Function lua_getfenv

pub unsafe extern "C-unwind" fn lua_getfenv(
    L: *mut lua_State,
    idx: c_int,
)

Gets the environment of the value at the given index and pushes it onto the top of the stack.

If the value at the given index does not have an environment, this function will push nil onto the stack. If the value does have an environment, it will be pushed onto the stack.

Only functions and threads have environments.