Worst ideas/features in programming languages?

[Paul Backus]

On Wednesday, 5 January 2022 at 06:33:39 UTC, Walter Bright wrote:
> On 1/3/2022 7:09 PM, Timon Gehr wrote:
>> To be very clear, I want this:
>> 
>> [(1,2),(3,4)].map!((a,b)=>a+b).each!writeln;
>> 
>> An this is generally what people mean when they talk about 
>> "tuples".
>
> I understand. It looks like a worthy goal.

Is this really necessary or even desirable? Tuples do not 
auto-expand like this in other languages. For example, in Python:

     def fun(*args):
         print(len(args))

     tup = (1, 2, 3)
     fun(1, 2, 3) # prints "3"
     fun(tup) # prints "1"

Even without automatic tuple expansion, Timon's example could be 
written as follows:

     alias apply(alias fun) = (args) => fun(args.tupleof);
     [(1,2), (3,4)].map!(apply!((a, b) => a+b)).each!writeln;