diff --git a/.circleci/config.yml b/.circleci/config.yml
index 6b2a048ab..c47c793db 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1,11 +1,10 @@
 version: 2
 
 aliases:
-  - &test-base
+  - &test-base-legacy
     working_directory: /tmp/drafter
     environment:
       CXXFLAGS: '-Werror -Wno-error=unused-function'
-
     steps:
       - checkout
       - run: git submodule update --init --recursive
@@ -18,43 +17,74 @@ aliases:
           name: Test
           command: make test -j4
 
-  - &test-clang-base
-    <<: *test-base
-    environment:
-      CXXFLAGS: '-Werror -Wno-error=unused-function -Wno-error=missing-braces'
+  - &test-base
+    working_directory: /tmp/drafter
 
   - &tag-filter
     filters:
       tags:
         only: /^v.*/
 
+  - &clang-debug
+    run:
+      name: Build drafter/debug with clang
+      command: |
+          ctest -VV -j4 -S cmake/unix.cmake -DCTEST_BUILD_TYPE=Debug -DCTEST_BUILD_NAME="clang $(c++ -dumpversion)"
+
+  - &clang-release
+    run:
+      name: Build drafter/release with clang
+      command: |
+          ctest -VV -j4 -S cmake/unix.cmake -DCTEST_BUILD_TYPE=Release -DCTEST_BUILD_NAME="clang $(c++ -dumpversion)"
+
+  - &gcc-debug
+    run:
+      name: Build drafter/debug with gcc
+      command: |
+          ctest -VV -j4 -S cmake/unix.cmake -DCTEST_BUILD_TYPE=Debug -DCTEST_BUILD_NAME="gcc $(c++ -dumpversion)"
+
+  - &gcc-release
+    run:
+      name: Build drafter/release with gcc
+      command: |
+          ctest -VV -j4 -S cmake/unix.cmake -DCTEST_BUILD_TYPE=Release -DCTEST_BUILD_NAME="gcc $(c++ -dumpversion)"
+
+  - &update-submodules
+    run:
+      name: Update submodules
+      command: 'git submodule update --init --recursive'
+
 workflows:
   version: 2
 
   drafter:
     jobs:
       - lint
-      - test-gcc5.4: *tag-filter
-      - test-gcc6: *tag-filter
-      - test-gcc7: *tag-filter
-      #- test-gcc8: *tag-filter
-      - test-clang4: *tag-filter
-      - test-clang5: *tag-filter
-      - test-clang6: *tag-filter
-      - test-xcode9: *tag-filter
-      - test-integration: *tag-filter
+      - test-gcc-49-debug: *tag-filter
+      - test-gcc-49-release: *tag-filter
+      - test-gcc-latest-debug: *tag-filter
+      - test-gcc-latest-release: *tag-filter
+      - test-clang-4-debug: *tag-filter
+      - test-clang-4-release: *tag-filter
+      - test-clang-latest-debug: *tag-filter
+      - test-clang-latest-release: *tag-filter
+      - test-osx-release: *tag-filter
+      - test-osx-debug: *tag-filter
+      - test-gyp: *tag-filter
       - test-valgrind: *tag-filter
       - release:
           requires:
-            - test-gcc5.4
-            - test-gcc6
-            - test-gcc7
-            #- test-gcc8
-            - test-clang4
-            - test-clang5
-            - test-clang6
-            - test-xcode9
-            - test-integration
+            - test-gcc-49-debug
+            - test-gcc-49-release
+            - test-gcc-latest-debug
+            - test-gcc-latest-release
+            - test-clang-4-debug
+            - test-clang-4-release
+            - test-clang-latest-debug
+            - test-clang-latest-release
+            - test-osx-release
+            - test-osx-debug
+            - test-gyp
             - test-valgrind
           filters:
             tags:
@@ -72,65 +102,107 @@ jobs:
       - run: git submodule update --init --recursive
       - run: ./tools/clang-format-check.sh
 
-  test-gcc5.4:
-    <<: *test-base
+  test-gyp:
+    <<: *test-base-legacy
     docker:
       - image: gcc:5.4
 
-  test-gcc6:
+  test-gcc-49-debug:
     <<: *test-base
+    steps:
+      - checkout
+      - <<: *update-submodules
+      - <<: *gcc-debug
     docker:
-      - image: gcc:6
+      - image: apiaryio/drafter-ci:gcc-4.9
 
-  test-gcc7:
+  test-gcc-49-release:
     <<: *test-base
+    steps:
+      - checkout
+      - <<: *update-submodules
+      - <<: *gcc-release
     docker:
-      - image: gcc:7
+      - image: apiaryio/drafter-ci:gcc-4.9
 
-  test-gcc8:
+  test-gcc-latest-debug:
     <<: *test-base
+    steps:
+      - checkout
+      - <<: *update-submodules
+      - <<: *gcc-debug
     docker:
-      - image: gcc:8
+      - image: apiaryio/drafter-ci:gcc-latest
 
-  test-clang4:
-    <<: *test-clang-base
+  test-gcc-latest-release:
+    <<: *test-base
+    steps:
+      - checkout
+      - <<: *update-submodules
+      - <<: *gcc-release
     docker:
-      - image: apiaryio/clang:4
+      - image: apiaryio/drafter-ci:gcc-latest
 
-  test-clang5:
-    <<: *test-clang-base
+  test-clang-4-debug:
+    <<: *test-base
+    steps:
+      - checkout
+      - <<: *update-submodules
+      - <<: *clang-debug
     docker:
-      - image: apiaryio/clang:5
+      - image: apiaryio/drafter-ci:clang-4.0
 
-  test-clang6:
-    <<: *test-clang-base
+  test-clang-4-release:
+    <<: *test-base
+    steps:
+      - checkout
+      - <<: *update-submodules
+      - <<: *clang-release
     docker:
-      - image: apiaryio/clang:6
-
-  test-xcode9:
-    <<: *test-clang-base
-    macos:
-      xcode: "9.4.0"
+      - image: apiaryio/drafter-ci:clang-4.0
 
-  test-integration:
+  test-clang-latest-debug:
+    <<: *test-base
+    steps:
+      - checkout
+      - <<: *update-submodules
+      - <<: *clang-debug
     docker:
-      - image: circleci/ruby:2.5.1
-    working_directory: /tmp/drafter
+      - image: apiaryio/drafter-ci:clang-latest
 
+  test-clang-latest-release:
+    <<: *test-base
     steps:
       - checkout
-      - run: git submodule update --init --recursive
+      - <<: *update-submodules
+      - <<: *clang-release
+    docker:
+      - image: apiaryio/drafter-ci:clang-latest
 
-      - run:
-          name: Build
-          command: ./configure && make -j4
+  test-osx-debug:
+    <<: *test-base
+    steps:
+      - checkout
+      - <<: *update-submodules
+      - run: sudo bundle install
+      - run: brew install cmake
+      - <<: *clang-debug
+    macos:
+      xcode: "9.4.0"
 
-      - run:
-          name: Integration Test
-          command: bundle install && bundle exec cucumber
+  test-osx-release:
+    <<: *test-base
+    steps:
+      - checkout
+      - <<: *update-submodules
+      - run: sudo bundle install
+      - run: brew install cmake
+      - <<: *clang-release
+    macos:
+      xcode: "9.4.0"
 
   test-valgrind:
-    <<: *test-base
+    <<: *test-base-legacy
     docker:
       - image: gcc:7
 
@@ -163,5 +235,6 @@ jobs:
 
     steps:
       - checkout
-      - run: git submodule update --init --recursive
+      - <<: *update-submodules
       - run: ./tools/release.sh
+
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9927091f3..511236ee6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.4 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.6 FATAL_ERROR)
 
 message(STATUS "Testing dependencies ${BUILD_TESTING_DEPENDENCIES}.")
 
@@ -28,12 +28,12 @@ add_subdirectory(ext/boost_1_66_0 EXCLUDE_FROM_ALL)
 add_subdirectory(ext/variant EXCLUDE_FROM_ALL)
 
 message(STATUS "Setting up tests for production...")
-set(BUILD_TESTING ON)
 add_subdirectory(test/vendor/Catch EXCLUDE_FROM_ALL)
 add_subdirectory(test/vendor/dtl EXCLUDE_FROM_ALL)
+
+enable_testing()
 include(CTest)
 include(test/vendor/Catch/contrib/Catch.cmake)
-enable_testing()
 
 # targets developed in this super project
 add_subdirectory(ext/snowcrash/ext/markdown-parser EXCLUDE_FROM_ALL)
diff --git a/CTestConfig.cmake b/CTestConfig.cmake
new file mode 100644
index 000000000..03a75d4d3
--- /dev/null
+++ b/CTestConfig.cmake
@@ -0,0 +1,12 @@
+## This file should be placed in the root directory of your project.
+## Then modify the CMakeLists.txt file in the root directory of your
+## project to incorporate the testing dashboard.
+##
+
+set(CTEST_PROJECT_NAME "Drafter")
+set(CTEST_NIGHTLY_START_TIME "01:00:00 UTC")
+
+set(CTEST_DROP_METHOD "http")
+set(CTEST_DROP_SITE "my.cdash.org")
+set(CTEST_DROP_LOCATION "/submit.php?project=Drafter")
+set(CTEST_DROP_SITE_CDASH TRUE)
diff --git a/cmake/unix.cmake b/cmake/unix.cmake
new file mode 100644
index 000000000..b60a4cb9d
--- /dev/null
+++ b/cmake/unix.cmake
@@ -0,0 +1,43 @@
+cmake_minimum_required(VERSION 3.6)
+
+if("${CTEST_BUILD_NAME}" STREQUAL "")
+    set(CTEST_BUILD_NAME "${CTEST_BUILD_TYPE}")
+else()
+    set(CTEST_BUILD_NAME "${CTEST_BUILD_TYPE}/${CTEST_BUILD_NAME}")
+endif()
+
+set(CTEST_SOURCE_DIRECTORY ".")
+set(CTEST_BINARY_DIRECTORY "build")
+
+set(CTEST_CMAKE_GENERATOR "Unix Makefiles")
+
+set(CTEST_USE_LAUNCHERS 1)
+set(CTEST_MODEL "Continuous")
+
+ctest_read_custom_files(${CTEST_BINARY_DIRECTORY})
+
+ctest_start(${CTEST_MODEL} TRACK ${CTEST_MODEL})
+ctest_configure(BUILD ${CTEST_BINARY_DIRECTORY} OPTIONS -DINTEGRATION_TESTS=ON RETURN_VALUE ret_con)
+ctest_build(BUILD ${CTEST_BINARY_DIRECTORY} RETURN_VALUE ret_bld)
+
+if(ret_bld EQUAL 0)
+    ctest_test(BUILD ${CTEST_BINARY_DIRECTORY} RETURN_VALUE ret_tst)
+endif()
+
+ctest_submit(RETURN_VALUE ret_sub)
+
+if(NOT ret_con EQUAL 0)
+    message(FATAL_ERROR "CI failing on config")
+endif()
+
+if(NOT ret_bld EQUAL 0)
+    message(FATAL_ERROR "CI failing on build")
+endif()
+
+if(NOT ret_tst EQUAL 0)
+    message(FATAL_ERROR "CI failing on tests")
+endif()
+
+if(NOT ret_sub EQUAL 0)
+    message(WARNING "Unable to submit results to CDash")
+endif()
diff --git a/ext/snowcrash/CMakeLists.txt b/ext/snowcrash/CMakeLists.txt
index 3013c10f5..3598f1b9d 100644
--- a/ext/snowcrash/CMakeLists.txt
+++ b/ext/snowcrash/CMakeLists.txt
@@ -25,19 +25,10 @@ else()
 endif()
 
 add_library(snowcrash SHARED ${snowcrash_SOURCES})
-add_library(snowcrash-static STATIC ${snowcrash_SOURCES})
-add_library(snowcrash-pic STATIC ${snowcrash_SOURCES})
-set_property(TARGET snowcrash-pic PROPERTY POSITION_INDEPENDENT_CODE 1)
-
-if(UNIX)
-    set_target_properties(snowcrash-static PROPERTIES OUTPUT_NAME snowcrash)
-endif()
 
 find_package(markdown-parser 1.0 REQUIRED)
 
-target_link_libraries(snowcrash PUBLIC markdown-parser::markdown-parser-pic)
-target_link_libraries(snowcrash-static PUBLIC markdown-parser::markdown-parser-static)
-target_link_libraries(snowcrash-pic PUBLIC markdown-parser::markdown-parser-pic)
+target_link_libraries(snowcrash PUBLIC markdown-parser::markdown-parser)
 
 target_include_directories(snowcrash PUBLIC
     $<BUILD_INTERFACE:${snowcrash_BINARY_DIR}/src>
@@ -45,19 +36,7 @@ target_include_directories(snowcrash PUBLIC
     $<INSTALL_INTERFACE:src>
     )
 
-target_include_directories(snowcrash-static PUBLIC
-    $<BUILD_INTERFACE:${snowcrash_BINARY_DIR}/src>
-    $<BUILD_INTERFACE:${snowcrash_SOURCE_DIR}/src>
-    $<INSTALL_INTERFACE:src>
-    )
-
-target_include_directories(snowcrash-pic PUBLIC
-    $<BUILD_INTERFACE:${snowcrash_BINARY_DIR}/src>
-    $<BUILD_INTERFACE:${snowcrash_SOURCE_DIR}/src>
-    $<INSTALL_INTERFACE:src>
-    )
-
-install(TARGETS snowcrash snowcrash-static snowcrash-pic EXPORT snowcrash-targets
+install(TARGETS snowcrash EXPORT snowcrash-targets
     LIBRARY DESTINATION lib
     ARCHIVE DESTINATION lib
     RUNTIME DESTINATION bin
@@ -84,9 +63,6 @@ install(
     )
 
 add_library(snowcrash::snowcrash ALIAS snowcrash)
-add_library(snowcrash::snowcrash-static ALIAS snowcrash-static)
-add_library(snowcrash::snowcrash-pic ALIAS snowcrash-pic)
-
 
 if(BUILD_TESTING)
     include(snowcrash-tests.cmake)
diff --git a/ext/snowcrash/ext/markdown-parser/CMakeLists.txt b/ext/snowcrash/ext/markdown-parser/CMakeLists.txt
index 366ad1c43..9e43611ee 100644
--- a/ext/snowcrash/ext/markdown-parser/CMakeLists.txt
+++ b/ext/snowcrash/ext/markdown-parser/CMakeLists.txt
@@ -47,26 +47,16 @@ set(MARKDOWN_PARSER_COMPILE_FEATURES
     cxx_uniform_initialization
     cxx_unrestricted_unions
     cxx_user_literals
-    cxx_variable_templates
     cxx_variadic_macros
     cxx_variadic_templates
     cxx_template_template_parameters
     )
 
 add_library(markdown-parser SHARED ${MARKDOWN_PARSER_SOURCES})
-add_library(markdown-parser-static STATIC ${MARKDOWN_PARSER_SOURCES})
-add_library(markdown-parser-pic STATIC ${MARKDOWN_PARSER_SOURCES})
-set_property(TARGET markdown-parser-pic PROPERTY POSITION_INDEPENDENT_CODE 1)
-
-if(UNIX)
-    set_target_properties(markdown-parser-static PROPERTIES OUTPUT_NAME markdown-parser)
-endif()
 
 find_package(Sundown 1.0 REQUIRED)
 
 target_link_libraries(markdown-parser PUBLIC Apiary::sundown-pic)
-target_link_libraries(markdown-parser-static PUBLIC Apiary::sundown-static)
-target_link_libraries(markdown-parser-pic PUBLIC Apiary::sundown-pic)
 
 target_include_directories(markdown-parser PUBLIC
     $<BUILD_INTERFACE:${markdown-parser_BINARY_DIR}/src>
@@ -74,23 +64,9 @@ target_include_directories(markdown-parser PUBLIC
     $<INSTALL_INTERFACE:src>
     )
 
-target_include_directories(markdown-parser-static PUBLIC
-    $<BUILD_INTERFACE:${markdown-parser_BINARY_DIR}/src>
-    $<BUILD_INTERFACE:${markdown-parser_SOURCE_DIR}/src>
-    $<INSTALL_INTERFACE:src>
-    )
-
-target_include_directories(markdown-parser-pic PUBLIC
-    $<BUILD_INTERFACE:${markdown-parser_BINARY_DIR}/src>
-    $<BUILD_INTERFACE:${markdown-parser_SOURCE_DIR}/src>
-    $<INSTALL_INTERFACE:src>
-    )
-
 target_compile_features(markdown-parser PUBLIC ${MARKDOWN_PARSER_COMPILE_FEATURES})
-target_compile_features(markdown-parser-static PUBLIC ${MARKDOWN_PARSER_COMPILE_FEATURES})
-target_compile_features(markdown-parser-pic PUBLIC ${MARKDOWN_PARSER_COMPILE_FEATURES})
 
-install(TARGETS markdown-parser markdown-parser-static markdown-parser-pic EXPORT markdown-parser-targets
+install(TARGETS markdown-parser EXPORT markdown-parser-targets
     LIBRARY DESTINATION lib
     ARCHIVE DESTINATION lib
     RUNTIME DESTINATION bin
@@ -118,8 +94,6 @@ install(
     )
 
 add_library(markdown-parser::markdown-parser ALIAS markdown-parser)
-add_library(markdown-parser::markdown-parser-static ALIAS markdown-parser-static)
-add_library(markdown-parser::markdown-parser-pic ALIAS markdown-parser-pic)
 
 if(BUILD_TESTING)
     include(markdown-parser-tests.cmake)
diff --git a/ext/snowcrash/ext/markdown-parser/markdown-parser-tests.cmake b/ext/snowcrash/ext/markdown-parser/markdown-parser-tests.cmake
index d2874a1d3..430966222 100644
--- a/ext/snowcrash/ext/markdown-parser/markdown-parser-tests.cmake
+++ b/ext/snowcrash/ext/markdown-parser/markdown-parser-tests.cmake
@@ -13,6 +13,6 @@ add_test(MardownParserTest markdown-parser-test)
 target_link_libraries(markdown-parser-test
     PRIVATE
         Catch2::Catch2
-        markdown-parser::markdown-parser-static
+        markdown-parser::markdown-parser
     )
 
diff --git a/ext/snowcrash/snowcrash-tests.cmake b/ext/snowcrash/snowcrash-tests.cmake
index 4a89b55e1..c57b037b2 100644
--- a/ext/snowcrash/snowcrash-tests.cmake
+++ b/ext/snowcrash/snowcrash-tests.cmake
@@ -47,8 +47,8 @@ add_test(SnowcrashTest snowcrash-test)
 target_link_libraries(snowcrash-test
     PRIVATE
         Catch2::Catch2
-        snowcrash::snowcrash-static
-        markdown-parser::markdown-parser-static
+        snowcrash::snowcrash
+        markdown-parser::markdown-parser
     )
 
 target_link_libraries(snowcrash-test-performance
diff --git a/features/support/env.rb b/features/support/env.rb
index 00478cc99..a3525260b 100644
--- a/features/support/env.rb
+++ b/features/support/env.rb
@@ -1,7 +1,5 @@
 require 'aruba/cucumber'
 
 Before do
-  @dirs << "../../features/fixtures"
-  
-  ENV['PATH'] = "#{ENV['PWD']}/src#{File::PATH_SEPARATOR}#{ENV['PATH']}"  
+  @dirs << "features/fixtures"
 end
diff --git a/integration.cmake b/integration.cmake
index 2e2941a01..6c72a3e24 100644
--- a/integration.cmake
+++ b/integration.cmake
@@ -1,7 +1,6 @@
 cmake_minimum_required(VERSION 3.6 FATAL_ERROR)
 
-find_program(Bundler bundle)
+find_program(Cucumber cucumber)
+add_test(NAME DrafterIntegration COMMAND ${Cucumber} .)
+set_property(TEST DrafterIntegration PROPERTY ENVIRONMENT "PATH=$ENV{PATH};${Drafter_BUILD_DIR}")
 
-file(COPY ${CMAKE_CURRENT_LIST_DIR}/features DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
-add_custom_target(BundleInstall ALL COMMAND ${Bundler} install --path vendor/bundle)
-add_test(NAME DrafterIntegration COMMAND ${Bundler} exec cucumber)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 503d17d04..b15c88751 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -75,9 +75,6 @@ set(DRAFTER_COMPILE_FEATURES
 
 # libdrafter
 add_library(drafter SHARED ${DRAFTER_SOURCES})
-add_library(drafter-static STATIC ${DRAFTER_SOURCES})
-add_library(drafter-pic STATIC ${DRAFTER_SOURCES})
-set_property(TARGET drafter-pic PROPERTY POSITION_INDEPENDENT_CODE 1)
 
 set_target_properties(drafter PROPERTIES PUBLIC_HEADER "drafter.h")
 
@@ -89,21 +86,7 @@ find_package(MPark.Variant 1.4 REQUIRED)
 
 target_link_libraries(drafter
     PRIVATE
-        snowcrash::snowcrash-pic
-        Boost::container
-        mpark_variant
-    )
-
-target_link_libraries(drafter-pic
-    PRIVATE
-        snowcrash::snowcrash-pic
-        Boost::container
-        mpark_variant
-    )
-
-target_link_libraries(drafter-static
-    PRIVATE
-        snowcrash::snowcrash-static
+        snowcrash::snowcrash
         Boost::container
         mpark_variant
     )
@@ -114,28 +97,11 @@ target_include_directories(drafter PUBLIC
     $<INSTALL_INTERFACE:>
     )
 
-target_include_directories(drafter-static PUBLIC
-    $<BUILD_INTERFACE:${Drafter_BINARY_DIR}>
-    $<BUILD_INTERFACE:${Drafter_SOURCE_DIR}>
-    $<INSTALL_INTERFACE:>
-    )
-
-target_include_directories(drafter-pic PUBLIC
-    $<BUILD_INTERFACE:${Drafter_BINARY_DIR}>
-    $<BUILD_INTERFACE:${Drafter_SOURCE_DIR}>
-    $<INSTALL_INTERFACE:>
-    )
-
-
 target_compile_definitions(drafter PRIVATE BUILDING_DRAFTER=1)
-target_compile_definitions(drafter-static PRIVATE BUILDING_DRAFTER=1)
-target_compile_definitions(drafter-pic PRIVATE BUILDING_DRAFTER=1)
 
 target_compile_definitions(drafter PUBLIC DRAFTER_BUILD_SHARED=1)
 
 target_compile_features(drafter PUBLIC ${DRAFTER_COMPILE_FEATURES})
-target_compile_features(drafter-static PUBLIC ${DRAFTER_COMPILE_FEATURES})
-target_compile_features(drafter-pic PUBLIC ${DRAFTER_COMPILE_FEATURES})
 
 # drafter-cli
 add_executable(drafter-cli
@@ -146,18 +112,15 @@ add_executable(drafter-cli
 
 target_link_libraries(drafter-cli
     PRIVATE
-        snowcrash::snowcrash-static
-        drafter::drafter-static
+        snowcrash::snowcrash
+        drafter::drafter
         cmdline::cmdline
         mpark_variant
     )
 
 set_target_properties(drafter-cli PROPERTIES OUTPUT_NAME drafter)
-if(UNIX)
-        set_target_properties(drafter-static PROPERTIES OUTPUT_NAME drafter)
-endif()
 
-install(TARGETS drafter drafter-static drafter-pic drafter-cli EXPORT drafter-targets
+install(TARGETS drafter drafter-cli EXPORT drafter-targets
     LIBRARY DESTINATION lib
     ARCHIVE DESTINATION lib
     RUNTIME DESTINATION bin
@@ -186,6 +149,3 @@ install(
     )
 
 add_library(drafter::drafter ALIAS drafter)
-add_library(drafter::drafter-static ALIAS drafter-static)
-add_library(drafter::drafter-pic ALIAS drafter-pic)
-
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 202556855..795f1b2e2 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -53,8 +53,8 @@ target_link_libraries(drafter-test
     PRIVATE
         Catch2::Catch2
         dtl::dtl
-        drafter::drafter-static
-        snowcrash::snowcrash-static
+        drafter::drafter
+        snowcrash::snowcrash
         Boost::container
         mpark_variant
     )