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https://issues.apache.org/jira/browse/GROOVY-8539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16433337#comment-16433337
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Paul King commented on GROOVY-8539:
-----------------------------------
One workaround is to use {{@CompileStatic}}.
> Groovy fails to compile assignment operators on boolean array
> -------------------------------------------------------------
>
> Key: GROOVY-8539
> URL: https://issues.apache.org/jira/browse/GROOVY-8539
> Project: Groovy
> Issue Type: Bug
> Components: class generator
> Affects Versions: 3.0.0-alpha-1, 2.4.15
> Reporter: Tony Yoshicedo
> Priority: Major
>
> Groovy fails to compile:
> boolean[] b = [true]; b[0] &= false;
> with an error:
> Caught: BUG! exception in phase 'class generation' in source unit
> 'script_from_command_line' should not reach here
> BUG! exception in phase 'class generation' in source unit
> 'script_from_command_line' should not reach here
> when running:
> groovy -e "boolean[] b = [true]; b[0] &= false;"
> Alternative formats work fine, such as:
> groovy -e "boolean[] b = [true]; b[0] = false && b[0];"
> Similarly affects |= and ^= operators.
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