diff --git a/regression-tests/test-results/gcc-10/mixed-allcpp1-hello.cpp.output b/regression-tests/test-results/clang-12/pure2-bugfix-for-requires-clause-unbraced-function-initializer.cpp.execution
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diff --git a/regression-tests/test-results/gcc-10/mixed-as-for-variant-20-types.cpp.output b/regression-tests/test-results/clang-12/pure2-bugfix-for-requires-clause-unbraced-function-initializer.cpp.output
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diff --git a/regression-tests/test-results/gcc-10/gcc-version.output b/regression-tests/test-results/gcc-10/gcc-version.output
deleted file mode 100644
index b71d86e8cf..0000000000
--- a/regression-tests/test-results/gcc-10/gcc-version.output
+++ /dev/null
@@ -1,5 +0,0 @@
-g++-10 (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0
-Copyright (C) 2020 Free Software Foundation, Inc.
-This is free software; see the source for copying conditions.  There is NO
-warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-
diff --git a/regression-tests/test-results/gcc-10/xyzzy b/regression-tests/test-results/gcc-10/xyzzy
deleted file mode 100644
index 805bcb8538..0000000000
--- a/regression-tests/test-results/gcc-10/xyzzy
+++ /dev/null
@@ -1 +0,0 @@
-Hello Fred with UFCS!
\ No newline at end of file
diff --git a/regression-tests/test-results/gcc-13/gcc-version.output b/regression-tests/test-results/gcc-13/gcc-version.output
index 7bbac4c854..c6847fe85f 100644
--- a/regression-tests/test-results/gcc-13/gcc-version.output
+++ b/regression-tests/test-results/gcc-13/gcc-version.output
@@ -1,4 +1,4 @@
-c++ (GCC) 13.1.1 20230429
+gcc (GCC) 13.1.1 20230614 (Red Hat 13.1.1-4)
 Copyright (C) 2023 Free Software Foundation, Inc.
 This is free software; see the source for copying conditions.  There is NO
 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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diff --git a/regression-tests/test-results/gcc-10/pure2-statement-scope-parameters.cpp.execution b/regression-tests/test-results/gcc-13/pure2-statement-scope-parameters.cpp.execution
similarity index 100%
rename from regression-tests/test-results/gcc-10/pure2-statement-scope-parameters.cpp.execution
rename to regression-tests/test-results/gcc-13/pure2-statement-scope-parameters.cpp.execution
diff --git a/regression-tests/test-results/gcc-10/pure2-statement-scope-parameters.cpp.output b/regression-tests/test-results/gcc-13/pure2-statement-scope-parameters.cpp.output
similarity index 100%
rename from regression-tests/test-results/gcc-10/pure2-statement-scope-parameters.cpp.output
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diff --git a/regression-tests/test-results/gcc-10/pure2-stdio-with-raii.cpp.execution b/regression-tests/test-results/gcc-13/pure2-stdio-with-raii.cpp.execution
similarity index 100%
rename from regression-tests/test-results/gcc-10/pure2-stdio-with-raii.cpp.execution
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diff --git a/regression-tests/test-results/gcc-10/pure2-stdio-with-raii.cpp.output b/regression-tests/test-results/gcc-13/pure2-stdio-with-raii.cpp.output
similarity index 100%
rename from regression-tests/test-results/gcc-10/pure2-stdio-with-raii.cpp.output
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diff --git a/regression-tests/test-results/gcc-10/pure2-stdio.cpp.execution b/regression-tests/test-results/gcc-13/pure2-stdio.cpp.execution
similarity index 100%
rename from regression-tests/test-results/gcc-10/pure2-stdio.cpp.execution
rename to regression-tests/test-results/gcc-13/pure2-stdio.cpp.execution
diff --git a/regression-tests/test-results/gcc-10/pure2-stdio.cpp.output b/regression-tests/test-results/gcc-13/pure2-stdio.cpp.output
similarity index 100%
rename from regression-tests/test-results/gcc-10/pure2-stdio.cpp.output
rename to regression-tests/test-results/gcc-13/pure2-stdio.cpp.output
diff --git a/regression-tests/test-results/gcc-10/pure2-synthesize-rightshift-and-rightshifteq.cpp.execution b/regression-tests/test-results/gcc-13/pure2-synthesize-rightshift-and-rightshifteq.cpp.execution
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rename from regression-tests/test-results/gcc-10/pure2-synthesize-rightshift-and-rightshifteq.cpp.execution
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diff --git a/regression-tests/test-results/gcc-10/pure2-synthesize-rightshift-and-rightshifteq.cpp.output b/regression-tests/test-results/gcc-13/pure2-synthesize-rightshift-and-rightshifteq.cpp.output
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rename from regression-tests/test-results/gcc-10/pure2-synthesize-rightshift-and-rightshifteq.cpp.output
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diff --git a/regression-tests/test-results/gcc-10/pure2-template-parameter-lists.cpp.execution b/regression-tests/test-results/gcc-13/pure2-template-parameter-lists.cpp.execution
similarity index 100%
rename from regression-tests/test-results/gcc-10/pure2-template-parameter-lists.cpp.execution
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diff --git a/regression-tests/test-results/gcc-10/pure2-template-parameter-lists.cpp.output b/regression-tests/test-results/gcc-13/pure2-template-parameter-lists.cpp.output
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diff --git a/regression-tests/test-results/gcc-10/pure2-type-and-namespace-aliases.cpp.execution b/regression-tests/test-results/gcc-13/pure2-type-and-namespace-aliases.cpp.execution
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diff --git a/regression-tests/test-results/gcc-10/pure2-type-and-namespace-aliases.cpp.output b/regression-tests/test-results/gcc-13/pure2-type-and-namespace-aliases.cpp.output
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diff --git a/regression-tests/test-results/gcc-10/pure2-type-safety-1.cpp.execution b/regression-tests/test-results/gcc-13/pure2-type-safety-1.cpp.execution
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diff --git a/regression-tests/test-results/gcc-10/pure2-type-safety-1.cpp.output b/regression-tests/test-results/gcc-13/pure2-type-safety-1.cpp.output
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diff --git a/regression-tests/test-results/gcc-10/pure2-type-safety-2-with-inspect-expression.cpp.execution b/regression-tests/test-results/gcc-13/pure2-type-safety-2-with-inspect-expression.cpp.execution
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diff --git a/regression-tests/test-results/gcc-10/pure2-type-safety-2-with-inspect-expression.cpp.output b/regression-tests/test-results/gcc-13/pure2-type-safety-2-with-inspect-expression.cpp.output
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diff --git a/regression-tests/test-results/gcc-10/pure2-types-basics.cpp.execution b/regression-tests/test-results/gcc-13/pure2-types-basics.cpp.execution
similarity index 100%
rename from regression-tests/test-results/gcc-10/pure2-types-basics.cpp.execution
rename to regression-tests/test-results/gcc-13/pure2-types-basics.cpp.execution
diff --git a/regression-tests/test-results/gcc-10/pure2-types-basics.cpp.output b/regression-tests/test-results/gcc-13/pure2-types-basics.cpp.output
similarity index 100%
rename from regression-tests/test-results/gcc-10/pure2-types-basics.cpp.output
rename to regression-tests/test-results/gcc-13/pure2-types-basics.cpp.output
diff --git a/regression-tests/test-results/gcc-10/pure2-types-inheritance.cpp.execution b/regression-tests/test-results/gcc-13/pure2-types-inheritance.cpp.execution
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rename from regression-tests/test-results/gcc-10/pure2-types-inheritance.cpp.execution
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diff --git a/regression-tests/test-results/gcc-10/pure2-types-inheritance.cpp.output b/regression-tests/test-results/gcc-13/pure2-types-inheritance.cpp.output
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rename from regression-tests/test-results/gcc-10/pure2-types-inheritance.cpp.output
rename to regression-tests/test-results/gcc-13/pure2-types-inheritance.cpp.output
diff --git a/regression-tests/test-results/gcc-10/pure2-types-order-independence-and-nesting.cpp.execution b/regression-tests/test-results/gcc-13/pure2-types-order-independence-and-nesting.cpp.execution
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rename from regression-tests/test-results/gcc-10/pure2-types-order-independence-and-nesting.cpp.execution
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diff --git a/regression-tests/test-results/gcc-10/pure2-types-order-independence-and-nesting.cpp.output b/regression-tests/test-results/gcc-13/pure2-types-order-independence-and-nesting.cpp.output
similarity index 100%
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diff --git a/regression-tests/test-results/gcc-10/pure2-types-ordering-via-meta-functions.cpp.execution b/regression-tests/test-results/gcc-13/pure2-types-ordering-via-meta-functions.cpp.execution
similarity index 100%
rename from regression-tests/test-results/gcc-10/pure2-types-ordering-via-meta-functions.cpp.execution
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diff --git a/regression-tests/test-results/gcc-10/pure2-types-ordering-via-meta-functions.cpp.output b/regression-tests/test-results/gcc-13/pure2-types-ordering-via-meta-functions.cpp.output
similarity index 100%
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diff --git a/regression-tests/test-results/gcc-10/pure2-types-smf-and-that-1-provide-everything.cpp.execution b/regression-tests/test-results/gcc-13/pure2-types-smf-and-that-1-provide-everything.cpp.execution
similarity index 100%
rename from regression-tests/test-results/gcc-10/pure2-types-smf-and-that-1-provide-everything.cpp.execution
rename to regression-tests/test-results/gcc-13/pure2-types-smf-and-that-1-provide-everything.cpp.execution
diff --git a/regression-tests/test-results/gcc-10/pure2-types-smf-and-that-1-provide-everything.cpp.output b/regression-tests/test-results/gcc-13/pure2-types-smf-and-that-1-provide-everything.cpp.output
similarity index 100%
rename from regression-tests/test-results/gcc-10/pure2-types-smf-and-that-1-provide-everything.cpp.output
rename to regression-tests/test-results/gcc-13/pure2-types-smf-and-that-1-provide-everything.cpp.output
diff --git a/regression-tests/test-results/gcc-10/pure2-types-smf-and-that-2-provide-mvconstruct-and-cpassign.cpp.execution b/regression-tests/test-results/gcc-13/pure2-types-smf-and-that-2-provide-mvconstruct-and-cpassign.cpp.execution
similarity index 100%
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diff --git a/regression-tests/test-results/gcc-10/pure2-types-smf-and-that-2-provide-mvconstruct-and-cpassign.cpp.output b/regression-tests/test-results/gcc-13/pure2-types-smf-and-that-2-provide-mvconstruct-and-cpassign.cpp.output
similarity index 100%
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diff --git a/regression-tests/test-results/gcc-10/pure2-types-smf-and-that-3-provide-mvconstruct-and-mvassign.cpp.execution b/regression-tests/test-results/gcc-13/pure2-types-smf-and-that-3-provide-mvconstruct-and-mvassign.cpp.execution
similarity index 100%
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rename to regression-tests/test-results/gcc-13/pure2-types-smf-and-that-3-provide-mvconstruct-and-mvassign.cpp.execution
diff --git a/regression-tests/test-results/gcc-10/pure2-types-smf-and-that-3-provide-mvconstruct-and-mvassign.cpp.output b/regression-tests/test-results/gcc-13/pure2-types-smf-and-that-3-provide-mvconstruct-and-mvassign.cpp.output
similarity index 100%
rename from regression-tests/test-results/gcc-10/pure2-types-smf-and-that-3-provide-mvconstruct-and-mvassign.cpp.output
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diff --git a/regression-tests/test-results/gcc-10/pure2-types-smf-and-that-4-provide-cpassign-and-mvassign.cpp.execution b/regression-tests/test-results/gcc-13/pure2-types-smf-and-that-4-provide-cpassign-and-mvassign.cpp.execution
similarity index 100%
rename from regression-tests/test-results/gcc-10/pure2-types-smf-and-that-4-provide-cpassign-and-mvassign.cpp.execution
rename to regression-tests/test-results/gcc-13/pure2-types-smf-and-that-4-provide-cpassign-and-mvassign.cpp.execution
diff --git a/regression-tests/test-results/gcc-10/pure2-types-smf-and-that-4-provide-cpassign-and-mvassign.cpp.output b/regression-tests/test-results/gcc-13/pure2-types-smf-and-that-4-provide-cpassign-and-mvassign.cpp.output
similarity index 100%
rename from regression-tests/test-results/gcc-10/pure2-types-smf-and-that-4-provide-cpassign-and-mvassign.cpp.output
rename to regression-tests/test-results/gcc-13/pure2-types-smf-and-that-4-provide-cpassign-and-mvassign.cpp.output
diff --git a/regression-tests/test-results/gcc-10/pure2-types-smf-and-that-5-provide-nothing-but-general-case.cpp.execution b/regression-tests/test-results/gcc-13/pure2-types-smf-and-that-5-provide-nothing-but-general-case.cpp.execution
similarity index 100%
rename from regression-tests/test-results/gcc-10/pure2-types-smf-and-that-5-provide-nothing-but-general-case.cpp.execution
rename to regression-tests/test-results/gcc-13/pure2-types-smf-and-that-5-provide-nothing-but-general-case.cpp.execution
diff --git a/regression-tests/test-results/gcc-10/pure2-types-smf-and-that-5-provide-nothing-but-general-case.cpp.output b/regression-tests/test-results/gcc-13/pure2-types-smf-and-that-5-provide-nothing-but-general-case.cpp.output
similarity index 100%
rename from regression-tests/test-results/gcc-10/pure2-types-smf-and-that-5-provide-nothing-but-general-case.cpp.output
rename to regression-tests/test-results/gcc-13/pure2-types-smf-and-that-5-provide-nothing-but-general-case.cpp.output
diff --git a/regression-tests/test-results/gcc-10/pure2-types-that-parameters.cpp.execution b/regression-tests/test-results/gcc-13/pure2-types-that-parameters.cpp.execution
similarity index 100%
rename from regression-tests/test-results/gcc-10/pure2-types-that-parameters.cpp.execution
rename to regression-tests/test-results/gcc-13/pure2-types-that-parameters.cpp.execution
diff --git a/regression-tests/test-results/gcc-10/pure2-types-that-parameters.cpp.output b/regression-tests/test-results/gcc-13/pure2-types-that-parameters.cpp.output
similarity index 100%
rename from regression-tests/test-results/gcc-10/pure2-types-that-parameters.cpp.output
rename to regression-tests/test-results/gcc-13/pure2-types-that-parameters.cpp.output
diff --git a/regression-tests/test-results/gcc-10/pure2-types-value-types-via-meta-functions.cpp.execution b/regression-tests/test-results/gcc-13/pure2-types-value-types-via-meta-functions.cpp.execution
similarity index 100%
rename from regression-tests/test-results/gcc-10/pure2-types-value-types-via-meta-functions.cpp.execution
rename to regression-tests/test-results/gcc-13/pure2-types-value-types-via-meta-functions.cpp.execution
diff --git a/regression-tests/test-results/gcc-10/pure2-types-value-types-via-meta-functions.cpp.output b/regression-tests/test-results/gcc-13/pure2-types-value-types-via-meta-functions.cpp.output
similarity index 100%
rename from regression-tests/test-results/gcc-10/pure2-types-value-types-via-meta-functions.cpp.output
rename to regression-tests/test-results/gcc-13/pure2-types-value-types-via-meta-functions.cpp.output
diff --git a/regression-tests/test-results/gcc-10/pure2-ufcs-member-access-and-chaining.cpp.execution b/regression-tests/test-results/gcc-13/pure2-ufcs-member-access-and-chaining.cpp.execution
similarity index 100%
rename from regression-tests/test-results/gcc-10/pure2-ufcs-member-access-and-chaining.cpp.execution
rename to regression-tests/test-results/gcc-13/pure2-ufcs-member-access-and-chaining.cpp.execution
diff --git a/regression-tests/test-results/gcc-10/pure2-ufcs-member-access-and-chaining.cpp.output b/regression-tests/test-results/gcc-13/pure2-ufcs-member-access-and-chaining.cpp.output
similarity index 100%
rename from regression-tests/test-results/gcc-10/pure2-ufcs-member-access-and-chaining.cpp.output
rename to regression-tests/test-results/gcc-13/pure2-ufcs-member-access-and-chaining.cpp.output
diff --git a/regression-tests/test-results/gcc-10/pure2-various-string-literals.cpp.execution b/regression-tests/test-results/gcc-13/pure2-various-string-literals.cpp.execution
similarity index 100%
rename from regression-tests/test-results/gcc-10/pure2-various-string-literals.cpp.execution
rename to regression-tests/test-results/gcc-13/pure2-various-string-literals.cpp.execution
diff --git a/regression-tests/test-results/gcc-10/pure2-various-string-literals.cpp.output b/regression-tests/test-results/gcc-13/pure2-various-string-literals.cpp.output
similarity index 100%
rename from regression-tests/test-results/gcc-10/pure2-various-string-literals.cpp.output
rename to regression-tests/test-results/gcc-13/pure2-various-string-literals.cpp.output
diff --git a/regression-tests/test-results/gcc-10/run-tests-gcc-10.sh b/regression-tests/test-results/gcc-13/run-tests-gcc-13.sh
similarity index 63%
rename from regression-tests/test-results/gcc-10/run-tests-gcc-10.sh
rename to regression-tests/test-results/gcc-13/run-tests-gcc-13.sh
index ea917ece97..f053e03fcc 100644
--- a/regression-tests/test-results/gcc-10/run-tests-gcc-10.sh
+++ b/regression-tests/test-results/gcc-13/run-tests-gcc-13.sh
@@ -1,15 +1,15 @@
-# This is intended to be run in the /test-results/gcc-10 subdirectory
-# in a Linux shell with g++-10 installed
+# This is intended to be run in the /test-results/gcc-13 subdirectory
+# in a Linux shell with gcc 13 installed
 #
 cp ../*.cpp .
 rm -f *.output
 count=0
 exe_count=0
-g++-10 --version > gcc-version.output 2>&1
+gcc --version > gcc-version.output 2>&1
 for f in *.cpp
 do
-    printf "Starting g++-10 %s\n" "$f"
-    g++-10 -I../../../include -std=c++20 -pthread -o test.exe $f > $f.output 2>&1
+    printf "Starting gcc 13 %s\n" "$f"
+    g++ -I../../../include -std=c++20 -pthread -o test.exe $f > $f.output 2>&1
     rm -f $f
     let count=count+1
     if test -f "test.exe"; then
diff --git a/regression-tests/test-results/gcc-13/xyzzy b/regression-tests/test-results/gcc-13/xyzzy
new file mode 100644
index 0000000000..68d214b54b
--- /dev/null
+++ b/regression-tests/test-results/gcc-13/xyzzy
@@ -0,0 +1 @@
+Hello Freddy with UFCS!
\ No newline at end of file
diff --git a/regression-tests/test-results/msvc-2022/pure2-bugfix-for-requires-clause-unbraced-function-initializer.cpp.execution b/regression-tests/test-results/msvc-2022/pure2-bugfix-for-requires-clause-unbraced-function-initializer.cpp.execution
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/regression-tests/test-results/msvc-2022/pure2-bugfix-for-requires-clause-unbraced-function-initializer.cpp.output b/regression-tests/test-results/msvc-2022/pure2-bugfix-for-requires-clause-unbraced-function-initializer.cpp.output
new file mode 100644
index 0000000000..2e5bc8e9f0
--- /dev/null
+++ b/regression-tests/test-results/msvc-2022/pure2-bugfix-for-requires-clause-unbraced-function-initializer.cpp.output
@@ -0,0 +1 @@
+pure2-bugfix-for-requires-clause-unbraced-function-initializer.cpp