SBT shading of JLine and repl-jline seems broken

[retronym]

Or at least, noisy.

Error reading scala/tools/nsc/interpreter/jline/FileBackedHistory$.class: null
Error reading scala/tools/nsc/interpreter/jline/FileBackedHistory.class: null

In a debugger, we see:

java.lang.RuntimeException
    at org.objectweb.asm.MethodVisitor.visitParameter(Unknown Source)
    at org.objectweb.asm.MethodVisitor.visitParameter(Unknown Source)
    at org.objectweb.asm.ClassReader.b(Unknown Source)
    at org.objectweb.asm.ClassReader.accept(Unknown Source)
    at org.objectweb.asm.ClassReader.accept(Unknown Source)
    at org.pantsbuild.jarjar.KeepProcessor.process(KeepProcessor.java:70)
    at org.pantsbuild.jarjar.util.JarProcessorChain.process(JarProcessorChain.java:38)
    at org.pantsbuild.jarjar.MainProcessor.process(MainProcessor.java:115)

I think this will be fixed by pantsbuild/jarjar#18, which updates JarJar to handle classfiles with method parameter names stored.