Struct LuaUserDataImpl 

pub struct LuaUserDataImpl {
    pub len: usize,
    pub nuvalue: u16,
    pub metatable: Option<()>,
    pub uv: Vec<()>,
    pub data: Box<[u8]>,
}

Corresponds to C’s Udata: a GC-tracked object carrying a raw byte payload plus optional Lua user values and an optional metatable.

Never constructed: metatable/uv are still placeholder () types rather than GcRef<LuaTable>/LuaValue, and no call site builds a LuaUserDataImpl. The userdata type actually used throughout the VM is lua_types::userdata::LuaUserData.

Fields

len: usize

nuvalue: u16

metatable: Option<()>

uv: Vec<()>

data: Box<[u8]>

Trait Implementations

impl Trace for LuaUserDataImpl

metatable and uv are Option<()> / Vec<()> placeholders with no GC edges to walk; full userdata is lua_types::value::LuaUserData instead.

fn type_name(&self) -> &'static str

Concrete Rust type name for diagnostic/testC telemetry (Heap::type_name_count). Collector behavior must not branch on this. The default covers container blanket impls, which are never GC-boxed directly; concrete runtime types override it with std::any::type_name::<Self>().

fn trace(&self, _m: &mut Marker)