ds_list_unmark_as_map

/// @func ds_list_unmark_as_map
/// @arg {list} list
/// @arg {real} pos
/// @desc Unmarks specified position in list
/// @desc It's your job to keep a reference to whatever's unmarked and delete it yourself!

var _list = argument[0];
var _pos = argument[1];
_list[| _pos] = _list[| _pos];