Illegal state exception (duplicate key) on Apache commons-collections #139

Caused by: java.lang.IllegalStateException: Duplicate key copy(T[]) (attempted merging values Callable(filePath=.../commons-collections/src/main/java/org/apache/commons/collections4/functors/FunctorUtils.java, signature=copy(T[]), comments=[Comment(content=
     * Clones the consumers to ensure that the internal references can't be updated.
     *
     * @param consumers  the consumers to copy.
     * @return the cloned consumers.
     , startLine=81, endLine=86, startColumn=5, endColumn=7, isJavadoc=true)], annotations=[@SuppressWarnings("unchecked")], modifiers=[static], thrownExceptions=[], declaration=static T[] copy(final T... consumers), parameters=[ParameterInCallable(type=T, name=consumers, annotations=[], modifiers=[final], startLine=88, endLine=88, startColumn=45, endColumn=64)], code={
        return clone(consumers);
    }, startLine=87, endLine=90, codeStartLine=88, returnType=T[], isImplicit=false, isConstructor=false, referencedTypes=[], accessedFields=[], callSites=[CallSite(methodName=clone, comment=null, receiverExpr=, receiverType=, argumentTypes=[], argumentExpr=[consumers], returnType=, calleeSignature=clone(java.lang.Object[]), isPublic=false, isProtected=false, isPrivate=true, isUnspecified=false, isStaticCall=false, isConstructorCall=false, crudOperation=null, crudQuery=null, startLine=89, startColumn=16, endLine=89, endColumn=31)], variableDeclarations=[], crudOperations=[], crudQueries=[], cyclomaticComplexity=1, isEntrypoint=false) and Callable(filePath=.../commons-collections/src/main/java/org/apache/commons/collections4/functors/FunctorUtils.java, signature=copy(T[]), comments=[Comment(content=
     * Clone the predicates to ensure that the internal reference can't be messed with.
     * Due to the {@link Predicate#test(T)} method, Predicate<? super T> is
     * able to be coerced to Predicate<T> without casting issues.
     *
     * @param predicates  the predicates to copy
     * @return the cloned predicates
     , startLine=92, endLine=99, startColumn=5, endColumn=7, isJavadoc=true)], annotations=[@SuppressWarnings("unchecked")], modifiers=[static], thrownExceptions=[], declaration=static T[] copy(final T... predicates), parameters=[ParameterInCallable(type=T, name=predicates, annotations=[], modifiers=[final], startLine=101, endLine=101, startColumn=65, endColumn=85)], code={
        return clone(predicates);
    }, startLine=100, endLine=103, codeStartLine=101, returnType=T[], isImplicit=false, isConstructor=false, referencedTypes=[], accessedFields=[], callSites=[CallSite(methodName=clone, comment=null, receiverExpr=, receiverType=, argumentTypes=[], argumentExpr=[predicates], returnType=, calleeSignature=clone(java.lang.Object[]), isPublic=false, isProtected=false, isPrivate=true, isUnspecified=false, isStaticCall=false, isConstructorCall=false, crudOperation=null, crudQuery=null, startLine=102, startColumn=16, endLine=102, endColumn=32)], variableDeclarations=[], crudOperations=[], crudQueries=[], cyclomaticComplexity=1, isEntrypoint=false))
	at java.base/java.util.stream.Collectors.duplicateKeyException(Collectors.java:135)
	at java.base/java.util.stream.Collectors.lambda$uniqKeysMapAccumulator$1(Collectors.java:182)
	at java.base/java.util.stream.ReduceOps$3ReducingSink.accept(ReduceOps.java:169)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
	at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179)
	at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1708)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
	at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682)
	at com.ibm.cldk.SymbolTable.lambda$processCompilationUnit$23(SymbolTable.java:283)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
	at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179)
	at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1708)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
	at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682)
	at com.ibm.cldk.SymbolTable.processCompilationUnit(SymbolTable.java:290)
	at com.ibm.cldk.SymbolTable.extractAll(SymbolTable.java:1166)
	at com.ibm.cldk.CodeAnalyzer.analyze(CodeAnalyzer.java:196)
	at com.ibm.cldk.CodeAnalyzer.run(CodeAnalyzer.java:119)