public override IContext Reduce(IContext ctx)
{
var tail = BuiltIn.Tail(Cdr);
if (tail == ClCell.Nil || BuiltIn.Cdr(tail) != ClCell.Nil)
{
throw new SyntaxError("Invalid body of the let special form");
}
var beginBody = VariableDefinitionExpressions().Append(BuiltIn.Car(tail)).ListOf();
var begin = new ClCell(ClSymbol.Begin, beginBody);
var lambda = BuiltIn.ListOf(ClSymbol.Lambda, ClCell.Nil, begin);
return(BuiltIn.ListOf(lambda).Reduce(ctx));
}
