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https://issues.apache.org/jira/browse/GROOVY-8079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17561968#comment-17561968
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Paul King commented on GROOVY-8079:
-----------------------------------
The ability to leave off the leading zero was added for Groovy 4 as part of
GROOVY-8678:
[https://github.com/apache/groovy-website/blob/asf-site/site/src/site/releasenotes/groovy-4.0.adoc#support-for-decimal-fraction-literals-without-a-leading-zero]
> Literal numeric constants cannot start with or end with a dot
> -------------------------------------------------------------
>
> Key: GROOVY-8079
> URL: https://issues.apache.org/jira/browse/GROOVY-8079
> Project: Groovy
> Issue Type: Bug
> Components: Compiler
> Affects Versions: 2.4.8
> Environment: Windows, but probably generic
> Reporter: Tomas Rokicki
> Priority: Minor
>
> Groovy prefers the . (dereference) operator over the decimal interpretation,
> but does not permit use of decimals that are conventional:
> groovy:000> .3
> groovysh_parse: 2: unexpected token: . @ line 2, column 1.
> .3
> ^
> groovy:000> (.3)
> groovysh_parse: 2: unexpected token: . @ line 2, column 2.
> (.3)
> ^
> groovy:000> (3.)
> groovysh_parse: 2: unexpected token: ) @ line 2, column 4.
> (3.)
> ^
> groovy:000> -.3
> groovysh_parse: 2: unexpected token: . @ line 2, column 2.
> -.3
> ^
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