diff --git a/.github/workflows/regression-tests.yml b/.github/workflows/regression-tests.yml
index 96071e977..671a892c5 100644
--- a/.github/workflows/regression-tests.yml
+++ b/.github/workflows/regression-tests.yml
@@ -92,7 +92,7 @@ jobs:
         bash run-tests.sh -c ${{ matrix.compiler }} -s ${{ matrix.cxx_std }} -d ${{ matrix.stdlib }} -l ${{ matrix.os }}
 
     - name: Run regression tests - Windows version
-      if: matrix.os == 'windows-latest'
+      if: startsWith(matrix.os, 'windows')
       run: |
         "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Auxiliary\Build\vcvars64.bat" && ^
         git config --local core.autocrlf false && ^
@@ -101,9 +101,36 @@ jobs:
       shell: cmd
 
     - name: Upload patch
-      if: ${{ !cancelled() }}
+      if: success() || failure()
       uses: actions/upload-artifact@v4
       with:
         name: ${{ matrix.os }}-${{ matrix.compiler }}-${{ matrix.cxx_std }}-${{ matrix.stdlib }}.patch
         path: regression-tests/${{ matrix.os }}-${{ matrix.compiler }}-${{ matrix.cxx_std }}-${{ matrix.stdlib }}.patch
         if-no-files-found: ignore
+
+  aggregate-results:
+    needs: regression-tests
+    if:  success() || failure()
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download all patches
+        uses: actions/download-artifact@v4
+        with:
+          path: downloaded-results
+
+      - name: Prepare result files
+        id: prepare_files
+        run: |
+          mkdir aggregated-results
+          echo "Flattening file hierarchy"
+          find . -type f -wholename "./downloaded-results*" -exec mv {} aggregated-results \;
+          patch_count=$(ls aggregated-results 2>/dev/null | wc -l)
+          echo "patch_count=${patch_count}" >> $GITHUB_OUTPUT
+
+      - name: Upload aggregated results
+        if: steps.prepare_files.outputs.patch_count != '0'
+        uses: actions/upload-artifact@v4
+        with:
+          name: aggregated-results
+          path: aggregated-results
+          if-no-files-found: ignore
diff --git a/regression-tests/run-tests.sh b/regression-tests/run-tests.sh
index 6640786fa..b0a41359a 100644
--- a/regression-tests/run-tests.sh
+++ b/regression-tests/run-tests.sh
@@ -17,12 +17,14 @@ usage() {
 # If the diff is not empty print it with the provided message
 report_diff () {
     file="$1"
-    diff_opt="$2"
-    error_msg="$3"
-    patch_file="$4"
+    error_msg="$2"
+    patch_file="$3"
+    # The remaining arguments will be passed to git
+    shift 3
+    diff_opts="$@"
 
     # Compare the content with the reference value checked in git
-    diff_output=$(git diff "$diff_opt" -- "$file")
+    diff_output=$(git diff $diff_opts -- "$file")
     if [[ -n "$diff_output" ]]; then
         echo "            $error_msg:"
         echo "                $file"
@@ -55,17 +57,21 @@ check_file () {
         git add "$file"
         # ... report the diff ...
         report_diff "$file" \
-            "HEAD" \
             "The $description is not tracked by git" \
-            "$patch_file"
+            "$patch_file" \
+            "HEAD"
         # ... and remove the file from the index
         git rm --cached -- "$file" > /dev/null 2>&1
     else
         # Compare the content with the reference value checked in git
+        # Lines includng Windows paths are excluded from diff
+        # This is necessary due to characters in those paths on GitHub runners
+        # that cause git diff to spuriously flag them
         report_diff "$file" \
-            "--ignore-cr-at-eol" \
             "Non-matching $description" \
-            "$patch_file"
+            "$patch_file" \
+            --ignore-cr-at-eol \
+            --ignore-matching-lines="C:\\\\"
     fi
 }
 
diff --git a/regression-tests/test-results/msvc-2022-c++20/mixed-default-arguments.cpp.execution b/regression-tests/test-results/msvc-2022-c++20/mixed-default-arguments.cpp.execution
new file mode 100644
index 000000000..98b5204b6
--- /dev/null
+++ b/regression-tests/test-results/msvc-2022-c++20/mixed-default-arguments.cpp.execution
@@ -0,0 +1,4 @@
+1 "test"
+0 ""
+1 "test"
+0 ""
diff --git a/regression-tests/test-results/msvc-2022-c++20/mixed-default-arguments.cpp.output b/regression-tests/test-results/msvc-2022-c++20/mixed-default-arguments.cpp.output
index e69de29bb..dc74a2a38 100644
--- a/regression-tests/test-results/msvc-2022-c++20/mixed-default-arguments.cpp.output
+++ b/regression-tests/test-results/msvc-2022-c++20/mixed-default-arguments.cpp.output
@@ -0,0 +1 @@
+mixed-default-arguments.cpp
diff --git a/regression-tests/test-results/msvc-2022-c++20/pure2-assert-expected-not-null.cpp.output b/regression-tests/test-results/msvc-2022-c++20/pure2-assert-expected-not-null.cpp.output
index f2e012a95..95f9406df 100644
--- a/regression-tests/test-results/msvc-2022-c++20/pure2-assert-expected-not-null.cpp.output
+++ b/regression-tests/test-results/msvc-2022-c++20/pure2-assert-expected-not-null.cpp.output
@@ -1,20 +1,22 @@
 pure2-assert-expected-not-null.cpp
 pure2-assert-expected-not-null.cpp2(7): error C2039: 'expected': is not a member of 'std'
-predefined C++ types (compiler internal)(348): note: see declaration of 'std'
+predefined C++ types (compiler internal)(347): note: see declaration of 'std'
 pure2-assert-expected-not-null.cpp2(7): error C2062: type 'int' unexpected
 pure2-assert-expected-not-null.cpp2(7): error C2143: syntax error: missing ';' before '{'
 pure2-assert-expected-not-null.cpp2(7): error C2143: syntax error: missing ';' before '}'
 pure2-assert-expected-not-null.cpp2(9): error C2065: 'ex': undeclared identifier
 pure2-assert-expected-not-null.cpp2(9): error C2672: 'cpp2::impl::assert_not_null': no matching overloaded function found
-..\..\..\include\cpp2util.h(632): note: could be 'decltype(auto) cpp2::impl::assert_not_null(_T0 &&)'
+..\..\..\include\cpp2util.h(638): note: could be 'decltype(auto) cpp2::impl::assert_not_null(_T0 &&)'
 pure2-assert-expected-not-null.cpp2(14): error C2039: 'expected': is not a member of 'std'
-predefined C++ types (compiler internal)(348): note: see declaration of 'std'
+predefined C++ types (compiler internal)(347): note: see declaration of 'std'
 pure2-assert-expected-not-null.cpp2(14): error C2062: type 'int' unexpected
 pure2-assert-expected-not-null.cpp2(14): error C2143: syntax error: missing ';' before '{'
 pure2-assert-expected-not-null.cpp2(14): error C2039: 'unexpected': is not a member of 'std'
-predefined C++ types (compiler internal)(348): note: see declaration of 'std'
-pure2-assert-expected-not-null.cpp2(14): error C3861: 'unexpected': identifier not found
+predefined C++ types (compiler internal)(347): note: see declaration of 'std'
+pure2-assert-expected-not-null.cpp2(14): error C2660: 'unexpected': function does not take 1 arguments
+C:\Program Files\Microsoft Visual Studio‚2nterprise\VC\Tools\MSVC.40.33807\includeh.h(33): note: see declaration of 'unexpected'
+pure2-assert-expected-not-null.cpp2(14): note: while trying to match the argument list '(bool)'
 pure2-assert-expected-not-null.cpp2(14): error C2143: syntax error: missing ';' before '}'
 pure2-assert-expected-not-null.cpp2(15): error C2065: 'ex': undeclared identifier
 pure2-assert-expected-not-null.cpp2(15): error C2672: 'cpp2::impl::assert_not_null': no matching overloaded function found
-..\..\..\include\cpp2util.h(632): note: could be 'decltype(auto) cpp2::impl::assert_not_null(_T0 &&)'
+..\..\..\include\cpp2util.h(638): note: could be 'decltype(auto) cpp2::impl::assert_not_null(_T0 &&)'