diff --git a/testspr/print.hpp b/testspr/print.hpp
index 8530e622..8eaabfb7 100644
--- a/testspr/print.hpp
+++ b/testspr/print.hpp
@@ -24,6 +24,28 @@
 #include <testspr/typeinfo.hpp>
 
 namespace testspr {
+	namespace detail {
+		inline SPROUT_NON_CONSTEXPR std::ostream&
+		to_string_impl(std::ostream& os) {
+			return os;
+		}
+		template<typename Head, typename... Tail>
+		inline SPROUT_NON_CONSTEXPR std::ostream&
+		to_string_impl(std::ostream& os, Head const& head, Tail const&... tail) {
+			return testspr::detail::to_string_impl(os << head, tail...);
+		}
+	}	// namespace detail
+	//
+	// to_string
+	//
+	template<typename Head, typename... Tail>
+	inline SPROUT_NON_CONSTEXPR std::string
+	to_string(Head const& head, Tail const&... tail) {
+		std::ostringstream os;
+		testspr::detail::to_string_impl(os, head, tail...);
+		return os.str();
+	}
+
 	//
 	// print
 	//
@@ -144,12 +166,13 @@ namespace testspr {
 	template<typename T>
 	inline SPROUT_NON_CONSTEXPR void
 	print_hl(T const& t) {
-		std::ostringstream oss;
-		oss << t;
-		std::string s(oss.str());
-		for (std::string::size_type i = 0, last = 80 / s.size(); i != last; ++i) {
+		std::string s(testspr::to_string(t));
+		for (std::string::size_type i = 0, n = 80 / s.size(); i != n; ++i) {
 			std::cout << s;
 		}
+		for (std::string::const_iterator it = s.begin(), last = s.begin() + 80 % s.size(); it != last; ++it) {
+			std::cout << *it;
+		}
 		std::cout << std::endl;
 	}
 
diff --git a/testspr/trace.hpp b/testspr/trace.hpp
index 0fc6d666..6fa195b7 100644
--- a/testspr/trace.hpp
+++ b/testspr/trace.hpp
@@ -488,12 +488,12 @@ namespace testspr {
 	// TESTSPR_TRACE_BLOCK
 	//
 #	define TESTSPR_TRACE_BLOCK(name) \
-		testspr::block_tracer SPROUT_PP_CAT(testspr_block_tracer_, __LINE__)(__FILE__, __LINE__, name)
+		testspr::block_tracer SPROUT_PP_CAT(testspr_block_tracer_, __LINE__)(__FILE__, __LINE__, testspr::to_string(name))
 	//
 	// TESTSPR_TRACE_BLOCK_EXPR
 	//
 #	define TESTSPR_TRACE_BLOCK_EXPR(name) \
-		((void)testspr::block_tracer(__FILE__, __LINE__, name))
+		((void)testspr::block_tracer(__FILE__, __LINE__, testspr::to_string(name)))
 
 	namespace detail {
 		inline SPROUT_NON_CONSTEXPR bool
@@ -545,7 +545,7 @@ namespace testspr {
 	// TESTSPR_TRACE_MARK
 	//
 #	define TESTSPR_TRACE_MARK(name) \
-		((void)testspr::trace_stack::instance().notify_mark(name, __FILE__, __LINE__))
+		((void)testspr::trace_stack::instance().notify_mark(testspr::to_string(name), __FILE__, __LINE__))
 
 	//
 	// TESTSPR_PRINT_TRACE_STACK