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Structural types forming non-regular trees can be defined through recursive modules. #3935

vicuna opened this issue Dec 29, 2005 · 1 comment


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commented Dec 29, 2005

Original bug ID: 3935
Reporter: anonymous
Status: acknowledged (set by @damiendoligez on 2006-01-05T13:21:33Z)
Resolution: open
Priority: normal
Severity: minor
Version: 3.09.0
Target version: later
Category: typing
Tags: recmod, typing
Related to: #3674 #7726
Monitored by: "Keiko NAKATA"

Bug description

I think this problem is related to the issue 0003674.

Using recursive modules,
I can define structural types forming non-regular trees.
These types can cause non-termination of the core language type checker
when they are used.

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commented Mar 15, 2017

Comment author: @garrigue

It seems that the problem could be avoided by re-checking regularity.
Is it really worth it, as long as we do not have an example of unsoundness?

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