Github user DieBauer commented on the issue:
https://github.com/apache/flink/pull/3036
Looks like the buildjob ran out of memory:
```
Running org.apache.flink.api.scala.ScalaShellITCase
Running org.apache.flink.api.scala.ScalaShellLocalStartupITCase
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 16.355 sec
- in org.apache.flink.api.scala.ScalaShellLocalStartupITCase
java.lang.OutOfMemoryError: Java heap space
```
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