protected void checkParametersConflicts(MultiMap<PsiElement, String> conflicts) {
    Set<String> usedNames = new HashSet<>();
    for (VariableData data : myInputVariables) {
      if (data.passAsParameter && !usedNames.add(data.name)) {
        conflicts.putValue(null, JavaRefactoringBundle.message("extract.method.conflict.parameter", data.name));
      }
    }
  }
protected void checkParametersConflicts(MultiMap<PsiElement, String> conflicts)