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Soundness bug with GADTs and lazy #7421

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vicuna opened this issue Nov 25, 2016 · 3 comments
Closed

Soundness bug with GADTs and lazy #7421

vicuna opened this issue Nov 25, 2016 · 3 comments
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@vicuna
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@vicuna vicuna commented Nov 25, 2016

Original bug ID: 7421
Reporter: @lpw25
Assigned to: @garrigue
Status: resolved (set by @garrigue on 2016-12-10T02:48:23Z)
Resolution: fixed
Priority: normal
Severity: minor
Version: 4.04.0
Fixed in version: 4.05.0 +dev/beta1/beta2/beta3/rc1
Category: typing
Monitored by: @gasche @yallop

Bug description

The exhaustivity/refutation checks do not taken into account the hidden | member of the lazy type:

  # type (_, _) eq = Refl : ('a, 'a) eq;;
  type (_, _) eq = Refl : ('a, 'a) eq
  # type empty = (int, unit) eq;;
  type empty = (int, unit) eq
  # let f (x : ('a, empty Lazy.t) result) =
      match x with
      | Ok x -> x
      | Error (lazy _) -> .;;
        val f : ('a, empty Lazy.t) result -> 'a = <fun>
  # (f (Error (lazy (raise Not_found))) : string list list);;
  Segmentation fault
@vicuna
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@vicuna vicuna commented Dec 10, 2016

Comment author: @garrigue

Fixed by commit 2608a18.
Do not split in a lazy pattern.

@vicuna vicuna closed this as completed Dec 10, 2016
@vicuna
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@vicuna vicuna commented Dec 10, 2016

Comment author: @gasche

Is this really fixed in 2608a18? It doesn't seem related to lazy patterns
2608a18

(I was curious to have a look at the patch. Would you have forgotten to commit it?)

@vicuna
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@vicuna vicuna commented Dec 10, 2016

Comment author: @garrigue

Sorry, this was the fix for #7424.

This PR is actually fixed by commit d8429e5.

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