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PoC of let? #7582

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PoC of let? #7582

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zth
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@zth zth commented Jun 30, 2025

npm i https://pkg.pr.new/rescript-lang/rescript@7582
let getXWithResultAsync = async s => {
  let? Ok({s} as res) = await doStuffResultAsync(s)
  Console.log(s)
  let? Ok(x) = await decodeResAsync(res)
  Ok(x ++ "test")
}

TODO

  • Make sure error messages make sense and are well covered
  • Make sure editor tooling works as expected

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pkg-pr-new bot commented Jun 30, 2025

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rescript

npm i https://pkg.pr.new/rescript-lang/rescript@7582

@rescript/darwin-arm64

npm i https://pkg.pr.new/rescript-lang/rescript/@rescript/darwin-arm64@7582

@rescript/darwin-x64

npm i https://pkg.pr.new/rescript-lang/rescript/@rescript/darwin-x64@7582

@rescript/linux-arm64

npm i https://pkg.pr.new/rescript-lang/rescript/@rescript/linux-arm64@7582

@rescript/linux-x64

npm i https://pkg.pr.new/rescript-lang/rescript/@rescript/linux-x64@7582

@rescript/win32-x64

npm i https://pkg.pr.new/rescript-lang/rescript/@rescript/win32-x64@7582

commit: f3d8afe

@leoliu
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leoliu commented Jul 2, 2025

Looks like a great feature in development!

BTW some languages place ? around the = like ?= or =?. I wonder if this has been considered. This can potentially also be used with if.

@zth
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zth commented Jul 2, 2025

@leoliu thank you! There's now a forum post for the proposal where you can add your thoughts if you want: https://forum.rescript-lang.org/t/proposing-new-syntax-for-zero-cost-unwrapping-options-results/6227

@cknitt cknitt added this to the v12.1 milestone Jul 3, 2025
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