@NotNull private static PsiSubstitutor replaceVariables(Collection<InferenceVariable> inferenceVariables) { final List<InferenceVariable> targetVars = new ArrayList<InferenceVariable>(); PsiSubstitutor substitutor = PsiSubstitutor.EMPTY; final InferenceVariable[] oldVars = inferenceVariables.toArray(new InferenceVariable[inferenceVariables.size()]); for (InferenceVariable variable : oldVars) { final InferenceVariable newVariable = new InferenceVariable( variable.getCallContext(), variable.getParameter(), variable.getName()); substitutor = substitutor.put( variable, JavaPsiFacade.getElementFactory(variable.getProject()).createType(newVariable)); targetVars.add(newVariable); if (variable.isThrownBound()) { newVariable.setThrownBound(); } } for (int i = 0; i < targetVars.size(); i++) { InferenceVariable var = targetVars.get(i); for (InferenceBound boundType : InferenceBound.values()) { for (PsiType bound : oldVars[i].getBounds(boundType)) { var.addBound(substitutor.substitute(bound), boundType, null); } } } return substitutor; }