec/rspec/mocks/diffing_spec.rb
index e2a1b8a49..3b1f91edf 100644
--- a/spec/rspec/mocks/diffing_spec.rb
+++ b/spec/rspec/mocks/diffing_spec.rb
@@ -2,6 +2,8 @@
 require "pp"
 
 RSpec.describe "Diffs printed when arguments don't match" do
+  include RSpec::Support::Spec::DiffHelpers
+
   before do
     allow(RSpec::Mocks.configuration).to receive(:color?).and_return(false)
   end
@@ -68,7 +70,7 @@
         expect(d).to receive(:foo).with(expected_hash)
         expect {
           d.foo(:bad => :hash)
-        }.to fail_with(/\A#<Double "double"> received :foo with unexpected arguments\n  expected: \(#{hash_regex_inspect expected_hash}\)\n       got: \(#{hash_regex_inspect actual_hash}\)\nDiff:\n@@ \-1\,2 \+1\,2 @@\n\-\[#{hash_regex_inspect expected_hash}\]\n\+\[#{hash_regex_inspect actual_hash}\]\n\z/)
+        }.to fail_with(/\A#<Double "double"> received :foo with unexpected arguments\n  expected: \(#{hash_regex_inspect expected_hash}\)\n       got: \(#{hash_regex_inspect actual_hash}\)\nDiff:\n@@ #{Regexp.escape one_line_header} @@\n\-\[#{hash_regex_inspect expected_hash}\]\n\+\[#{hash_regex_inspect actual_hash}\]\n\z/)
       end
     end
 
@@ -101,7 +103,7 @@ def hash_regex_inspect(hash)
         expect(d).to receive(:foo).with([:a, :b, :c])
         expect {
           d.foo([])
-        }.to fail_with("#<Double \"double\"> received :foo with unexpected arguments\n  expected: ([:a, :b, :c])\n       got: ([])\nDiff:\n@@ -1,2 +1,2 @@\n-[[:a, :b, :c]]\n+[[]]\n")
+        }.to fail_with("#<Double \"double\"> received :foo with unexpected arguments\n  expected: ([:a, :b, :c])\n       got: ([])\nDiff:\n@@ #{one_line_header} @@\n-[[:a, :b, :c]]\n+[[]]\n")
       end
     end
 
@@ -117,7 +119,7 @@ def hash_regex_inspect(hash)
             d.foo([])
           }.to fail_with("#<Double \"double\"> received :foo with unexpected arguments\n" \
             "  expected: (#{collab_inspect})\n" \
-            "       got: ([])\nDiff:\n@@ -1,2 +1,2 @@\n-[#{collab_inspect}]\n+[[]]\n")
+            "       got: ([])\nDiff:\n@@ #{one_line_header} @@\n-[#{collab_inspect}]\n+[[]]\n")
         end
       end
     end
@@ -136,7 +138,7 @@ def hash_regex_inspect(hash)
             d.foo([:a, :b])
           }.to fail_with("#<Double \"double\"> received :foo with unexpected arguments\n" \
             "  expected: (#{collab_description})\n" \
-            "       got: ([:a, :b])\nDiff:\n@@ -1,2 +1,2 @@\n-[\"#{collab_description}\"]\n+[[:a, :b]]\n")
+            "       got: ([:a, :b])\nDiff:\n@@ #{one_line_header} @@\n-[\"#{collab_description}\"]\n+[[:a, :b]]\n")
         end
       end
     end
@@ -164,7 +166,7 @@ def inspect
             d.foo([:a, :b])
           }.to fail_with("#<Double \"double\"> received :foo with unexpected arguments\n" \
             "  expected: (#{collab_inspect})\n" \
-            "       got: ([:a, :b])\nDiff:\n@@ -1,2 +1,2 @@\n-[#{collab_pp}]\n+[[:a, :b]]\n")
+            "       got: ([:a, :b])\nDiff:\n@@ #{one_line_header} @@\n-[#{collab_pp}]\n+[[:a, :b]]\n")
         end
       end
     end
diff --git a/spec/rspec/mocks/formatting_spec.rb b/spec/rspec/mocks/formatting_spec.rb
index a08b1776e..aed05bed3 100644
--- a/spec/rspec/mocks/formatting_spec.rb
+++ b/spec/rspec/mocks/formatting_spec.rb
@@ -3,6 +3,7 @@
 
 RSpec.describe "Test doubles format well in failure messages" do
   include RSpec::Matchers::FailMatchers
+  include RSpec::Support::Spec::DiffHelpers
 
   RSpec::Matchers.define :format_in_failures_as do |expected|
     match do |dbl|
@@ -101,7 +102,7 @@ def actual_formatting(double)
     }.to fail_with(<<-EOS.gsub(/^\s+\|/, ''))
       |expected [#<Double "Foo">] to include #<Double "Bar">
       |Diff:
-      |@@ -1,2 +1,2 @@
+      |@@ #{one_line_header} @@
       |-[#<Double "Bar">]
       |+[#<Double "Foo">]
     EOS
diff --git a/spec/rspec/mocks_spec.rb b/spec/rspec/mocks_spec.rb
index 8257ba994..771431e63 100644
--- a/spec/rspec/mocks_spec.rb
+++ b/spec/rspec/mocks_spec.rb
@@ -209,6 +209,10 @@
       }.to raise_error("boom") # rather than MockExpectationError
     end
 
+    it 'returns the result of the passed block' do
+      expect(RSpec::Mocks.with_temporary_scope { 5 }).to eq 5
+    end
+
     def capture_error
       yield
     rescue Exception => @error