In IntelliJ Scala's debugger, you can open a window to evaluate expressions ( alt + F8 )
However, it always fails as long as I have Scala symbols in the expression (ie, 'foobar), saying:
result = Literal has null value
It was a bug. It is fixed now, so all should work in the next version of the scala plugin.
You can use bugtracker for this kind of questions: http://youtrack.jetbrains.com/issue/SCL-6999
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