---
Function {
 argument: Destructured {
  identifier: None,
  arguments: [
   DestructuredArgument {
    identifier: "config",
    default: None,
   },
   DestructuredArgument {
    identifier: "lib",
    default: None,
   },
   DestructuredArgument {
    identifier: "pkgs",
    default: None,
   },
  ],
  ellipsis: false,
 },
 definition: With {
  expression: Variable {
   identifier: "lib",
   position: (3, 6),
  },
  target: LetIn {
   bindings: [
    Binding {
     from: AttributePath {
      parts: [
       Raw {
        content: "cfg",
        position: (6, 3),
       },
      ],
     },
     to: PropertyAccess {
      expression: Variable {
       identifier: "config",
       position: (6, 9),
      },
      attribute_path: AttributePath {
       parts: [
        Raw {
         content: "systemd",
         position: (6, 16),
        },
       ],
      },
      default: None,
     },
    },
    Binding {
     from: AttributePath {
      parts: [
       Raw {
        content: "lndir",
        position: (7, 3),
       },
      ],
     },
     to: String {
      parts: [
       Interpolation {
        expression: PropertyAccess {
         expression: Variable {
          identifier: "pkgs",
          position: (7, 14),
         },
         attribute_path: AttributePath {
          parts: [
           Raw {
            content: "buildPackages",
            position: (7, 19),
           },
           Raw {
            content: "xorg",
            position: (7, 33),
           },
           Raw {
            content: "lndir",
            position: (7, 38),
           },
          ],
         },
         default: None,
        },
       },
       Raw {
        content: "/bin/lndir",
        position: (7, 44),
       },
      ],
      position: (7, 11),
     },
    },
    Binding {
     from: AttributePath {
      parts: [
       Raw {
        content: "systemd",
        position: (8, 3),
       },
      ],
     },
     to: PropertyAccess {
      expression: Variable {
       identifier: "cfg",
       position: (8, 13),
      },
      attribute_path: AttributePath {
       parts: [
        Raw {
         content: "package",
         position: (8, 17),
        },
       ],
      },
      default: None,
     },
    },
   ],
   target: Map {
    bindings: [
     Binding {
      from: AttributePath {
       parts: [
        Raw {
         content: "shellEscape",
         position: (11, 3),
        },
       ],
      },
      to: Function {
       argument: Simple {
        identifier: "s",
       },
       definition: Parentheses {
        expression: FunctionApplication {
         function: Variable {
          identifier: "replaceChars",
          position: (11, 21),
         },
         arguments: [
          List {
           elements: [
            String {
             parts: [
              Raw {
               content: "\\",
               position: (11, 37),
              },
             ],
             position: (11, 36),
            },
           ],
           position: (11, 34),
          },
          List {
           elements: [
            String {
             parts: [
              Raw {
               content: "\\\\",
               position: (11, 46),
              },
             ],
             position: (11, 45),
            },
           ],
           position: (11, 43),
          },
          Variable {
           identifier: "s",
           position: (11, 54),
          },
         ],
        },
        position: (11, 20),
       },
       position: (11, 17),
      },
     },
     Binding {
      from: AttributePath {
       parts: [
        Raw {
         content: "mkPathSafeName",
         position: (13, 3),
        },
       ],
      },
      to: FunctionApplication {
       function: PropertyAccess {
        expression: Variable {
         identifier: "lib",
         position: (13, 20),
        },
        attribute_path: AttributePath {
         parts: [
          Raw {
           content: "replaceChars",
           position: (13, 24),
          },
         ],
        },
        default: None,
       },
       arguments: [
        List {
         elements: [
          String {
           parts: [
            Raw {
             content: "@",
             position: (13, 39),
            },
           ],
           position: (13, 38),
          },
          String {
           parts: [
            Raw {
             content: ":",
             position: (13, 43),
            },
           ],
           position: (13, 42),
          },
          String {
           parts: [
            Raw {
             content: "\\",
             position: (13, 47),
            },
           ],
           position: (13, 46),
          },
          String {
           parts: [
            Raw {
             content: "[",
             position: (13, 52),
            },
           ],
           position: (13, 51),
          },
          String {
           parts: [
            Raw {
             content: "]",
             position: (13, 56),
            },
           ],
           position: (13, 55),
          },
         ],
         position: (13, 37),
        },
        List {
         elements: [
          String {
           parts: [
            Raw {
             content: "-",
             position: (13, 62),
            },
           ],
           position: (13, 61),
          },
          String {
           parts: [
            Raw {
             content: "-",
             position: (13, 66),
            },
           ],
           position: (13, 65),
          },
          String {
           parts: [
            Raw {
             content: "-",
             position: (13, 70),
            },
           ],
           position: (13, 69),
          },
          String {
           parts: [],
           position: (13, 73),
          },
          String {
           parts: [],
           position: (13, 76),
          },
         ],
         position: (13, 60),
        },
       ],
      },
     },
     Binding {
      from: AttributePath {
       parts: [
        Raw {
         content: "unitNameType",
         position: (16, 3),
        },
       ],
      },
      to: FunctionApplication {
       function: PropertyAccess {
        expression: Variable {
         identifier: "types",
         position: (16, 18),
        },
        attribute_path: AttributePath {
         parts: [
          Raw {
           content: "strMatching",
           position: (16, 24),
          },
         ],
        },
        default: None,
       },
       arguments: [
        String {
         parts: [
          Raw {
           content: "[a-zA-Z0-9@%:_.\\-]+[.](service|socket|device|mount|automount|swap|target|path|timer|scope|slice)",
           position: (16, 37),
          },
         ],
         position: (16, 36),
        },
       ],
      },
     },
     Binding {
      from: AttributePath {
       parts: [
        Raw {
         content: "makeUnit",
         position: (18, 3),
        },
       ],
      },
      to: Function {
       argument: Simple {
        identifier: "name",
       },
       definition: Function {
        argument: Simple {
         identifier: "unit",
        },
        definition: IfThenElse {
         predicate: PropertyAccess {
          expression: Variable {
           identifier: "unit",
           position: (19, 8),
          },
          attribute_path: AttributePath {
           parts: [
            Raw {
             content: "enable",
             position: (19, 13),
            },
           ],
          },
          default: None,
         },
         then: FunctionApplication {
          function: PropertyAccess {
           expression: Variable {
            identifier: "pkgs",
            position: (20, 7),
           },
           attribute_path: AttributePath {
            parts: [
             Raw {
              content: "runCommand",
              position: (20, 12),
             },
            ],
           },
           default: None,
          },
          arguments: [
           String {
            parts: [
             Raw {
              content: "unit-",
              position: (20, 24),
             },
             Interpolation {
              expression: FunctionApplication {
               function: Variable {
                identifier: "mkPathSafeName",
                position: (20, 31),
               },
               arguments: [
                Variable {
                 identifier: "name",
                 position: (20, 46),
                },
               ],
              },
             },
            ],
            position: (20, 23),
           },
           Map {
            bindings: [
             Binding {
              from: AttributePath {
               parts: [
                Raw {
                 content: "preferLocalBuild",
                 position: (21, 11),
                },
               ],
              },
              to: Variable {
               identifier: "true",
               position: (21, 30),
              },
             },
             Binding {
              from: AttributePath {
               parts: [
                Raw {
                 content: "allowSubstitutes",
                 position: (22, 11),
                },
               ],
              },
              to: Variable {
               identifier: "false",
               position: (22, 30),
              },
             },
             Inherit {
              from: Some(
               Variable {
                identifier: "unit",
                position: (23, 20),
               },
              ),
              attributes: [
               Raw {
                content: "text",
                position: (23, 26),
               },
              ],
             },
            ],
            recursive: false,
            position: (21, 9),
           },
           String {
            parts: [
             Raw {
              content: "name=",
              position: (26, 1),
             },
             Interpolation {
              expression: FunctionApplication {
               function: Variable {
                identifier: "shellEscape",
                position: (26, 18),
               },
               arguments: [
                Variable {
                 identifier: "name",
                 position: (26, 30),
                },
               ],
              },
             },
             Raw {
              content: "\nmkdir -p \"$out/$(dirname \"$name\")\"\necho -n \"$text\" > \"$out/$name\"\n",
              position: (26, 35),
             },
            ],
            position: (25, 9),
           },
          ],
         },
         else_: FunctionApplication {
          function: PropertyAccess {
           expression: Variable {
            identifier: "pkgs",
            position: (31, 7),
           },
           attribute_path: AttributePath {
            parts: [
             Raw {
              content: "runCommand",
              position: (31, 12),
             },
            ],
           },
           default: None,
          },
          arguments: [
           String {
            parts: [
             Raw {
              content: "unit-",
              position: (31, 24),
             },
             Interpolation {
              expression: FunctionApplication {
               function: Variable {
                identifier: "mkPathSafeName",
                position: (31, 31),
               },
               arguments: [
                Variable {
                 identifier: "name",
                 position: (31, 46),
                },
               ],
              },
             },
             Raw {
              content: "-disabled",
              position: (31, 51),
             },
            ],
            position: (31, 23),
           },
           Map {
            bindings: [
             Binding {
              from: AttributePath {
               parts: [
                Raw {
                 content: "preferLocalBuild",
                 position: (32, 11),
                },
               ],
              },
              to: Variable {
               identifier: "true",
               position: (32, 30),
              },
             },
             Binding {
              from: AttributePath {
               parts: [
                Raw {
                 content: "allowSubstitutes",
                 position: (33, 11),
                },
               ],
              },
              to: Variable {
               identifier: "false",
               position: (33, 30),
              },
             },
            ],
            recursive: false,
            position: (32, 9),
           },
           String {
            parts: [
             Raw {
              content: "name=",
              position: (36, 1),
             },
             Interpolation {
              expression: FunctionApplication {
               function: Variable {
                identifier: "shellEscape",
                position: (36, 18),
               },
               arguments: [
                Variable {
                 identifier: "name",
                 position: (36, 30),
                },
               ],
              },
             },
             Raw {
              content: "\nmkdir -p \"$out/$(dirname \"$name\")\"\nln -s /dev/null \"$out/$name\"\n",
              position: (36, 35),
             },
            ],
            position: (35, 9),
           },
          ],
         },
         position: (19, 5),
        },
        position: (18, 20),
       },
       position: (18, 14),
      },
     },
     Binding {
      from: AttributePath {
       parts: [
        Raw {
         content: "boolValues",
         position: (41, 3),
        },
       ],
      },
      to: List {
       elements: [
        Variable {
         identifier: "true",
         position: (41, 17),
        },
        Variable {
         identifier: "false",
         position: (41, 22),
        },
        String {
         parts: [
          Raw {
           content: "yes",
           position: (41, 29),
          },
         ],
         position: (41, 28),
        },
        String {
         parts: [
          Raw {
           content: "no",
           position: (41, 35),
          },
         ],
         position: (41, 34),
        },
       ],
       position: (41, 16),
      },
     },
     Binding {
      from: AttributePath {
       parts: [
        Raw {
         content: "digits",
         position: (43, 3),
        },
       ],
      },
      to: FunctionApplication {
       function: Variable {
        identifier: "map",
        position: (43, 12),
       },
       arguments: [
        Variable {
         identifier: "toString",
         position: (43, 16),
        },
        Parentheses {
         expression: FunctionApplication {
          function: Variable {
           identifier: "range",
           position: (43, 26),
          },
          arguments: [
           Int {
            value: 0,
            position: (43, 32),
           },
           Int {
            value: 9,
            position: (43, 34),
           },
          ],
         },
         position: (43, 25),
        },
       ],
      },
     },
     Binding {
      from: AttributePath {
       parts: [
        Raw {
         content: "isByteFormat",
         position: (45, 3),
        },
       ],
      },
      to: Function {
       argument: Simple {
        identifier: "s",
       },
       definition: LetIn {
        bindings: [
         Binding {
          from: AttributePath {
           parts: [
            Raw {
             content: "l",
             position: (47, 7),
            },
           ],
          },
          to: FunctionApplication {
           function: Variable {
            identifier: "reverseList",
            position: (47, 11),
           },
           arguments: [
            Parentheses {
             expression: FunctionApplication {
              function: Variable {
               identifier: "stringToCharacters",
               position: (47, 24),
              },
              arguments: [
               Variable {
                identifier: "s",
                position: (47, 43),
               },
              ],
             },
             position: (47, 23),
            },
           ],
          },
         },
         Binding {
          from: AttributePath {
           parts: [
            Raw {
             content: "suffix",
             position: (48, 7),
            },
           ],
          },
          to: FunctionApplication {
           function: Variable {
            identifier: "head",
            position: (48, 16),
           },
           arguments: [
            Variable {
             identifier: "l",
             position: (48, 21),
            },
           ],
          },
         },
         Binding {
          from: AttributePath {
           parts: [
            Raw {
             content: "nums",
             position: (49, 7),
            },
           ],
          },
          to: FunctionApplication {
           function: Variable {
            identifier: "tail",
            position: (49, 14),
           },
           arguments: [
            Variable {
             identifier: "l",
             position: (49, 19),
            },
           ],
          },
         },
        ],
        target: BinaryOperation {
         operator: LogicalAnd,
         operands: [
          FunctionApplication {
           function: Variable {
            identifier: "elem",
            position: (50, 8),
           },
           arguments: [
            Variable {
             identifier: "suffix",
             position: (50, 13),
            },
            Parentheses {
             expression: BinaryOperation {
              operator: Concatenation,
              operands: [
               List {
                elements: [
                 String {
                  parts: [
                   Raw {
                    content: "K",
                    position: (50, 23),
                   },
                  ],
                  position: (50, 22),
                 },
                 String {
                  parts: [
                   Raw {
                    content: "M",
                    position: (50, 27),
                   },
                  ],
                  position: (50, 26),
                 },
                 String {
                  parts: [
                   Raw {
                    content: "G",
                    position: (50, 31),
                   },
                  ],
                  position: (50, 30),
                 },
                 String {
                  parts: [
                   Raw {
                    content: "T",
                    position: (50, 35),
                   },
                  ],
                  position: (50, 34),
                 },
                ],
                position: (50, 21),
               },
               Variable {
                identifier: "digits",
                position: (50, 42),
               },
              ],
              position: (50, 39),
             },
             position: (50, 20),
            },
           ],
          },
          FunctionApplication {
           function: Variable {
            identifier: "all",
            position: (51, 10),
           },
           arguments: [
            Parentheses {
             expression: Function {
              argument: Simple {
               identifier: "num",
              },
              definition: FunctionApplication {
               function: Variable {
                identifier: "elem",
                position: (51, 20),
               },
               arguments: [
                Variable {
                 identifier: "num",
                 position: (51, 25),
                },
                Variable {
                 identifier: "digits",
                 position: (51, 29),
                },
               ],
              },
              position: (51, 15),
             },
             position: (51, 14),
            },
            Variable {
             identifier: "nums",
             position: (51, 37),
            },
           ],
          },
         ],
         position: (51, 7),
        },
        position: (46, 5),
       },
       position: (45, 18),
      },
     },
     Binding {
      from: AttributePath {
       parts: [
        Raw {
         content: "assertByteFormat",
         position: (53, 3),
        },
       ],
      },
      to: Function {
       argument: Simple {
        identifier: "name",
       },
       definition: Function {
        argument: Simple {
         identifier: "group",
        },
        definition: Function {
         argument: Simple {
          identifier: "attr",
         },
         definition: FunctionApplication {
          function: Variable {
           identifier: "optional",
           position: (54, 5),
          },
          arguments: [
           Parentheses {
            expression: BinaryOperation {
             operator: LogicalAnd,
             operands: [
              HasProperty {
               expression: Variable {
                identifier: "attr",
                position: (54, 15),
               },
               attribute_path: AttributePath {
                parts: [
                 Interpolation {
                  expression: Variable {
                   identifier: "name",
                   position: (54, 24),
                  },
                 },
                ],
               },
               position: (54, 20),
              },
              UnaryOperation {
               operator: Not,
               operand: FunctionApplication {
                function: Variable {
                 identifier: "isByteFormat",
                 position: (54, 35),
                },
                arguments: [
                 PropertyAccess {
                  expression: Variable {
                   identifier: "attr",
                   position: (54, 48),
                  },
                  attribute_path: AttributePath {
                   parts: [
                    Interpolation {
                     expression: Variable {
                      identifier: "name",
                      position: (54, 55),
                     },
                    },
                   ],
                  },
                  default: None,
                 },
                ],
               },
               position: (54, 33),
              },
             ],
             position: (54, 30),
            },
            position: (54, 14),
           },
           String {
            parts: [
             Raw {
              content: "Systemd ",
              position: (55, 8),
             },
             Interpolation {
              expression: Variable {
               identifier: "group",
               position: (55, 18),
              },
             },
             Raw {
              content: " field `",
              position: (55, 24),
             },
             Interpolation {
              expression: Variable {
               identifier: "name",
               position: (55, 34),
              },
             },
             Raw {
              content: "' must be in byte format [0-9]+[KMGT].",
              position: (55, 39),
             },
            ],
            position: (55, 7),
           },
          ],
         },
         position: (53, 35),
        },
        position: (53, 28),
       },
       position: (53, 22),
      },
     },
     Binding {
      from: AttributePath {
       parts: [
        Raw {
         content: "hexChars",
         position: (57, 3),
        },
       ],
      },
      to: FunctionApplication {
       function: Variable {
        identifier: "stringToCharacters",
        position: (57, 14),
       },
       arguments: [
        String {
         parts: [
          Raw {
           content: "0123456789abcdefABCDEF",
           position: (57, 34),
          },
         ],
         position: (57, 33),
        },
       ],
      },
     },
     Binding {
      from: AttributePath {
       parts: [
        Raw {
         content: "isMacAddress",
         position: (59, 3),
        },
       ],
      },
      to: Function {
       argument: Simple {
        identifier: "s",
       },
       definition: BinaryOperation {
        operator: LogicalAnd,
        operands: [
         BinaryOperation {
          operator: EqualTo,
          operands: [
           FunctionApplication {
            function: Variable {
             identifier: "stringLength",
             position: (59, 21),
            },
            arguments: [
             Variable {
              identifier: "s",
              position: (59, 34),
             },
            ],
           },
           Int {
            value: 17,
            position: (59, 39),
           },
          ],
          position: (59, 36),
         },
         FunctionApplication {
          function: Variable {
           identifier: "flip",
           position: (60, 8),
          },
          arguments: [
           Variable {
            identifier: "all",
            position: (60, 13),
           },
           Parentheses {
            expression: FunctionApplication {
             function: Variable {
              identifier: "splitString",
              position: (60, 18),
             },
             arguments: [
              String {
               parts: [
                Raw {
                 content: ":",
                 position: (60, 31),
                },
               ],
               position: (60, 30),
              },
              Variable {
               identifier: "s",
               position: (60, 34),
              },
             ],
            },
            position: (60, 17),
           },
           Parentheses {
            expression: Function {
             argument: Simple {
              identifier: "bytes",
             },
             definition: FunctionApplication {
              function: Variable {
               identifier: "all",
               position: (61, 7),
              },
              arguments: [
               Parentheses {
                expression: Function {
                 argument: Simple {
                  identifier: "byte",
                 },
                 definition: FunctionApplication {
                  function: Variable {
                   identifier: "elem",
                   position: (61, 18),
                  },
                  arguments: [
                   Variable {
                    identifier: "byte",
                    position: (61, 23),
                   },
                   Variable {
                    identifier: "hexChars",
                    position: (61, 28),
                   },
                  ],
                 },
                 position: (61, 12),
                },
                position: (61, 11),
               },
               Parentheses {
                expression: FunctionApplication {
                 function: Variable {
                  identifier: "stringToCharacters",
                  position: (61, 39),
                 },
                 arguments: [
                  Variable {
                   identifier: "bytes",
                   position: (61, 58),
                  },
                 ],
                },
                position: (61, 38),
               },
              ],
             },
             position: (60, 38),
            },
            position: (60, 37),
           },
          ],
         },
        ],
        position: (60, 5),
       },
       position: (59, 18),
      },
     },
     Binding {
      from: AttributePath {
       parts: [
        Raw {
         content: "assertMacAddress",
         position: (64, 3),
        },
       ],
      },
      to: Function {
       argument: Simple {
        identifier: "name",
       },
       definition: Function {
        argument: Simple {
         identifier: "group",
        },
        definition: Function {
         argument: Simple {
          identifier: "attr",
         },
         definition: FunctionApplication {
          function: Variable {
           identifier: "optional",
           position: (65, 5),
          },
          arguments: [
           Parentheses {
            expression: BinaryOperation {
             operator: LogicalAnd,
             operands: [
              HasProperty {
               expression: Variable {
                identifier: "attr",
                position: (65, 15),
               },
               attribute_path: AttributePath {
                parts: [
                 Interpolation {
                  expression: Variable {
                   identifier: "name",
                   position: (65, 24),
                  },
                 },
                ],
               },
               position: (65, 20),
              },
              UnaryOperation {
               operator: Not,
               operand: FunctionApplication {
                function: Variable {
                 identifier: "isMacAddress",
                 position: (65, 35),
                },
                arguments: [
                 PropertyAccess {
                  expression: Variable {
                   identifier: "attr",
                   position: (65, 48),
                  },
                  attribute_path: AttributePath {
                   parts: [
                    Interpolation {
                     expression: Variable {
                      identifier: "name",
                      position: (65, 55),
                     },
                    },
                   ],
                  },
                  default: None,
                 },
                ],
               },
               position: (65, 33),
              },
             ],
             position: (65, 30),
            },
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                       String {
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                       position: (105, 42),
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                      attribute_path: AttributePath {
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                         position: (105, 44),
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                       ],
                      },
                      default: None,
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                     else_: Variable {
                      identifier: "v",
                      position: (106, 12),
                     },
                     position: (105, 12),
                    },
                    position: (104, 7),
                   },
                   position: (103, 29),
                  },
                  position: (103, 28),
                 },
                ],
               },
               position: (103, 21),
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              Variable {
               identifier: "attrs",
               position: (107, 8),
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             ],
            },
           },
           Binding {
            from: AttributePath {
             parts: [
              Raw {
               content: "errors",
               position: (108, 5),
              },
             ],
            },
            to: FunctionApplication {
             function: Variable {
              identifier: "concatMap",
              position: (108, 14),
             },
             arguments: [
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               expression: Function {
                argument: Simple {
                 identifier: "c",
                },
                definition: FunctionApplication {
                 function: Variable {
                  identifier: "c",
                  position: (108, 28),
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                 arguments: [
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                   identifier: "group",
                   position: (108, 30),
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                  Variable {
                   identifier: "defs",
                   position: (108, 36),
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                 ],
                },
                position: (108, 25),
               },
               position: (108, 24),
              },
              Variable {
               identifier: "checks",
               position: (108, 42),
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            },
           },
          ],
          target: IfThenElse {
           predicate: BinaryOperation {
            operator: EqualTo,
            operands: [
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              identifier: "errors",
              position: (109, 9),
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             List {
              elements: [],
              position: (109, 19),
             },
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            position: (109, 16),
           },
           then: Variable {
            identifier: "true",
            position: (109, 27),
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           else_: FunctionApplication {
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             expression: Variable {
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              position: (110, 11),
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             attribute_path: AttributePath {
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                content: "trace",
                position: (110, 20),
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             default: None,
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            arguments: [
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              expression: FunctionApplication {
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                identifier: "concatStringsSep",
                position: (110, 27),
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               arguments: [
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                 parts: [
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                   content: "\n",
                   position: (110, 45),
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                 position: (110, 44),
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                Variable {
                 identifier: "errors",
                 position: (110, 49),
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              },
              position: (110, 26),
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             Variable {
              identifier: "false",
              position: (110, 57),
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           position: (109, 6),
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          position: (99, 43),
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         position: (99, 36),
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        position: (99, 28),
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       position: (99, 21),
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     Binding {
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       parts: [
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         content: "toOption",
         position: (112, 3),
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      to: Function {
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       definition: IfThenElse {
        predicate: BinaryOperation {
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           position: (113, 8),
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          position: (114, 15),
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         then: String {
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          position: (114, 29),
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         else_: FunctionApplication {
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           identifier: "toString",
           position: (115, 10),
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          arguments: [
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         position: (114, 10),
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        position: (113, 5),
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       position: (112, 14),
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     Binding {
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       parts: [
        Raw {
         content: "attrsToSection",
         position: (117, 3),
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      to: Function {
       argument: Simple {
        identifier: "as",
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       definition: FunctionApplication {
        function: Variable {
         identifier: "concatStrings",
         position: (118, 5),
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        arguments: [
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          expression: FunctionApplication {
           function: Variable {
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            position: (118, 20),
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           arguments: [
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             expression: FunctionApplication {
              function: Variable {
               identifier: "mapAttrsToList",
               position: (118, 33),
              },
              arguments: [
               Parentheses {
                expression: Function {
                 argument: Simple {
                  identifier: "name",
                 },
                 definition: Function {
                  argument: Simple {
                   identifier: "value",
                  },
                  definition: FunctionApplication {
                   function: Variable {
                    identifier: "map",
                    position: (119, 7),
                   },
                   arguments: [
                    Parentheses {
                     expression: Function {
                      argument: Simple {
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                      definition: String {
                       parts: [
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                         content: "",
                         position: (120, 1),
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                        Interpolation {
                         expression: Variable {
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                          position: (120, 13),
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                        },
                        Raw {
                         content: "=",
                         position: (120, 18),
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                        Interpolation {
                         expression: FunctionApplication {
                          function: Variable {
                           identifier: "toOption",
                           position: (120, 21),
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                          arguments: [
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                            position: (120, 30),
                           },
                          ],
                         },
                        },
                        Raw {
                         content: "\n",
                         position: (120, 32),
                        },
                       ],
                       position: (119, 15),
                      },
                      position: (119, 12),
                     },
                     position: (119, 11),
                    },
                    Parentheses {
                     expression: IfThenElse {
                      predicate: FunctionApplication {
                       function: Variable {
                        identifier: "isList",
                        position: (122, 13),
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                       arguments: [
                        Variable {
                         identifier: "value",
                         position: (122, 20),
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                       ],
                      },
                      then: Variable {
                       identifier: "value",
                       position: (122, 31),
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                      else_: List {
                       elements: [
                        Variable {
                         identifier: "value",
                         position: (122, 43),
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                       ],
                       position: (122, 42),
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                      position: (122, 10),
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                     position: (122, 9),
                    },
                   ],
                  },
                  position: (118, 55),
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                 position: (118, 49),
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                position: (118, 48),
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               Variable {
                identifier: "as",
                position: (123, 9),
               },
              ],
             },
             position: (118, 32),
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          },
          position: (118, 19),
         },
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       position: (117, 20),
      },
     },
     Binding {
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       parts: [
        Raw {
         content: "generateUnits",
         position: (125, 3),
        },
       ],
      },
      to: Function {
       argument: Destructured {
        identifier: None,
        arguments: [
         DestructuredArgument {
          identifier: "allowCollisions",
          default: Some(
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            position: (125, 39),
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          ),
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         DestructuredArgument {
          identifier: "type",
          default: None,
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         DestructuredArgument {
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          default: None,
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         DestructuredArgument {
          identifier: "upstreamUnits",
          default: None,
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         DestructuredArgument {
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         DestructuredArgument {
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          default: Some(
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            expression: Variable {
             identifier: "cfg",
             position: (125, 99),
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             parts: [
              Raw {
               content: "packages",
               position: (125, 103),
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            default: None,
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         DestructuredArgument {
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          default: Some(
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             position: (125, 123),
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            attribute_path: AttributePath {
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               position: (125, 127),
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            default: None,
           },
          ),
         },
        ],
        ellipsis: false,
       },
       definition: LetIn {
        bindings: [
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          from: AttributePath {
           parts: [
            Raw {
             content: "typeDir",
             position: (127, 7),
            },
           ],
          },
          to: PropertyAccess {
           expression: Parentheses {
            expression: Map {
             bindings: [
              Binding {
               from: AttributePath {
                parts: [
                 Raw {
                  content: "system",
                  position: (128, 9),
                 },
                ],
               },
               to: String {
                parts: [
                 Raw {
                  content: "system",
                  position: (128, 19),
                 },
                ],
                position: (128, 18),
               },
              },
              Binding {
               from: AttributePath {
                parts: [
                 Raw {
                  content: "initrd",
                  position: (129, 9),
                 },
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               },
               to: String {
                parts: [
                 Raw {
                  content: "system",
                  position: (129, 19),
                 },
                ],
                position: (129, 18),
               },
              },
              Binding {
               from: AttributePath {
                parts: [
                 Raw {
                  content: "user",
                  position: (130, 9),
                 },
                ],
               },
               to: String {
                parts: [
                 Raw {
                  content: "user",
                  position: (130, 17),
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                ],
                position: (130, 16),
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              },
              Binding {
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                parts: [
                 Raw {
                  content: "nspawn",
                  position: (131, 9),
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               to: String {
                parts: [
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                  content: "nspawn",
                  position: (131, 19),
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                ],
                position: (131, 18),
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              },
             ],
             recursive: false,
             position: (127, 18),
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            position: (127, 17),
           },
           attribute_path: AttributePath {
            parts: [
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              expression: Variable {
               identifier: "type",
               position: (132, 12),
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             },
            ],
           },
           default: None,
          },
         },
        ],
        target: FunctionApplication {
         function: PropertyAccess {
          expression: Variable {
           identifier: "pkgs",
           position: (133, 8),
          },
          attribute_path: AttributePath {
           parts: [
            Raw {
             content: "runCommand",
             position: (133, 13),
            },
           ],
          },
          default: None,
         },
         arguments: [
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           parts: [
            Interpolation {
             expression: Variable {
              identifier: "type",
              position: (133, 27),
             },
            },
            Raw {
             content: "-units",
             position: (133, 32),
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           ],
           position: (133, 24),
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          Map {
           bindings: [
            Binding {
             from: AttributePath {
              parts: [
               Raw {
                content: "preferLocalBuild",
                position: (134, 9),
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             to: Variable {
              identifier: "true",
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            },
            Binding {
             from: AttributePath {
              parts: [
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                content: "allowSubstitutes",
                position: (135, 9),
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             },
             to: Variable {
              identifier: "false",
              position: (135, 28),
             },
            },
           ],
           recursive: false,
           position: (134, 7),
          },
          String {
           parts: [
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             content: "mkdir -p $out\n\n# Copy the upstream systemd units we're interested in.\nfor i in ",
             position: (137, 1),
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            Interpolation {
             expression: FunctionApplication {
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               identifier: "toString",
               position: (140, 18),
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             },
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            Raw {
             content: "; do\n  fn=",
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            Interpolation {
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            Interpolation {
             expression: Variable {
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             position: (141, 49),
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            Raw {
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             position: (145, 16),
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            Raw {
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             position: (145, 19),
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            Interpolation {
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             expression: Variable {
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             position: (158, 22),
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             expression: Variable {
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            Raw {
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             position: (170, 37),
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             content: "$",
             position: (176, 16),
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             expression: FunctionApplication {
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                   position: (194, 43),
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            Raw {
             content: "; do\n  fn=$(basename $i/*)\n  if [ -e $out/$fn ]; then\n    if [ \"$(readlink -f $i/$fn)\" = /dev/null ]; then\n      ln -sfn /dev/null $out/$fn\n    else\n      ",
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              position: (200, 15),
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                            expression: Variable {
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                          position: (215, 36),
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                         position: (215, 29),
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                        position: (215, 28),
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                       PropertyAccess {
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                           position: (217, 20),
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                        default: None,
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                     },
                     position: (214, 46),
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                    position: (214, 40),
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                   position: (214, 39),
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                  Variable {
                   identifier: "units",
                   position: (217, 29),
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                 ],
                },
                position: (214, 23),
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              ],
             },
            },
            Raw {
             content: "\n\n# Create .wants and .requires symlinks from the wantedBy and\n# requiredBy options.\n",
             position: (217, 36),
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            Interpolation {
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              function: Variable {
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               position: (221, 9),
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                  position: (221, 24),
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                 arguments: [
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                   expression: Function {
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                     definition: FunctionApplication {
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                       position: (222, 11),
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                        expression: Function {
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                         definition: String {
                          parts: [
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                            position: (223, 1),
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                            position: (223, 27),
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                           Interpolation {
                            expression: Variable {
                             identifier: "name2",
                             position: (223, 30),
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                           },
                           Raw {
                            content: ".wants'\nln -sfn '../",
                            position: (223, 36),
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                           Interpolation {
                            expression: Variable {
                             identifier: "name",
                             position: (224, 27),
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                           },
                           Raw {
                            content: "' $out/",
                            position: (224, 32),
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                           Raw {
                            content: "'",
                            position: (224, 39),
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                           Interpolation {
                            expression: Variable {
                             identifier: "name2",
                             position: (224, 42),
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                           },
                           Raw {
                            content: ".wants'/\n",
                            position: (224, 48),
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                          position: (222, 36),
                         },
                         position: (222, 29),
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                        position: (222, 28),
                       },
                       PropertyAccess {
                        expression: Variable {
                         identifier: "unit",
                         position: (225, 15),
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                        attribute_path: AttributePath {
                         parts: [
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                           content: "wantedBy",
                           position: (225, 20),
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