private PsiNewExpression getPreviousAssignment(PsiLocalVariable variable, PsiStatement statement) {
    while (true) {
      statement = PsiTreeUtil.getPrevSiblingOfType(statement, PsiStatement.class);
      if (statement == null) return null;
      PsiExpression expression = ExpressionUtils.getAssignmentTo(statement, variable);
      if (isCollectionConstructor(expression)) {
        return (PsiNewExpression)expression;
      }
      if (VariableAccessUtils.variableIsUsed(variable, statement)) return null;
    }
  }
private PsiNewExpression getPreviousAssignment(PsiLocalVariable variable, PsiStatement statement)