daniellansun opened a new pull request, #3073:
URL: https://github.com/apache/groovy/pull/3073

   ## Summary
   
   Unnamed `_` placeholders in multi-assignment, closures, and lambdas no 
longer overwrite a real variable named `_`.
   
   - A single `_` remains a normal variable.
   - Later forms such as `(_, y, _) = ...` still update an existing `_` when 
that name is already in scope.
   - On current master, reading an empty-placeholder `_` already throws 
`MissingPropertyException`; that behavior is left unchanged.
   
   ## JIRA
   
   https://issues.apache.org/jira/browse/GROOVY-11744


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