Cleanup max upvalues constant a bit, add some luaconf.h assumptions

2 files changed, 3 insertions, 3 deletions

diff --git a/src/ffi.rs b/src/ffi.rs
index 4d1c48e..7568f4a 100644
--- a/src/ffi.rs
+++ b/src/ffi.rs
@@ -34,6 +34,8 @@ pub const LUAI_MAXSTACK: c_int = 1_000_000;
 pub const LUA_REGISTRYINDEX: c_int = -LUAI_MAXSTACK - 1000;
 pub const LUA_RIDX_MAINTHREAD: lua_Integer = 1;
 pub const LUA_RIDX_GLOBALS: lua_Integer = 2;
+// Not actually defined in lua.h / luaconf.h
+pub const LUA_MAX_UPVALUES: c_int = 255;
 
 pub const LUA_TNONE: c_int = -1;
 pub const LUA_TNIL: c_int = 0;
diff --git a/src/function.rs b/src/function.rs
index c75990e..f41a76c 100644
--- a/src/function.rs
+++ b/src/function.rs
@@ -146,12 +146,10 @@ impl<'lua> Function<'lua> {
         let lua = self.0.lua;
         unsafe {
             stack_err_guard(lua.state, 0, || {
-                const MAX_LUA_UPVALUES: c_int = 255;
-
                 let args = args.to_lua_multi(lua)?;
                 let nargs = args.len() as c_int;
 
-                if nargs + 2 > MAX_LUA_UPVALUES {
+                if nargs + 2 > ffi::LUA_MAX_UPVALUES {
                     return Err(Error::BindError);
                 }