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https://issues.apache.org/jira/browse/GROOVY-8969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16752181#comment-16752181
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Paul King commented on GROOVY-8969:
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I presume that code in {{TraitComposer}} was written before we added support
for the {{parameters}} switch. The test suite still passes and behavior seems
to be expected with pre-compiled code when we simply just copy the parameter
name. We probably just need to have a suitable workaround (or error) if a
parameter has name {{$self}}.
> Parameter name data is erased when applying traits regardless of --parameters
> setting
> -
>
> Key: GROOVY-8969
> URL: https://issues.apache.org/jira/browse/GROOVY-8969
> Project: Groovy
> Issue Type: Bug
>Affects Versions: 2.5.5
>Reporter: Graeme Rocher
>Priority: Major
>
> When Groovy applies a trait to class it erases parameter name data. You can
> see this here:
> https://github.com/apache/groovy/blob/982bd38b3216ea3143b0d667d2cd47d2c758f884/src/main/java/org/codehaus/groovy/transform/trait/TraitComposer.java#L157
> So regardless whether `-parameters` is specified to the compiler traits will
> not retain parameter name information.
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