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
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.
The text was updated successfully, but these errors were encountered:
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.