internal static void extend(Symbol sym, Object val)
{
if (!sym.isDynamic)
throw new Exception("Dynamic vars must have prefix *");
denv = new DynamicEnv(sym, val, denv);
}
internal static void restore(DynamicEnv olddenv)
{
denv = olddenv;
}
private DynamicEnv(Symbol sym, Object val, DynamicEnv next)
{
this.sym = sym;
this.val = val;
this.next = next;
}
