5 files changed, 8 insertions, 12 deletions
diff --git a/libphobos/libdruntime/MERGE b/libphobos/libdruntime/MERGE
index 18c9d11..00c8518 100644
--- a/libphobos/libdruntime/MERGE
+++ b/libphobos/libdruntime/MERGE
@@ -1,4 +1,4 @@
-d2ee11364c25ca8865eb0acb9596a6147532ef41
+c6863be7206eef3c393726363a480baf0a0c6530
 
 The first line of this file holds the git revision number of the last
 merge done from the dlang/dmd repository.
diff --git a/libphobos/libdruntime/Makefile.am b/libphobos/libdruntime/Makefile.am
index 595e3f9..252c6a3 100644
--- a/libphobos/libdruntime/Makefile.am
+++ b/libphobos/libdruntime/Makefile.am
@@ -222,7 +222,7 @@ DRUNTIME_DSOURCES = core/atomic.d core/attribute.d core/bitop.d \
 	gcc/unwind/generic.d gcc/unwind/package.d gcc/unwind/pe.d object.d \
 	rt/aApply.d rt/aApplyR.d rt/aaA.d rt/adi.d rt/arraycat.d rt/cast_.d \
 	rt/config.d rt/critical_.d rt/deh.d rt/dmain2.d rt/ehalloc.d \
-	rt/invariant.d rt/lifetime.d rt/memory.d rt/minfo.d rt/monitor_.d \
+	rt/invariant_.d rt/lifetime.d rt/memory.d rt/minfo.d rt/monitor_.d \
 	rt/profilegc.d rt/sections.d rt/tlsgc.d rt/util/typeinfo.d \
 	rt/util/utility.d
 
diff --git a/libphobos/libdruntime/Makefile.in b/libphobos/libdruntime/Makefile.in
index 4832fd1..52b0c37 100644
--- a/libphobos/libdruntime/Makefile.in
+++ b/libphobos/libdruntime/Makefile.in
@@ -248,7 +248,7 @@ am__objects_1 = core/atomic.lo core/attribute.lo core/bitop.lo \
 	gcc/unwind/generic.lo gcc/unwind/package.lo gcc/unwind/pe.lo \
 	object.lo rt/aApply.lo rt/aApplyR.lo rt/aaA.lo rt/adi.lo \
 	rt/arraycat.lo rt/cast_.lo rt/config.lo rt/critical_.lo \
-	rt/deh.lo rt/dmain2.lo rt/ehalloc.lo rt/invariant.lo \
+	rt/deh.lo rt/dmain2.lo rt/ehalloc.lo rt/invariant_.lo \
 	rt/lifetime.lo rt/memory.lo rt/minfo.lo rt/monitor_.lo \
 	rt/profilegc.lo rt/sections.lo rt/tlsgc.lo rt/util/typeinfo.lo \
 	rt/util/utility.lo
@@ -903,7 +903,7 @@ DRUNTIME_DSOURCES = core/atomic.d core/attribute.d core/bitop.d \
 	gcc/unwind/generic.d gcc/unwind/package.d gcc/unwind/pe.d object.d \
 	rt/aApply.d rt/aApplyR.d rt/aaA.d rt/adi.d rt/arraycat.d rt/cast_.d \
 	rt/config.d rt/critical_.d rt/deh.d rt/dmain2.d rt/ehalloc.d \
-	rt/invariant.d rt/lifetime.d rt/memory.d rt/minfo.d rt/monitor_.d \
+	rt/invariant_.d rt/lifetime.d rt/memory.d rt/minfo.d rt/monitor_.d \
 	rt/profilegc.d rt/sections.d rt/tlsgc.d rt/util/typeinfo.d \
 	rt/util/utility.d
 
@@ -1413,7 +1413,7 @@ rt/critical_.lo: rt/$(am__dirstamp)
 rt/deh.lo: rt/$(am__dirstamp)
 rt/dmain2.lo: rt/$(am__dirstamp)
 rt/ehalloc.lo: rt/$(am__dirstamp)
-rt/invariant.lo: rt/$(am__dirstamp)
+rt/invariant_.lo: rt/$(am__dirstamp)
 rt/lifetime.lo: rt/$(am__dirstamp)
 rt/memory.lo: rt/$(am__dirstamp)
 rt/minfo.lo: rt/$(am__dirstamp)
diff --git a/libphobos/libdruntime/core/stdcpp/xutility.d b/libphobos/libdruntime/core/stdcpp/xutility.d
index 5e2e711..f93df68 100644
--- a/libphobos/libdruntime/core/stdcpp/xutility.d
+++ b/libphobos/libdruntime/core/stdcpp/xutility.d
@@ -35,6 +35,7 @@ enum CppStdRevision : uint
     cpp14 = 201402,
     cpp17 = 201703,
     cpp20 = 202002,
+    cpp23 = 202302,
 }
 
 /**
diff --git a/libphobos/libdruntime/rt/invariant.d b/libphobos/libdruntime/rt/invariant_.d
index e536196..2a64dc8 100644
--- a/libphobos/libdruntime/rt/invariant.d
+++ b/libphobos/libdruntime/rt/invariant_.d
@@ -4,15 +4,10 @@
  * Copyright: Copyright Digital Mars 2007 - 2010.
  * License:   $(HTTP www.boost.org/LICENSE_1_0.txt, Boost License 1.0).
  * Authors:   Walter Bright
- * Source: $(DRUNTIMESRC rt/_invariant.d)
- */
-
-/*          Copyright Digital Mars 2007 - 2010.
- * Distributed under the Boost Software License, Version 1.0.
- *    (See accompanying file LICENSE or copy at
- *          http://www.boost.org/LICENSE_1_0.txt)
+ * Source: $(DRUNTIMESRC rt/_invariant_.d)
  */
 
+module rt.invariant_;
 
 /**
  *