[jira] [Created] (GROOVY-12376) LookAndFeelHelper: detect non-metal classes rather than fail with an obscure error

[Paul King (Jira)]

Paul King created GROOVY-12376:
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             Summary: LookAndFeelHelper: detect non-metal classes rather than 
fail with an obscure error
                 Key: GROOVY-12376
                 URL: https://issues.apache.org/jira/browse/GROOVY-12376
             Project: Groovy
          Issue Type: Improvement
            Reporter: Paul King






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