[
https://issues.apache.org/jira/browse/GROOVY-12128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18093743#comment-18093743
]
ASF GitHub Bot commented on GROOVY-12128:
-----------------------------------------
paulk-asert opened a new pull request, #2665:
URL: https://github.com/apache/groovy/pull/2665
…hat disagree with loop semantics
A do-while runs its body before the first condition check, so its loop
@Invariant only needs to be established by that first body execution; checking
it at loop entry rejected valid loops. The invariant is now checked after each
body execution for do-while (start-of-iteration placement is unchanged for
for/while), and is intentionally not checked at break exits, matching standard
loop-invariant semantics.
A @Decreases variant was measured at the start and end of a single pass,
which misses progress made by a classic for loop's update expression (it runs
after the body end) and demanded non-negativity after the final body execution.
The variant is now evaluated once at the start of each iteration: a scalar
measure must be non-negative at entry (well-foundedness), and consecutive
iteration-start values must strictly decrease. The cross-iteration state is
hoisted into the block directly enclosing the loop; when the loop is not a
direct child of a block (e.g. a braceless if branch), the previous single-pass
measurement is kept as a fallback.
> loop contract checks fire at points that disagree with loop semantics
> ---------------------------------------------------------------------
>
> Key: GROOVY-12128
> URL: https://issues.apache.org/jira/browse/GROOVY-12128
> Project: Groovy
> Issue Type: Improvement
> Components: groovy-contracts
> Reporter: Paul King
> Assignee: Paul King
> Priority: Major
> Fix For: 6.0.0-beta-1
>
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
