The Tail Operator '#' enables clean typechecked builders with minimal language changes.

[Kagamin]

On Friday, 25 January 2019 at 07:24:10 UTC, FeepingCreature wrote:
> But with the tail operator, this becomes:
>
>     Foo.build
>       #.a = 3
>       #.b = 4
>       #.c = 5
>       #.value;
>
> Which is pure, typechecked, easy to extend and still readable.
>
> What do you think?

This is shorter and cleaner:

     Foo.build
       .a(3)
       .b(4)
       .c(5)
       .value;