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                      ]
                    }
                  ]
                },
                {
                  "class": "FunctionParameter",
                  "children": [
                    {
                      "class": "NameIdentifier",
                      "value": "to"
                    },
                    {
                      "class": "TypeReferenceNode",
                      "children": [
                        {
                          "class": "NameIdentifier",
                          "value": "Date"
                        }
                      ]
                    }
                  ]
                }
              ]
            },
            {
              "class": "FunctionCallNode",
              "children": [
                {
                  "class": "VariableReferenceNode",
                  "children": [
                    {
                      "class": "NameIdentifier",
                      "value": "native"
                    }
                  ]
                },
                {
                  "class": "FunctionCallParametersNode",
                  "children": [
                    {
                      "class": "StringNode",
                      "value": "system::daysBetween"
                    }
                  ]
                }
              ]
            },
            {
              "class": "TypeReferenceNode",
              "children": [
                {
                  "class": "NameIdentifier",
                  "value": "Number"
                }
              ]
            }
          ]
        }
      ]
    }
  ]
}