guard expression with variable shadowing brakes type guarantee

[EliasDerHai]

There is a bug regarding guard expressions that seems to occur in combination with variable shadowing

import gleam/option.{type Option, Some}
import gleeunit

pub fn main() -> Nil {
  gleeunit.main()
}

pub type Container {
  Container(x: Option(Int), y: Int)
}

pub fn guard_clause_shadowing_bug_test() {
  let x: Option(Int) = Some(999)

  case Some(42) {
    Some(x) if x < 0 -> Container(Some(x), 1)
    _ -> {
      // x is type Option(Int) but at runtime (js) Option is lost 
      // as such `42` is set where a Option(42) should be according to the Container type
      echo x
      Container(x:, y: 0)
    }
  }
}

Note that without the first branch - so simply

let Container(x:, y: _) = case x {
    _ -> {
      Container(x:, y: 0)
    }
  }

does not produce the bug!

• gleam 1.13.0
• target = "javascript"

gleam_log = trace output:

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warning: Redundant record
   ┌─ /.../code/backend/reproduction/guard_bug/test/guard_bug_test.gleam:15:8
   │
15 │   case Some(42) {
   │        ^^^^^^^^ You can remove this record wrapper

Instead of building a record and matching on it, you can match on its
contents directly.
A case expression can take multiple subjects separated by commas like this:

    case one_subject, another_subject {
      _, _ -> todo
    }

See: https://tour.gleam.run/flow-control/multiple-subjects/

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   Compiled in 0.03s
    Running guard_bug_test.main
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42
�[32m.�[39m�[32m
1 passed, no failures�[39m

[GearsDatapacks]

This seems to be a bug with the decision tree built up by the exhaustiveness checker. It seems to have seen that Some(x) always matches (since you have explicitly passed a Some variant to the case expression), so it lifts the shadowing to the outer scope, even though it should only bind x in the first branch.

The code that is generated is the following:

let x = new Some(999)
let x$1 = x[0];
if (x$1 < 0) {
  return new Container(new Some(x$1), 1);
} else {
  echo(x$1);
  return new Container(x$1, 0)
}

[EliasDerHai]

Thanks for the quick reponse!

yes I can also see the same generated js.
I don't quite think that it only happens with deterministic case expressions

For example I can:

pub type Container {
  Container(x: Option(Float), y: Int)
}

pub fn guard_clause_shadowing_bug_test() {
  let x: Option(Float) = Some(float.random())

  case x {
    Some(x) if x <. 0.5 -> Container(Some(x), 1)
    _ -> {
      echo x
      case x {
        Some(s) -> io.println("some " <> s |> string.inspect)
        None -> io.println("none")
      }
      Container(x:, y: 0)
    }
  }
}

again the wrapper (eg. Some/None) is lost and we only have the rand() in this case.

the logs produced here are:

0.7509842120885314 // <- echo
some Nil // <- println

[GearsDatapacks]

The compiler can also infer that case, because you've passed the x variable which must be of the Some variant, so the same optimisation is applied

[EliasDerHai]

True ^^'

sorry I ment like this:

pub type Container {
  Container(x: Option(Int), y: Int)
}

pub fn guard_clause_shadowing_bug_test() {
  let x: Option(Int) = case float.random() <. 99.9 {
    True -> Some(42)
    False -> None
  }

  case x {
    Some(x) if x == 1 -> Container(Some(x), 1)
    _ -> {
      // x is type Option(Int) but at runtime (js) Option is lost 
      // as such `42` is set where a Option(42) should be according to the Container type
      echo x
      Container(x:, y: 0)
    }
  }
}

Here the bug still occurs and the compiler is not able to optimize the case statement due to the runtime check

[GearsDatapacks]

I see, so it's just to do with the scoping of variable bindings in relation to guards

[EliasDerHai]

I see, so it's just to do with the scoping of variable bindings in relation to guards

It seems so. I had a go at it today:

#5097

I'm happy to get any feedback