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Fatal error: exception Assert_failure("typing/ctype.ml", 1518, 10) #3909

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vicuna opened this issue Dec 5, 2005 · 3 comments
Closed

Fatal error: exception Assert_failure("typing/ctype.ml", 1518, 10) #3909

vicuna opened this issue Dec 5, 2005 · 3 comments
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vicuna commented Dec 5, 2005

Original bug ID: 3909
Reporter: abergou
Assigned to: @garrigue
Status: closed (set by @xavierleroy on 2006-08-01T01:09:04Z)
Resolution: fixed
Priority: normal
Severity: crash
Version: 3.08.3
Category: ~DO NOT USE (was: OCaml general)

Bug description

the attached code produces an assert failure...
(ocaml 3.08.3, Debian testing/GNU Linux)

it used to typecheck correctly about a year ago.

--
Damien Pous
Damien.Pous@ens-lyon.fr
(I am afraid there was no explicit way to give my email, so that you contact
me if necessary; while in anonymous mode...)

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vicuna commented Dec 5, 2005

Comment author: anonymous

I cannot myself check with 3.09...
However it seems the problem remains
(no "assertion failure" but something like "method color not found")

@vicuna
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vicuna commented Dec 5, 2005

Comment author: @garrigue

Indeed, this did typecheck in 3.08.2 (fixing small typos.)
Unfortunately variances were unsound, so this had to be changed afterwards.

The modified version objets_damien2.ml typechecks on 3.09.0,
by adding explicit variance annotations.

I see 2 problems here:

  • this mysterious failure in the non-generalizable case
  • the spurious need for variance annotations

Jacques

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vicuna commented Dec 5, 2005

Comment author: @garrigue

The first point is now fixed in the CVS version, branch release309.
This was just a wrong assertion in Ctype.unify3.

The second point would require a deep analysis of constraints.

@vicuna vicuna closed this as completed Aug 1, 2006
@vicuna vicuna added the bug label Mar 19, 2019
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