fixes for gcc-7.2.0.patch

diff --git a/math.cpp b/math.cpp
index 1805323..e919dea 100644
--- a/math.cpp
+++ b/math.cpp
@@ -47,7 +47,7 @@ struct Expression {
                fact.value = value;
        }
        template <typename Stack, typename... T> constexpr void action(Stack & stack, T && ... args) {
-               Fallback fb;
+               Fallback fb {};
                found(stack.template nearest<Fact>(fb), stack, std::forward<T>(args)...);
        }
 };
diff --git a/regexp.cpp b/regexp.cpp
index d4aeb70..29ced7e 100644
--- a/regexp.cpp
+++ b/regexp.cpp
@@ -108,15 +108,15 @@ template<typename CharT, CharT ... string> constexpr auto operator""_re() {
        
        using Parser = Decider<Stack<S>, Input<string...>>;
        static_assert(Parser::correct);
-       return typename Parser::template Type<RegExp<>>{};
+       return typename Parser::template Type<struct RegExp<>>{};
 }
 
 int main() {
        using namespace RegExp;
-       static_assert( std::is_same<decltype("x$"_re), RegExp<Char<'x'>,End>> ::value);
-       static_assert( std::is_same<decltype("^x$"_re), RegExp<Begin,Char<'x'>,End>> ::value);
-       static_assert( std::is_same<decltype("^xy$"_re), RegExp<Begin,Char<'x'>,Char<'y'>,End>> ::value);
-       static_assert( std::is_same<decltype("^."_re), RegExp<Begin,Anything>> ::value);
+       static_assert( std::is_same<decltype("x$"_re), struct RegExp<Char<'x'>,End>> ::value);
+       static_assert( std::is_same<decltype("^x$"_re), struct RegExp<Begin,Char<'x'>,End>> ::value);
+       static_assert( std::is_same<decltype("^xy$"_re), struct RegExp<Begin,Char<'x'>,Char<'y'>,End>> ::value);
+       static_assert( std::is_same<decltype("^."_re), struct RegExp<Begin,Anything>> ::value);
        
        static_assert("^x$"_re.match("x") == true);