Original bug ID: 6907
Reporter: @ivg
Assigned to: @garrigue
Status: closed (set by @xavierleroy on 2017-02-16T14:14:48Z)
Resolution: fixed
Priority: normal
Severity: minor
Version: 4.02.1
Target version: 4.03.0+dev / +beta1
Fixed in version: 4.03.0+dev / +beta1
Category: typing
Monitored by: @ivg

Bug description

On the following code, compiler fails with "Fatal error: exception Stack overflow"

class type ['e] t = object('s)
method update : 'e -> 's
end

module type S = sig
class base : 'e -> ['e] t
(* ^^^^^^
missed type parameters *)
end

Steps to reproduce

$ ocamlc min.ml

Additional information

The bug is reproducible on at least 4.02.2 and 4.02.1. I didn't try on older versions.

The category is chosen based on an educated guess. I have no real witness, that it is from type checker, other then the error occurs on both ocamlc, ocaml, ocamlopt and even merlin.

Also, when minimizing an example, I've figured out, that the trigger is the return type of update method. If I change update return type to unit for example, the error will not show itself.

File attachments

• min.ml