diff --git a/docs/configuration.md b/docs/configuration.md
index 28397e25..2e5fc6f9 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -73,6 +73,7 @@ This can be useful on certain platforms that do not provide the standard iostrea
     CATCH_CONFIG_POSIX_SIGNALS              // Enable handling POSIX signals
     CATCH_CONFIG_WINDOWS_CRTDBG             // Enable leak checking using Windows's CRT Debug Heap
     CATCH_CONFIG_DISABLE_STRINGIFICATION    // Disable stringifying the original expression
+    CATCH_CONFIG_DISABLE                    // Disables assertions and test case registration
 
 Currently Catch enables `CATCH_CONFIG_WINDOWS_SEH` only when compiled with MSVC, because some versions of MinGW do not have the necessary Win32 API support.
 
@@ -97,6 +98,13 @@ _Note: If you define `CATCH_CONFIG_DISABLE_MATCHERS` in the same file as Catch's
 ## `CATCH_CONFIG_DISABLE_STRINGIFICATION`
 This toggle enables a workaround for VS 2017 bug. For details see [known limitations](limitations.md#Visual Studio 2017 -- raw string literal in assert fails to compile)
 
+## `CATCH_CONFIG_DISABLE`
+This toggle removes most of Catch from given file. This means that `TEST_CASE`s are not registered and assertions are turned into no-ops. Useful for keeping tests within implementation files (ie for functions with internal linkage), instead of in external files.
+
+This feature is considered experimental and might change at any point.
+
+_Inspired by Doctest's `DOCTEST_CONFIG_DISABLE`_
+
 # Windows header clutter
 
 On Windows Catch includes `windows.h`. To minimize global namespace clutter in the implementation file, it defines `NOMINMAX` and `WIN32_LEAN_AND_MEAN` before including it. You can control this behaviour via two macros:
diff --git a/docs/release-notes.md b/docs/release-notes.md
index 2c4765fe..d076c8b3 100644
--- a/docs/release-notes.md
+++ b/docs/release-notes.md
@@ -9,6 +9,10 @@
 * Removed `Catch::toString` support
   * The new stringification machinery uses `Catch::StringMaker` specializations first and `operator<<` overloads second.
 * Removed legacy `SCOPED_MSG` and `SCOPED_INFO` macros
+* Removed `INTERNAL_CATCH_REGISTER_REPORTER`
+  * `CATCH_REGISTER_REPORTER` should be used to register reporters
+* Removed legacy `[hide]` tag
+  * `[.]`, `[.foo]` and `[!hide]` are still supported
 * Output into debugger is now colourized
 * `*_THROWS_AS(expr, exception_type)` now unconditionally appends `const&` to the exception type.
 * `CATCH_CONFIG_FAST_COMPILE` now affects the `CHECK_` family of assertions as well as `REQUIRE_` family of assertions
@@ -29,6 +33,14 @@
 * Catch uses new CLI parsing library (Clara)
   * Users can now easily add new command line options to the final executable
   * This also leads to some changes in `Catch::Session` interface
+* All parts of matchers can be removed from a TU by defining `CATCH_CONFIG_DISABLE_MATCHERS`
+  * This can be used to somewhat speed up compilation times
+* An experimental implementation of `CATCH_CONFIG_DISABLE` has been added
+  * Speeds up compilation by removing away Catch tests
+    * Currently removes all assertions and prevents `TEST_CASE` registrations
+  * Useful for implementing tests in source files
+    * ie for functions in anonymous namespaces
+  * Inspired by Doctest's `DOCTEST_CONFIG_DISABLE`
 
 ## Fixes
 
diff --git a/include/catch.hpp b/include/catch.hpp
index c1099264..956c4b30 100644
--- a/include/catch.hpp
+++ b/include/catch.hpp
@@ -72,6 +72,7 @@
 #  undef CLARA_CONFIG_MAIN
 #endif
 
+#if !defined(CATCH_CONFIG_DISABLE)
 //////
 // If this config identifier is defined then all CATCH macros are prefixed with CATCH_
 #ifdef CATCH_CONFIG_PREFIX_ALL
@@ -196,6 +197,134 @@
 
 using Catch::Detail::Approx;
 
+#else
+//////
+// If this config identifier is defined then all CATCH macros are prefixed with CATCH_
+#ifdef CATCH_CONFIG_PREFIX_ALL
+
+#define CATCH_REQUIRE( ... )        (void)(0)
+#define CATCH_REQUIRE_FALSE( ... )  (void)(0)
+
+#define CATCH_REQUIRE_THROWS( ... ) (void)(0)
+#define CATCH_REQUIRE_THROWS_AS( expr, exceptionType ) (void)(0)
+#define CATCH_REQUIRE_THROWS_WITH( expr, matcher )     (void)(0)
+#if !defined(CATCH_CONFIG_DISABLE_MATCHERS)
+#define CATCH_REQUIRE_THROWS_MATCHES( expr, exceptionType, matcher ) (void)(0)
+#endif// CATCH_CONFIG_DISABLE_MATCHERS
+#define CATCH_REQUIRE_NOTHROW( ... ) (void)(0)
+
+#define CATCH_CHECK( ... )         (void)(0)
+#define CATCH_CHECK_FALSE( ... )   (void)(0)
+#define CATCH_CHECKED_IF( ... )    if (__VA_ARGS__)
+#define CATCH_CHECKED_ELSE( ... )  if (!(__VA_ARGS__))
+#define CATCH_CHECK_NOFAIL( ... )  (void)(0)
+
+#define CATCH_CHECK_THROWS( ... )  (void)(0)
+#define CATCH_CHECK_THROWS_AS( expr, exceptionType ) (void)(0)
+#define CATCH_CHECK_THROWS_WITH( expr, matcher )     (void)(0)
+#if !defined(CATCH_CONFIG_DISABLE_MATCHERS)
+#define CATCH_CHECK_THROWS_MATCHES( expr, exceptionType, matcher ) (void)(0)
+#endif // CATCH_CONFIG_DISABLE_MATCHERS
+#define CATCH_CHECK_NOTHROW( ... ) (void)(0)
+
+#if !defined(CATCH_CONFIG_DISABLE_MATCHERS)
+#define CATCH_CHECK_THAT( arg, matcher )   (void)(0)
+
+#define CATCH_REQUIRE_THAT( arg, matcher ) (void)(0)
+#endif // CATCH_CONFIG_DISABLE_MATCHERS
+
+#define CATCH_INFO( msg )    (void)(0)
+#define CATCH_WARN( msg )    (void)(0)
+#define CATCH_CAPTURE( msg ) (void)(0)
+
+#define CATCH_TEST_CASE( ... ) INTERNAL_CATCH_TESTCASE_NO_REGISTRATION(INTERNAL_CATCH_UNIQUE_NAME( ____C_A_T_C_H____T_E_S_T____ ))
+#define CATCH_TEST_CASE_METHOD( className, ... ) INTERNAL_CATCH_TESTCASE_NO_REGISTRATION(INTERNAL_CATCH_UNIQUE_NAME( ____C_A_T_C_H____T_E_S_T____ ))
+#define CATCH_METHOD_AS_TEST_CASE( method, ... )
+#define CATCH_REGISTER_TEST_CASE( Function, ... ) (void)(0)
+#define CATCH_SECTION( ... )
+#define CATCH_FAIL( ... ) (void)(0)
+#define CATCH_FAIL_CHECK( ... ) (void)(0)
+#define CATCH_SUCCEED( ... ) (void)(0)
+
+#define CATCH_ANON_TEST_CASE() INTERNAL_CATCH_TESTCASE_NO_REGISTRATION(INTERNAL_CATCH_UNIQUE_NAME( ____C_A_T_C_H____T_E_S_T____ ))
+
+// "BDD-style" convenience wrappers
+#define CATCH_SCENARIO( ... ) INTERNAL_CATCH_TESTCASE_NO_REGISTRATION(INTERNAL_CATCH_UNIQUE_NAME( ____C_A_T_C_H____T_E_S_T____ ))
+#define CATCH_SCENARIO_METHOD( className, ... ) INTERNAL_CATCH_TESTCASE_METHOD_NO_REGISTRATION(INTERNAL_CATCH_UNIQUE_NAME( ____C_A_T_C_H____T_E_S_T____ ), className )
+#define CATCH_GIVEN( desc )
+#define CATCH_WHEN( desc )
+#define CATCH_AND_WHEN( desc )
+#define CATCH_THEN( desc )
+#define CATCH_AND_THEN( desc )
+
+// If CATCH_CONFIG_PREFIX_ALL is not defined then the CATCH_ prefix is not required
+#else
+
+#define REQUIRE( ... )       (void)(0)
+#define REQUIRE_FALSE( ... ) (void)(0)
+
+#define REQUIRE_THROWS( ... ) (void)(0)
+#define REQUIRE_THROWS_AS( expr, exceptionType ) (void)(0)
+#define REQUIRE_THROWS_WITH( expr, matcher ) (void)(0)
+#if !defined(CATCH_CONFIG_DISABLE_MATCHERS)
+#define REQUIRE_THROWS_MATCHES( expr, exceptionType, matcher ) (void)(0)
+#endif // CATCH_CONFIG_DISABLE_MATCHERS
+#define REQUIRE_NOTHROW( ... ) (void)(0)
+
+#define CHECK( ... ) (void)(0)
+#define CHECK_FALSE( ... ) (void)(0)
+#define CHECKED_IF( ... ) if (__VA_ARGS__)
+#define CHECKED_ELSE( ... ) if (!(__VA_ARGS__))
+#define CHECK_NOFAIL( ... ) (void)(0)
+
+#define CHECK_THROWS( ... )  (void)(0)
+#define CHECK_THROWS_AS( expr, exceptionType ) (void)(0)
+#define CHECK_THROWS_WITH( expr, matcher ) (void)(0)
+#if !defined(CATCH_CONFIG_DISABLE_MATCHERS)
+#define CHECK_THROWS_MATCHES( expr, exceptionType, matcher ) (void)(0)
+#endif // CATCH_CONFIG_DISABLE_MATCHERS
+#define CHECK_NOTHROW( ... ) (void)(0)
+
+
+#if !defined(CATCH_CONFIG_DISABLE_MATCHERS)
+#define CHECK_THAT( arg, matcher ) (void)(0)
+
+#define REQUIRE_THAT( arg, matcher ) (void)(0)
+#endif // CATCH_CONFIG_DISABLE_MATCHERS
+
+#define INFO( msg ) (void)(0)
+#define WARN( msg ) (void)(0)
+#define CAPTURE( msg ) (void)(0)
+
+#define TEST_CASE( ... )  INTERNAL_CATCH_TESTCASE_NO_REGISTRATION(INTERNAL_CATCH_UNIQUE_NAME( ____C_A_T_C_H____T_E_S_T____ ))
+#define TEST_CASE_METHOD( className, ... ) INTERNAL_CATCH_TESTCASE_NO_REGISTRATION(INTERNAL_CATCH_UNIQUE_NAME( ____C_A_T_C_H____T_E_S_T____ ))
+#define METHOD_AS_TEST_CASE( method, ... )
+#define REGISTER_TEST_CASE( Function, ... ) (void)(0)
+#define SECTION( ... )
+#define FAIL( ... ) (void)(0)
+#define FAIL_CHECK( ... ) (void)(0)
+#define SUCCEED( ... ) (void)(0)
+#define ANON_TEST_CASE() INTERNAL_CATCH_TESTCASE_NO_REGISTRATION(INTERNAL_CATCH_UNIQUE_NAME( ____C_A_T_C_H____T_E_S_T____ ))
+
+#endif
+
+#define CATCH_TRANSLATE_EXCEPTION( signature ) INTERNAL_CATCH_TRANSLATE_EXCEPTION( signature )
+
+// "BDD-style" convenience wrappers
+#define SCENARIO( ... ) INTERNAL_CATCH_TESTCASE_NO_REGISTRATION(INTERNAL_CATCH_UNIQUE_NAME( ____C_A_T_C_H____T_E_S_T____ ) )
+#define SCENARIO_METHOD( className, ... ) INTERNAL_CATCH_TESTCASE_METHOD_NO_REGISTRATION(INTERNAL_CATCH_UNIQUE_NAME( ____C_A_T_C_H____T_E_S_T____ ), className )
+
+#define GIVEN( desc )
+#define WHEN( desc )
+#define AND_WHEN( desc )
+#define THEN( desc )
+#define AND_THEN( desc )
+
+using Catch::Detail::Approx;
+
+
+#endif
+
 #include "internal/catch_reenable_warnings.h"
 
 #endif // TWOBLUECUBES_CATCH_HPP_INCLUDED
diff --git a/include/internal/catch_capture.hpp b/include/internal/catch_capture.hpp
index bfa18bfd..c914bffe 100644
--- a/include/internal/catch_capture.hpp
+++ b/include/internal/catch_capture.hpp
@@ -12,6 +12,8 @@
 #include "catch_message.h"
 #include "catch_interfaces_capture.h"
 
+#if !defined(CATCH_CONFIG_DISABLE)
+
 #if !defined(CATCH_CONFIG_DISABLE_STRINGIFICATION)
   #define CATCH_INTERNAL_STRINGIFY(...) #__VA_ARGS__
 #else
@@ -157,5 +159,6 @@
         INTERNAL_CATCH_REACT( catchAssertionHandler ) \
     } while( Catch::alwaysFalse() )
 
+#endif // CATCH_CONFIG_DISABLE
 
 #endif // TWOBLUECUBES_CATCH_CAPTURE_HPP_INCLUDED
diff --git a/include/internal/catch_test_registry.hpp b/include/internal/catch_test_registry.hpp
index 07334c34..374da734 100644
--- a/include/internal/catch_test_registry.hpp
+++ b/include/internal/catch_test_registry.hpp
@@ -47,6 +47,19 @@ struct AutoReg : NonCopyable {
 
 } // end namespace Catch
 
+#if defined(CATCH_CONFIG_DISABLE)
+    #define INTERNAL_CATCH_TESTCASE_NO_REGISTRATION( TestName, ... ) \
+        static void TestName()
+    #define INTERNAL_CATCH_TESTCASE_METHOD_NO_REGISTRATION( TestName, ClassName, ... ) \
+        namespace{                        \
+            struct TestName : ClassName { \
+                void test();              \
+            };                            \
+        }                                 \
+        void TestName::test()
+
+#endif
+
     ///////////////////////////////////////////////////////////////////////////////
     #define INTERNAL_CATCH_TESTCASE2( TestName, ... ) \
         static void TestName(); \