Fixup: VTable anchor for MatcherGenericBase

Author: horenmar

src/catch2/matchers/catch_matchers_templated.cpp

@@ -10,6 +10,11 @@
 namespace Catch {
 namespace Matchers {
 
+    std::string MatcherGenericBase::describe() const {
+        using namespace std::string_literals;
+        return "Undescribed generic matcher"s;
+    }
+
     namespace Detail {
 
         std::string describe_multi_matcher(StringRef combine, std::string const* descriptions_begin, std::string const* descriptions_end) {

src/catch2/matchers/catch_matchers_templated.hpp

@@ -22,6 +22,7 @@
 namespace Catch {
 namespace Matchers {
     class MatcherGenericBase : public MatcherUntypedBase {
+        std::string describe() const override;
     public:
         constexpr MatcherGenericBase() = default;
 

tests/SelfTest/UsageTests/MatchersConstexpr.tests.cpp

@@ -21,7 +21,7 @@ namespace {
 
         std::string describe() const override {
             using namespace std::string_literals;
-            return "MatchesAnything"s;
+            return "Matches anything"s;
         }
     };