Allow documenting of extern "Lua" functions

crates/luaffi/src/internal.rs

@@ -6,6 +6,23 @@ use std::{
     hash::{Hash, Hasher},
 };
 
+#[allow(non_camel_case_types)]
+pub mod stub_types {
+    pub struct any;
+    pub struct nil;
+    pub struct boolean;
+    pub struct lightuserdata;
+    pub struct number;
+    pub struct integer;
+    pub struct string;
+    pub struct table;
+    pub struct function;
+    pub struct userdata;
+    pub struct thread;
+    pub struct cdata;
+    pub struct variadic;
+}
+
 pub fn type_id<T: 'static>() -> u64 {
     let mut hash = FxHasher::default();
     TypeId::of::<T>().hash(&mut hash);