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https://issues.apache.org/jira/browse/GROOVY-8778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16608222#comment-16608222
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ASF GitHub Bot commented on GROOVY-8778:
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Github user asfgit closed the pull request at:
https://github.com/apache/groovy/pull/792
> Cast short-hand breaks for empty map
> ------------------------------------
>
> Key: GROOVY-8778
> URL: https://issues.apache.org/jira/browse/GROOVY-8778
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 3.0.0-alpha-3
> Reporter: Paul King
> Assignee: Paul King
> Priority: Major
> Labels: breaking
>
> We support:
> {code}
> println Date[time:0]
> def map = [time:0]
> println Date[*:map]
> map = [:]
> println Date[*:map]
> {code}
> but not:
> {code}
> println Date[:]
> {code}
> This is a breaking change since we currently support printing an empty map
> without brackets but would require them after this change:
> {code}
> println [:]
> {code}
> would need to be:
> {code}
> println([:])
> {code}
> But we require the brackets for lists (empty and non-empty) and non-empty
> maps already.
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