add missing break to avoid fallthrough

Author: anonrig

.github/workflows/ubuntu_pedantic.yml

@@ -34,7 +34,7 @@ jobs:
         run: cmake -D ADA_TESTING=ON -DBUILD_SHARED_LIBS=${{matrix.shared}} -G Ninja -B build
         env:
           CXX: g++-12
-          CXXFLAGS: -Werror -Wextra -Wno-unused-parameter
+          CXXFLAGS: -Werror -Wextra -Wno-unused-parameter -Wimplicit-fallthrough
       - name: Build
         run: cmake --build build -j=4
       - name: Test

include/ada/url_pattern_helpers-inl.h

@@ -1062,6 +1062,7 @@ constructor_string_parser<regex_provider>::parse(std::string_view input) {
         if (parser.is_hash_prefix()) {
           parser.change_state(State::HASH, 1);
         }
+        break;
       }
       case State::HASH: {
         // Do nothing