https://bz.mercurial-scm.org/show_bug.cgi?id=6590
Bug ID: 6590
Summary: IndexError: list index out of range in
picksplitsuccessor in evolve/utility.py
Product: Mercurial
Version: stable branch
Hardware: PC
OS: Linux
Status: UNCONFIRMED
Severity: feature
Priority: wish
Component: evolution
Assignee: bugzi...@mercurial-scm.org
Reporter: sph...@gmail.com
CC: mercurial-devel@mercurial-scm.org,
pierre-yves.da...@ens-lyon.org
Python Version: ---
Created attachment 2122
--> https://bz.mercurial-scm.org/attachment.cgi?id=2122&action=edit
Fix for list index out of range error
I am on stable, at bcdccdd48d99. I ran `hg evolve` and got the above error
message.
What seems to be happening is that `_utility.singlesuccessor` throws because it
finds multiple successors, but then when picksplitsuccessor tries to handle
that, it doesn't find any successors at all.
The problem appears to be that singlesuccessor does this loop up through
parents until it finds something, but picksplitsuccessor does not.
I will attach my attempt to work around the problem, which works for me but
uses `:=` and I don't actually understand any of the data model I'm patching.
It might be better to pass down the successors that are stored on the
`MultipleSuccessorsError` exception, rather than looking them up again?
(This fixed my problem locally.)
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