From 2658433bd187386cf0c6a10a61d4fa14f229c0fe Mon Sep 17 00:00:00 2001
From: Timidger <APragmaticPlace@gmail.com>
Date: Sat, 28 Oct 2017 20:46:24 -0700
Subject: [PATCH 1/5] Added ability to load debug lib, Fixes #52

---
 src/lua.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/lua.rs b/src/lua.rs
index b765dfd..53a0b4b 100644
--- a/src/lua.rs
+++ b/src/lua.rs
@@ -557,6 +557,14 @@ impl Lua {
         }
     }
 
+    /// Loads the Lua debug library.
+    ///
+    /// The debug library is very unsound, loading it and using it breaks all
+    /// the guarantees of rlua.
+    pub unsafe fn load_debug(&self) {
+        ffi::luaL_requiref(self.state, cstr!("debug"), ffi::luaopen_debug, 1);
+    }
+
     /// Loads a chunk of Lua code and returns it as a function.
     ///
     /// The source can be named by setting the `name` parameter. This is generally recommended as it

From 26b7901ab35b7094ef8e3dfe623045f2670aa686 Mon Sep 17 00:00:00 2001
From: Timidger <APragmaticPlace@gmail.com>
Date: Sun, 29 Oct 2017 14:53:30 -0700
Subject: [PATCH 2/5] Added test for loading unsafe debug library in Lua

---
 src/tests.rs | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/tests.rs b/src/tests.rs
index 327d997..028f0be 100644
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -14,6 +14,23 @@ fn test_load() {
     assert!(lua.load("§$%§&$%&", None).is_err());
 }
 
+#[test]
+fn test_load_debug() {
+    let lua = Lua::new();
+    lua.eval::<()>("debug", None).unwrap();
+    unsafe {
+        lua.load_debug();
+    }
+    match lua.eval("debug", None).unwrap() {
+        Value::Table(_) => {},
+        val => {
+            panic!("Expected table for debug library, got {:#?}", val)
+        }
+    }
+    let traceback_output = lua.eval::<String>("debug.traceback()", None).unwrap();
+    assert_eq!(traceback_output.split("\n").next(), "stack traceback:".into());
+}
+
 #[test]
 fn test_exec() {
     let lua = Lua::new();

From 316c6976e45096e74d80e58e8efb46227a2b6afa Mon Sep 17 00:00:00 2001
From: Timidger <APragmaticPlace@gmail.com>
Date: Sun, 29 Oct 2017 14:54:55 -0700
Subject: [PATCH 3/5] Added pop after loading lua library

---
 src/lua.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/lua.rs b/src/lua.rs
index 53a0b4b..18c0ca7 100644
--- a/src/lua.rs
+++ b/src/lua.rs
@@ -563,6 +563,7 @@ impl Lua {
     /// the guarantees of rlua.
     pub unsafe fn load_debug(&self) {
         ffi::luaL_requiref(self.state, cstr!("debug"), ffi::luaopen_debug, 1);
+        ffi::lua_pop(self.state, 1);
     }
 
     /// Loads a chunk of Lua code and returns it as a function.

From 71fdca547700c5a206cd456b5ee37f06fa26e4e2 Mon Sep 17 00:00:00 2001
From: Timidger <APragmaticPlace@gmail.com>
Date: Sun, 29 Oct 2017 15:24:54 -0700
Subject: [PATCH 4/5] Fixed test to use Lua assert

---
 src/tests.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/tests.rs b/src/tests.rs
index 028f0be..c2e3e00 100644
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -17,7 +17,7 @@ fn test_load() {
 #[test]
 fn test_load_debug() {
     let lua = Lua::new();
-    lua.eval::<()>("debug", None).unwrap();
+    lua.exec::<()>("assert(debug == nil)", None).unwrap();
     unsafe {
         lua.load_debug();
     }

From a1370860642076caf23f4aca084c5df8a46d7d7e Mon Sep 17 00:00:00 2001
From: Timidger <APragmaticPlace@gmail.com>
Date: Sun, 29 Oct 2017 15:26:40 -0700
Subject: [PATCH 5/5] Check that we have enough room on stack for module

---
 src/lua.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/lua.rs b/src/lua.rs
index 18c0ca7..b9cdfe9 100644
--- a/src/lua.rs
+++ b/src/lua.rs
@@ -562,6 +562,7 @@ impl Lua {
     /// The debug library is very unsound, loading it and using it breaks all
     /// the guarantees of rlua.
     pub unsafe fn load_debug(&self) {
+        check_stack(self.state, 1);
         ffi::luaL_requiref(self.state, cstr!("debug"), ffi::luaopen_debug, 1);
         ffi::lua_pop(self.state, 1);
     }