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Assertion failed in Typecore.expand_path #6394

vicuna opened this issue May 5, 2014 · 1 comment

Assertion failed in Typecore.expand_path #6394

vicuna opened this issue May 5, 2014 · 1 comment


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vicuna commented May 5, 2014

Original bug ID: 6394
Reporter: @alainfrisch
Assigned to: @garrigue
Status: closed (set by @xavierleroy on 2015-12-11T18:26:50Z)
Resolution: fixed
Priority: normal
Severity: minor
Fixed in version: 4.02.0+dev
Category: typing

Bug description

It is possible to reach the "assert false" in Typecore.expand_path with the following code:

module rec X : sig
type t = int * bool
end = struct
type t = A | B
let f = function A | B -> 0

Returning the "p" argument instead of failure seems to fix the problem, but I'd prefer if someone more knowledgeable could confirm this is the right fix.

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vicuna commented May 7, 2014

Comment author: @garrigue

Fixed as suggested in trunk at revision 14757.

I scratched my head a while to understand what is happening:
we are expanding the path of a datatype, so if the environment
is correctly constructed, it can only be a datatype (or an abstract
type is some file is missing).
However, recursive modules may break this invariant by adding
an incoherent equation, which will be detected later.

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