Github user dbtsai commented on the issue:
https://github.com/apache/spark/pull/22246
`SparkILoopInterpreter.scala` and `SparkExprTyper.scala` are only on 2.11
branch. It can not be compiled in 2.12. I think it's okay to have them in 2.11
branch since they are not needed in 2.12. We can remove those two files when
the support of 2.11 is ended.
```
[error]
/Users/d_tsai/dev/clean/apache-spark/repl/src/main/scala/org/apache/spark/repl/SparkILoopInterpreter.scala:80:
overriding lazy value importableSymbolsWithRenames in class ImportHandler of
type List[(this.intp.global.Symbol, this.intp.global.Name)];
[error] lazy value importableSymbolsWithRenames needs `override' modifier
[error] lazy val importableSymbolsWithRenames: List[(Symbol, Name)] =
{
[error] ^
[warn] two warnings found
[error] one error found
[error] Compile failed at Aug 27, 2018 11:51:19 AM [0.613s]
```
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