Pasting a method causes crash

I've created an empty app, enabled debugport and then run from Android Studio on a real device.

04-15 19:51:42.065 8126-8132/com.example.live.myapplication I/zygote64: After code cache collection, code=61KB, data=51KB
    Increasing code cache capacity to 256KB
04-15 19:51:46.384 8126-9149/com.example.live.myapplication I/DebugClientConnection: Client closing:Socket[address=/10.1.1.10,port=3678,localPort=8562]
04-15 19:51:46.390 8126-9149/com.example.live.myapplication E/AndroidRuntime: FATAL EXCEPTION: Thread-9
    Process: com.example.live.myapplication, PID: 8126
    bsh.Parser$LookaheadSuccess
        at bsh.Parser.<init>(Parser.java:5981)
        at bsh.Interpreter.<init>(Interpreter.java:181)
        at bsh.Interpreter.<init>(Interpreter.java:221)
        at bsh.Interpreter.<init>(Interpreter.java:236)
        at bsh.Interpreter.<init>(Interpreter.java:247)
        at jwf.debugport.internal.debug.DebugClientConnection.run(DebugClientConnection.java:32)
        at java.lang.Thread.run(Thread.java:764)

Pasting the code from https://stackoverflow.com/a/40566060/229631 appears to cause a crash.

I'm using netcat to connect if that makes a difference.

Doing some more testing, it seems like pasting public static ArrayList<String> getConnectedDevicesMac() is enough to cause a crash.

Also seems to affect upstream.