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Assert_failure in <typing/typedecl.ml> #8360

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vicuna opened this issue Nov 4, 2003 · 2 comments
Closed

Assert_failure in <typing/typedecl.ml> #8360

vicuna opened this issue Nov 4, 2003 · 2 comments
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@vicuna
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vicuna commented Nov 4, 2003

Original bug ID: 1918
Reporter: administrator
Status: closed
Resolution: fixed
Priority: normal
Severity: minor
Category: ~DO NOT USE (was: OCaml general)

Bug description

Full_Name: Damien Pous
Version: 3.07
OS: Debian/GNU Linux (testing/unstable)
Submission from: mailhost.ens-lsh.fr (193.51.131.2)

The following type declaration raise an Assert_failure exception
within the compiler (ocamlc, ocamlopt, toplevel) :

<<

type ('a, 'b) a = 'a -> unit constraint 'a = [> `B of ('a, 'b) b as 'b]

and ('a, 'b) b = 'b -> unit constraint 'b = [> `A of ('a, 'b) a as 'a];;
Fatal error: exception Assert_failure("typing/typedecl.ml", 317, 38)

this bug can also be trigered by the simpler but incorrect following type

<<

type 'a a = 'a constraint 'a = [> `B of 'b b as 'b]

and 'b b = 'b -> unit;;
Fatal error: exception Assert_failure("typing/typedecl.ml", 317, 38)
@vicuna
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vicuna commented Nov 7, 2003

Comment author: administrator

Fixed by Jacques in typedecl.ml (2003-11-07)

@vicuna vicuna closed this as completed Nov 7, 2003
@vicuna
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vicuna commented Nov 7, 2003

Comment author: administrator

From: Damien.Pous@ens-lyon.fr

The following type declaration raise an Assert_failure exception
within the compiler (ocamlc, ocamlopt, toplevel) :

<<

type ('a, 'b) a = 'a -> unit constraint 'a = [> `B of ('a, 'b) b as 'b]

and ('a, 'b) b = 'b -> unit constraint 'b = [> `A of ('a, 'b) a as 'a];;
Fatal error: exception Assert_failure("typing/typedecl.ml", 317, 38)

Indeed, this should rather produce a type error...

This is now fixed in CVS.

Jacques

@vicuna vicuna added the bug label Mar 19, 2019
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@vicuna