HeuristicMutationが条件式の再利用に対応していない

[tt-kuma]

問題

HeuristicMutationを利用する場合，再利用候補に条件式が存在するとClassCastExceptionでkgpが落ちる．

2020-12-02 16:19:42 [main] [ERROR] CUILauncher - class org.eclipse.jdt.core.dom.InfixExpression cannot be cast to class org.eclipse.jdt.core.dom.Statement (org.eclipse.jdt.core.dom.InfixExpression and org.eclipse.jdt.core.dom.Statement are in unnamed module of loader 'app')
java.lang.ClassCastException: class org.eclipse.jdt.core.dom.InfixExpression cannot be cast to class org.eclipse.jdt.core.dom.Statement (org.eclipse.jdt.core.dom.InfixExpression and org.eclipse.jdt.core.dom.Statement are in unnamed module of loader 'app')
	at jp.kusumotolab.kgenprog.ga.mutation.heuristic.OperationGenerator.chooseNodeForReuse(OperationGenerator.java:65)
	at jp.kusumotolab.kgenprog.ga.mutation.HeuristicMutation.makeOperation(HeuristicMutation.java:70)
	at jp.kusumotolab.kgenprog.ga.mutation.Mutation.makeBase(Mutation.java:93)
	at jp.kusumotolab.kgenprog.ga.mutation.Mutation.exec(Mutation.java:82)
	at jp.kusumotolab.kgenprog.KGenProgMain.run(KGenProgMain.java:113)
	at jp.kusumotolab.kgenprog.CUILauncher.launch(CUILauncher.java:72)
	at jp.kusumotolab.kgenprog.CUILauncher.main(CUILauncher.java:35)

原因

HeuristicMutationはHeuristicStatementSelectionにより再利用候補から文を選択している．
#710 により再利用候補に条件式が含まれるようになったが，HeuristicStatementSelectionが更新されていない．