From ff8ac8a6d4576d085670ee1134bccd06a3d090e5 Mon Sep 17 00:00:00 2001
From: ThePhD <phdofthehouse@gmail.com>
Date: Thu, 11 Aug 2016 11:36:39 -0400
Subject: [PATCH] One day I'll have a perfect release...

---
 sol/stack_push.hpp |  2 +-
 tests.cpp          | 22 ++++++++++++++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/sol/stack_push.hpp b/sol/stack_push.hpp
index ab253c0b..30aac967 100644
--- a/sol/stack_push.hpp
+++ b/sol/stack_push.hpp
@@ -182,7 +182,7 @@ namespace sol {
 
 		template<typename T>
 		struct pusher<T, std::enable_if_t<std::is_base_of<reference, T>::value || std::is_base_of<stack_reference, T>::value>> {
-			static int push(lua_State*, T& ref) {
+			static int push(lua_State*, const T& ref) {
 				return ref.push();
 			}
 
diff --git a/tests.cpp b/tests.cpp
index 92d76b3d..098dd103 100644
--- a/tests.cpp
+++ b/tests.cpp
@@ -560,3 +560,25 @@ TEST_CASE("optional/left-out-args", "Make sure arguments can be left out of opti
         )");
 	);
 }
+
+TEST_CASE("pusher/constness", "Make sure more types can handle being const and junk") {
+	struct Foo {
+		Foo(sol::function& f) : _f(f) {}
+		const sol::function& _f;
+
+		const sol::function& f() const { return _f; }
+	};
+
+	sol::state lua;
+
+	lua.new_usertype<Foo>("Foo",
+		sol::call_constructor, sol::no_constructor,
+		"f", &Foo::f
+		);
+
+	lua["func"] = []() { return 20; };
+	lua["foo"] = Foo(lua["func"]);
+	Foo& foo = lua["foo"];
+	int x = foo.f()();
+	REQUIRE(x == 20);
+}