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Assert_failure("typing/typecore.ml", 264, 4) #6293

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vicuna opened this issue Jan 10, 2014 · 2 comments

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commented Jan 10, 2014

Original bug ID: 6293
Reporter: elnatan
Assigned to: @gasche
Status: closed (set by @xavierleroy on 2015-12-11T18:27:38Z)
Resolution: fixed
Priority: normal
Severity: minor
Version: 4.01.0
Fixed in version: 4.02.0+dev
Category: typing

Bug description

Trying to compile the code below causes an assertion failure in typecore.ml, in both 4.00 and 4.01.

module type S = sig type t = { a : int; b : int; } end
let f (module M : S with type t = int) = { M.a = 0 };;

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commented Jan 23, 2014

Comment author: @xclerc

Fails in 4.00 and 4.01 branches, but trunk (as of revision 14420) raises a proper error:
File "../pr6293.ml", line 2, characters 6-38:
Error: In this `with' constraint, the new definition of t
does not match its original definition in the constrained signature:
Type declarations do not match:
type t
is not included in
type t = { a : int; b : int; }
File "../pr6293.ml", line 1, characters 25-50: Expected declaration
File "../pr6293.ml", line 2, characters 6-38: Actual declaration
Their kinds differ.

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commented May 22, 2014

Comment author: @gasche

This was fixed by Jacques Garrigue in trunk@14400 (January).

@vicuna vicuna closed this Dec 11, 2015

@vicuna vicuna added the typing label Mar 14, 2019

@vicuna vicuna added the bug label Mar 20, 2019

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