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https://issues.apache.org/jira/browse/LUCENE-5152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13726429#comment-13726429
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Jack Krupansky commented on LUCENE-5152:
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bq. immutale

Is that the Latin term for "immutable"??

(spelling in summary line)

                
> Lucene FST is not immutale
> --------------------------
>
>                 Key: LUCENE-5152
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5152
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: core/FSTs
>    Affects Versions: 4.4
>            Reporter: Simon Willnauer
>            Priority: Blocker
>             Fix For: 5.0, 4.5
>
>         Attachments: LUCENE-5152.patch, LUCENE-5152.patch
>
>
> a spinnoff from LUCENE-5120 where the analyzing suggester modified a returned 
> output from and FST (BytesRef) which caused sideffects in later execution. 
> I added an assertion into the FST that checks if a cached root arc is 
> modified and in-fact this happens for instance in our MemoryPostingsFormat 
> and I bet we find more places. We need to think about how to make this less 
> trappy since it can cause bugs that are super hard to find.

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