Fix MSVC build HEADmaster

gcc apparently has no issues with std::optional<auto> but MSVC does. Not
sure about clang.

2 files changed, 4 insertions, 2 deletions

diff --git a/src/orcus_test_xls_xml.cpp b/src/orcus_test_xls_xml.cpp
index 97e13dfb..627c957d 100644
--- a/src/orcus_test_xls_xml.cpp
+++ b/src/orcus_test_xls_xml.cpp
@@ -1726,7 +1726,7 @@ void test_xls_xml_skip_error_cells()
         (void)doc;
         assert(!"exception was expected, but was not thrown.");
     }
-    catch (const std::exception& e)
+    catch (const std::exception&)
     {
         // works as expected
     }
diff --git a/src/spreadsheet/debug_state_dumper.cpp b/src/spreadsheet/debug_state_dumper.cpp
index a8291c84..57650d14 100644
--- a/src/spreadsheet/debug_state_dumper.cpp
+++ b/src/spreadsheet/debug_state_dumper.cpp
@@ -77,8 +77,10 @@ void doc_debug_state_dumper::dump_styles(const fs::path& outdir) const
            << "    shrink-to-fit: " << to_string(xf.shrink_to_fit) << std::endl;
     };
 
-    auto optional_value = [&of](std::string_view name, const std::optional<auto>& v, int level=2)
+    auto optional_value = [&of](std::string_view name, const auto& v, int level=2)
     {
+        // v is of type std::optional<T>.
+
         constexpr char q = '"';
         constexpr const char* indent_unit_s = "  ";