[sedatk]

Which languages do have such a thing?

[steveklabnik]

Rust does this, if you don’t call await on them. You can then await on the join of both.

[sedatk]

Is the "join" syntax part of the language?

[deathanatos]

Why is having it be syntax necessary or beneficial?

One might say "Rust's existing feature set makes this possible already, why dedicate syntax where none is needed?"

(…and I think that's a reasonably pragmatic stance, too. Joins/selects are somewhat infrequent, the impediments that writing out a join puts on the program relatively light… what problem would be solved?

vs. `?`, which sugars a common thing that non-dedicated syntax can represent (a try! macro is sufficient to replace ?) but for which the burden on the coder is much higher, in terms of code readability & writability.)

[tcfhgj]

no

https://doc.rust-lang.org/std/future/macro.join.html

[sedatk]

Then it doesn’t apply in this case.

[tcfhgj]

why?

[sedatk]

Because parent asked for a language feature, not runtime: "One thing that most languages are lacking..."

[Twey]

I suppose Haskell does, as `(+) <$> f1 <*> f2`.

[raluk]

In there is also ApplicativeDo that works nicely with this.

    do 
      x <- f1
      y <- f2
      return $ x + y

this is evaluated as applicative in same way.