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- scala> {implicit def _2opt[A](x: A): Option[A] = Option(x); val a = new java.uti
- l.HashMap[String,String]; a.get("hai").map{x=>x}}
- java.lang.NullPointerException
- at .<init>(<console>:8)
- at .<clinit>(<console>)
- at .<init>(<console>:11)
- at .<clinit>(<console>)
- at $export(<console>)
- at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
- at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
- java:39)
- at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
- sorImpl.java:25)
- at java.lang.reflect.Method.invoke(Method.java:597)
- at scala.tools.nsc.interpreter.IMain$ReadEvalPrint.call(IMain.scala:592)
- at scala.tools.nsc.interpreter.IMain$Request$$anonfun$10.apply(IMain.sca
- la:828)
- at scala.tools.nsc.interpreter.Line$$anonfun$1.apply$mcV$sp(Line.scala:4
- 3)
- at scala.tools.nsc.io.package$$anon$2.run(package.scala:31)
- at java.lang.Thread.run(Thread.java:662)
- scala>
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