{
      "attributes": {
        "operator": "=",
        "type": "uint256"
      },
      "children": [
        {
          "attributes": {
            "type": "uint256"
          },
          "children": [
            {
              "attributes": {
                "type": "mapping(address => uint256)",
                "value": "c"
              },
              "id": 61,
              "name": "Identifier",
              "src": "873:1:0"
            },
            {
              "attributes": {
                "member_name": "sender",
                "type": "address"
              },
              "children": [
                {
                  "attributes": {
                    "type": "msg",
                    "value": "msg"
                  },
                  "id": 62,
                  "name": "Identifier",
                  "src": "875:3:0"
                }
              ],
              "id": 63,
              "name": "MemberAccess",
              "src": "875:10:0"
            }
          ],
          "id": 64,
          "name": "IndexAccess",
          "src": "873:13:0"
        },
        {
          "attributes": {
            "hexvalue": "30",
            "subdenomination": null,
            "token": null,
            "type": "int_const 0",
            "value": "0"
          },
          "id": 65,
          "name": "Literal",
          "src": "889:1:0"
        }
      ],
      "id": 66,
      "name": "Assignment",
      "src": "873:17:0"
    }