Function tlua::ffi::luaT_tolstring

pub unsafe extern "C" fn luaT_tolstring(
    l: *mut lua_State,
    idx: c_int,
    len: *mut usize,
) -> *const c_char

Convert the value at idx to string using __tostring metamethod if other measures didn’t work and return it. Sets the len if it’s not NULL. The newly created string is left on top of the stack. [-0, +1, m]