java.lang.NullPointerException
at org.kframework.backend.java.kil.KItem.toString(KItem.java:823)
at com.google.common.base.Joiner.toString(Joiner.java:434)
at com.google.common.base.Joiner.appendTo(Joiner.java:111)
at com.google.common.base.Joiner.appendTo(Joiner.java:152)
at com.google.common.base.Joiner.appendTo(Joiner.java:140)
at org.kframework.backend.java.kil.KCollection.toString(KCollection.java:86)
at org.kframework.backend.java.kil.KItem.toStringImpl(KItem.java:843)
at org.kframework.backend.java.kil.KItem.toString(KItem.java:822)
at com.google.common.base.Joiner.toString(Joiner.java:434)
at com.google.common.base.Joiner.appendTo(Joiner.java:111)
at com.google.common.base.Joiner.appendTo(Joiner.java:152)
at com.google.common.base.Joiner.appendTo(Joiner.java:140)
at org.kframework.backend.java.kil.KCollection.toString(KCollection.java:86)
at org.kframework.backend.java.kil.KItem.toStringImpl(KItem.java:843)
at org.kframework.backend.java.kil.KItem.toString(KItem.java:822)
at com.google.common.base.Joiner.toString(Joiner.java:434)
at com.google.common.base.Joiner.appendTo(Joiner.java:111)
at com.google.common.base.Joiner.appendTo(Joiner.java:152)
at com.google.common.base.Joiner.appendTo(Joiner.java:140)
at org.kframework.backend.java.kil.KCollection.toString(KCollection.java:86)
at org.kframework.backend.java.kil.KItem.toStringImpl(KItem.java:843)
at org.kframework.backend.java.kil.KItem.toString(KItem.java:822)
at com.google.common.base.Joiner.toString(Joiner.java:434)
at com.google.common.base.Joiner.appendTo(Joiner.java:111)
at com.google.common.base.Joiner.appendTo(Joiner.java:152)
at com.google.common.base.Joiner.appendTo(Joiner.java:140)
at org.kframework.backend.java.kil.KCollection.toString(KCollection.java:86)
at org.kframework.backend.java.kil.KItem.toStringImpl(KItem.java:843)
at org.kframework.backend.java.kil.KItem.toString(KItem.java:822)
at com.google.common.base.Joiner.toString(Joiner.java:434)
at com.google.common.base.Joiner.appendTo(Joiner.java:111)
at com.google.common.base.Joiner.appendTo(Joiner.java:152)
at com.google.common.base.Joiner.appendTo(Joiner.java:140)
at org.kframework.backend.java.kil.KCollection.toString(KCollection.java:86)
at org.kframework.backend.java.kil.KItem.toStringImpl(KItem.java:843)
at org.kframework.backend.java.kil.KItem.toString(KItem.java:822)
at com.google.common.base.Joiner.toString(Joiner.java:434)
at com.google.common.base.Joiner.appendTo(Joiner.java:111)
at com.google.common.base.Joiner.appendTo(Joiner.java:152)
at com.google.common.base.Joiner.appendTo(Joiner.java:140)
at org.kframework.backend.java.kil.KCollection.toString(KCollection.java:86)
at org.kframework.backend.java.kil.KItem.toStringImpl(KItem.java:843)
at org.kframework.backend.java.kil.KItem.toString(KItem.java:822)
at com.google.common.base.Joiner.toString(Joiner.java:434)
at com.google.common.base.Joiner.appendTo(Joiner.java:111)
at com.google.common.base.Joiner.appendTo(Joiner.java:152)
at com.google.common.base.Joiner.appendTo(Joiner.java:140)
at org.kframework.backend.java.kil.KCollection.toString(KCollection.java:86)
at org.kframework.backend.java.kil.KItem.toStringImpl(KItem.java:843)
at org.kframework.backend.java.kil.KItem.toString(KItem.java:822)
at com.google.common.base.Joiner.toString(Joiner.java:434)
at com.google.common.base.Joiner.appendTo(Joiner.java:111)
at com.google.common.base.Joiner.appendTo(Joiner.java:152)
at com.google.common.base.Joiner.appendTo(Joiner.java:140)
at org.kframework.backend.java.kil.KCollection.toString(KCollection.java:86)
at org.kframework.backend.java.kil.KItem.toStringImpl(KItem.java:843)
at org.kframework.backend.java.kil.KItem.toString(KItem.java:822)
at com.google.common.base.Joiner.toString(Joiner.java:434)
at com.google.common.base.Joiner.appendTo(Joiner.java:111)
at com.google.common.base.Joiner.appendTo(Joiner.java:152)
at com.google.common.base.Joiner.appendTo(Joiner.java:140)
at org.kframework.backend.java.kil.KCollection.toString(KCollection.java:86)
at org.kframework.backend.java.kil.KItem.toStringImpl(KItem.java:843)
at org.kframework.backend.java.kil.KItem.toString(KItem.java:822)
at com.google.common.base.Joiner.toString(Joiner.java:434)
at com.google.common.base.Joiner.appendTo(Joiner.java:111)
at com.google.common.base.Joiner.appendTo(Joiner.java:152)
at com.google.common.base.Joiner.appendTo(Joiner.java:140)
at org.kframework.backend.java.kil.KCollection.toString(KCollection.java:86)
at org.kframework.backend.java.kil.KItem.toStringImpl(KItem.java:843)
at org.kframework.backend.java.kil.KItem.toString(KItem.java:822)
at com.google.common.base.Joiner.toString(Joiner.java:434)
at com.google.common.base.Joiner.appendTo(Joiner.java:111)
at com.google.common.base.Joiner.appendTo(Joiner.java:152)
at com.google.common.base.Joiner.appendTo(Joiner.java:140)
at org.kframework.backend.java.kil.KCollection.toString(KCollection.java:86)
at org.kframework.backend.java.kil.KItem.toStringImpl(KItem.java:843)
at org.kframework.backend.java.kil.KItem.toString(KItem.java:822)
at com.google.common.base.Joiner.toString(Joiner.java:434)
at com.google.common.base.Joiner.appendTo(Joiner.java:111)
at com.google.common.base.Joiner.appendTo(Joiner.java:152)
at com.google.common.base.Joiner.appendTo(Joiner.java:140)
at org.kframework.backend.java.kil.KCollection.toString(KCollection.java:86)
at org.kframework.backend.java.kil.KItem.toStringImpl(KItem.java:843)
at org.kframework.backend.java.kil.KItem.toString(KItem.java:822)
at org.kframework.backend.java.symbolic.ConjunctiveFormula.toString(ConjunctiveFormula.java:1043)
at org.kframework.backend.java.symbolic.SymbolicRewriter.proveRule(SymbolicRewriter.java:742)
at org.kframework.backend.java.symbolic.InitializeRewriter$SymbolicRewriterGlue.lambda$prove$2(InitializeRewriter.java:237)
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1374)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
at org.kframework.backend.java.symbolic.InitializeRewriter$SymbolicRewriterGlue.prove(InitializeRewriter.java:240)
at org.kframework.kprove.KProve.run(KProve.java:68)
at org.kframework.kprove.KProveFrontEnd.run(KProveFrontEnd.java:96)
at org.kframework.main.FrontEnd.main(FrontEnd.java:52)
at org.kframework.main.Main.runApplication(Main.java:118)
at org.kframework.main.Main.runApplication(Main.java:107)
at org.kframework.main.Main.main(Main.java:53)