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Type unsoundness bug with polymorphic variants #8134
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Comment author: administrator On Thu, 8 May 2003, Jacques Garrigue wrote:
I rewrote the type as you suggested, and split the Matrix module out of Somehow, I'm not getting the open polymorphism that I want, as the Matrix I was expecting to be able to extend the the type cell, much as you extended -- Brian |
Comment author: administrator From: brogoff@speakeasy.net
Indeed, the behaviour of type definitions seems to differ in .ml and The problem is your use of 'b = ('a,'b) structure in place of the real So the right formulation would be This allows you to write a .mli. Jacques |
Comment author: administrator two bugs fixed by JG (2003-05-13) |
Original bug ID: 1673
Reporter: administrator
Status: closed
Resolution: fixed
Priority: normal
Severity: minor
Category: ~DO NOT USE (was: OCaml general)
Bug description
Hi,
I've attached a gzipped tarball which causes the problem on 3.06 and above,
including the latest CVS snapshots. See the file test.ml. At the very end I
call a function on a type I shouldn't be able to and get a segfault. The code
essentially follows the code in Jacques Garrigue's "Code reuse through
Polymorphic Variants", but the application is modeling an evaluator for
abutting rectangular geometric structures on a plane. Run
touch depend
make depend
make
pvtst
and you'll get the segfault.
generated a "signature" which didn't match. So I guess this is two bug reports,
one for the unsoundness, and one for this behavior, but I guess they are
related.
-- Brian
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