Add more comprehensive unregistration tests

- Make sure multiple states don't interfere with each other's keys
- Make sure re-registration of the same type does not cause too many problems
- Make sure the variadics test is present
- Make sure the storage keys are cleared out properly

include/sol/usertype_storage.hpp

@@ -444,6 +444,7 @@ namespace sol { namespace u_detail {
 			storage.clear();
 			string_keys.clear();
 			auxiliary_keys.clear();
+			string_keys_storage.clear();
 		}
 
 		template <bool is_new_index, typename Base>

single/include/sol/config.hpp

@@ -20,8 +20,8 @@
 // CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 // This file was generated with a script.
-// Generated 2020-12-30 02:56:57.400161 UTC
+// Generated 2020-12-30 14:35:06.977732 UTC
-// This header was generated with sol v3.2.3 (revision b9115623)
+// This header was generated with sol v3.2.3 (revision f7d99b05)
 // https://github.com/ThePhD/sol2
 
 #ifndef SOL_SINGLE_CONFIG_HPP

single/include/sol/forward.hpp

@@ -20,8 +20,8 @@
 // CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 // This file was generated with a script.
-// Generated 2020-12-30 02:56:57.318161 UTC
+// Generated 2020-12-30 14:35:06.965732 UTC
-// This header was generated with sol v3.2.3 (revision b9115623)
+// This header was generated with sol v3.2.3 (revision f7d99b05)
 // https://github.com/ThePhD/sol2
 
 #ifndef SOL_SINGLE_INCLUDE_FORWARD_HPP

single/include/sol/sol.hpp

@@ -20,8 +20,8 @@
 // CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 // This file was generated with a script.
-// Generated 2020-12-30 02:56:53.623397 UTC
+// Generated 2020-12-30 14:35:06.134327 UTC
-// This header was generated with sol v3.2.3 (revision b9115623)
+// This header was generated with sol v3.2.3 (revision f7d99b05)
 // https://github.com/ThePhD/sol2
 
 #ifndef SOL_SINGLE_INCLUDE_HPP
@@ -22414,6 +22414,7 @@ namespace sol { namespace u_detail {
 			storage.clear();
 			string_keys.clear();
 			auxiliary_keys.clear();
+			string_keys_storage.clear();
 		}
 
 		template <bool is_new_index, typename Base>

tests/runtime_tests/source/usertypes.unregister.cpp

@@ -25,6 +25,7 @@
 
 #include <catch.hpp>
 
+inline namespace sol2_tests_usertypes_unregister {
 	struct unregister_me {
 		double b = 5.5;
 		std::string f_val = "registered";
@@ -37,6 +38,15 @@ struct unregister_me {
 		}
 	};
 
+	struct goddamnit {};
+
+	struct state_pointer_and_registration {
+		sol::state* lua_ptr;
+		bool* registered_ptr;
+	};
+
+}
+
 TEST_CASE("usertypes/unregister", "make sure that a class can still be bound but that it becomes completely unregistered") {
 	const sol::string_view line1 = "assert(u:f() == 'registered')";
 	const sol::string_view line2 = "assert(urm.a() == 20)";
@@ -145,3 +155,88 @@ TEST_CASE("usertypes/unregister", "make sure that a class can still be bound but
 		REQUIRE(u.f() == "registered");
 	}
 }
+
+TEST_CASE("usertypes/unregister multiple states", "guarantee unregistration can happen from multiple states without interfering with the originals") {
+	sol::state lua0;
+	bool lua0_registered = false;
+	lua0.open_libraries(sol::lib::base);
+	lua0.new_usertype<goddamnit>("goddamnit", "a", sol::property([i=0](){ return i; }));
+	
+	sol::state lua1;
+	bool lua1_registered = false;
+	lua1.open_libraries(sol::lib::base);
+	lua1.new_usertype<goddamnit>("goddamnit", "a", sol::property([i=1](){ return i; }));
+	
+	sol::state lua2;
+	bool lua2_registered = false;
+	lua2.open_libraries(sol::lib::base);
+	lua2.new_usertype<goddamnit>("goddamnit", "a", sol::property([i=2](){ return i; }));
+		
+	state_pointer_and_registration states[] = { { &lua0, &lua0_registered }, { &lua1, &lua1_registered }, { &lua2, &lua2_registered } };
+	const std::size_t number_of_states = std::size(states);
+
+	auto prove = [](sol::state& lua, const bool& is_registered, std::size_t state_index) {
+		std::string code = "val = gdi.a\nprint(val)";
+		if (is_registered) {
+			sol::optional<sol::error> maybe_error = lua.safe_script(code, sol::script_pass_on_error);
+			REQUIRE_FALSE(maybe_error.has_value());
+			sol::optional<std::size_t> maybe_val = lua["val"];
+			REQUIRE(maybe_val.has_value());
+			const std::size_t& val = *maybe_val;
+			REQUIRE(val == state_index);
+		}
+		else {
+			sol::optional<sol::error> maybe_error = lua.safe_script(code, sol::script_pass_on_error);
+			REQUIRE(maybe_error.has_value());
+			const sol::error& error = *maybe_error;
+			std::string err = error.what();
+			REQUIRE((err.find("attempt to index") != std::string::npos) || (err.find("gdi") != std::string::npos));
+		}
+	};
+
+	for (std::size_t i = 0; i < number_of_states; ++i) {
+		state_pointer_and_registration& repr = states[i];
+		sol::state& lua = *repr.lua_ptr;
+		bool& is_registered = *repr.registered_ptr;
+
+		lua["gdi"] = goddamnit{};
+		is_registered = true;
+
+		prove(lua, is_registered, i);
+	}
+	{
+		sol::metatable goddamnit_usertype0 = lua0["goddamnit"];
+		goddamnit_usertype0.unregister();
+		lua0_registered = false;
+	}
+	for (std::size_t i = 0; i < number_of_states; ++i) {
+		state_pointer_and_registration& repr = states[i];
+		sol::state& lua = *repr.lua_ptr;
+		bool& is_registered = *repr.registered_ptr;
+
+		prove(lua, is_registered, i);
+	}
+	{
+		sol::usertype<goddamnit> goddamnit_usertype1 = lua1["goddamnit"];
+		goddamnit_usertype1.unregister();
+		lua1_registered = false;
+	}
+	for (std::size_t i = 0; i < number_of_states; ++i) {
+		state_pointer_and_registration& repr = states[i];
+		sol::state& lua = *repr.lua_ptr;
+		bool& is_registered = *repr.registered_ptr;
+
+		prove(lua, is_registered, i);
+	}
+	{
+		lua0.new_usertype<goddamnit>("goddamnit", "a", sol::property([i=0](){ return i; }));
+		lua0_registered = true;
+	}
+	for (std::size_t i = 0; i < number_of_states; ++i) {
+		state_pointer_and_registration& repr = states[i];
+		sol::state& lua = *repr.lua_ptr;
+		bool& is_registered = *repr.registered_ptr;
+
+		prove(lua, is_registered, i);
+	}
+}

tests/runtime_tests/source/variadics.cpp

@@ -317,3 +317,35 @@ local obj3 = foo3.new(0, 1, 2)
 	     sol::script_pass_on_error);
 	REQUIRE_FALSE(maybe_err.has_value());
 }
+
+TEST_CASE("variadics/overloads with fallbacks",
+     "Test that 'fuzzy' types like optional and variadic_args can coexist and have optional numbers of arguments passed to them") {
+
+	sol::state lua;
+	lua.open_libraries(sol::lib::base);
+
+	auto test = lua[u8"test"].get_or_create<sol::table>();
+	auto derp = test[u8"derp"].get_or_create<sol::table>();
+
+	derp[u8"herp"]
+	     = sol::overload([](sol::this_state, const std::string_view&, const std::string_view&, const std::string_view&, sol::optional<uint32_t>) { return 1; },
+	          [](const std::string_view&, const std::string_view&, sol::function, sol::optional<uint32_t>) { return 2; },
+	          [](sol::this_state, sol::variadic_args) { return 3; });
+
+	const std::string_view code = R"(
+assert(test.derp.herp('str1', 'str2', 'str3') == 1);
+assert(test.derp.herp('str1', 'str2', 'str3', 42) == 1);
+assert(test.derp.herp('str1', 'str2', 'str3', nil) == 1);
+
+assert(test.derp.herp('str1', 'str2', function(r) end) == 2);
+assert(test.derp.herp('str1', 'str2', function(r) end, 42) == 2);
+assert(test.derp.herp('str1', 'str2', function(r) end, nil) == 2);
+
+assert(test.derp.herp('str1', 'str2', 'str3', {}) == 3);
+assert(test.derp.herp('str1', 'str2', function(r) end, {}) == 3);
+assert(test.derp.herp(1, 2, 3, 4, 5, 6, 7) == 3);
+assert(test.derp.herp('str1', 'str2', 'str3', 'str4') == 3);
+)";
+	sol::optional<sol::error> maybe_error = lua.safe_script(code, sol::script_pass_on_error);
+	REQUIRE_FALSE(maybe_error.has_value());
+}