---
Function {
 argument: Destructured {
  identifier: None,
  arguments: [
   DestructuredArgument {
    identifier: "config",
    default: None,
   },
   DestructuredArgument {
    identifier: "pkgs",
    default: None,
   },
   DestructuredArgument {
    identifier: "lib",
    default: None,
   },
  ],
  ellipsis: true,
 },
 definition: LetIn {
  bindings: [
   Binding {
    from: AttributePath {
     parts: [
      Raw {
       content: "cfg",
       position: (3, 3),
      },
     ],
    },
    to: PropertyAccess {
     expression: Variable {
      identifier: "config",
      position: (3, 9),
     },
     attribute_path: AttributePath {
      parts: [
       Raw {
        content: "services",
        position: (3, 16),
       },
       Raw {
        content: "btrbk",
        position: (3, 25),
       },
      ],
     },
     default: None,
    },
   },
   Binding {
    from: AttributePath {
     parts: [
      Raw {
       content: "sshEnabled",
       position: (4, 3),
      },
     ],
    },
    to: BinaryOperation {
     operator: NotEqualTo,
     operands: [
      PropertyAccess {
       expression: Variable {
        identifier: "cfg",
        position: (4, 16),
       },
       attribute_path: AttributePath {
        parts: [
         Raw {
          content: "sshAccess",
          position: (4, 20),
         },
        ],
       },
       default: None,
      },
      List {
       elements: [],
       position: (4, 33),
      },
     ],
     position: (4, 30),
    },
   },
   Binding {
    from: AttributePath {
     parts: [
      Raw {
       content: "serviceEnabled",
       position: (5, 3),
      },
     ],
    },
    to: BinaryOperation {
     operator: NotEqualTo,
     operands: [
      PropertyAccess {
       expression: Variable {
        identifier: "cfg",
        position: (5, 20),
       },
       attribute_path: AttributePath {
        parts: [
         Raw {
          content: "instances",
          position: (5, 24),
         },
        ],
       },
       default: None,
      },
      Map {
       bindings: [],
       recursive: false,
       position: (5, 37),
      },
     ],
     position: (5, 34),
    },
   },
   Binding {
    from: AttributePath {
     parts: [
      Raw {
       content: "attr2Lines",
       position: (6, 3),
      },
     ],
    },
    to: Function {
     argument: Simple {
      identifier: "attr",
     },
     definition: LetIn {
      bindings: [
       Binding {
        from: AttributePath {
         parts: [
          Raw {
           content: "pairs",
           position: (8, 7),
          },
         ],
        },
        to: FunctionApplication {
         function: PropertyAccess {
          expression: Variable {
           identifier: "lib",
           position: (8, 15),
          },
          attribute_path: AttributePath {
           parts: [
            Raw {
             content: "attrsets",
             position: (8, 19),
            },
            Raw {
             content: "mapAttrsToList",
             position: (8, 28),
            },
           ],
          },
          default: None,
         },
         arguments: [
          Parentheses {
           expression: Function {
            argument: Simple {
             identifier: "name",
            },
            definition: Function {
             argument: Simple {
              identifier: "value",
             },
             definition: Map {
              bindings: [
               Inherit {
                from: None,
                attributes: [
                 Raw {
                  content: "name",
                  position: (8, 67),
                 },
                 Raw {
                  content: "value",
                  position: (8, 72),
                 },
                ],
               },
              ],
              recursive: false,
              position: (8, 57),
             },
             position: (8, 50),
            },
            position: (8, 44),
           },
           position: (8, 43),
          },
          Variable {
           identifier: "attr",
           position: (8, 82),
          },
         ],
        },
       },
       Binding {
        from: AttributePath {
         parts: [
          Raw {
           content: "isSubsection",
           position: (9, 7),
          },
         ],
        },
        to: Function {
         argument: Simple {
          identifier: "value",
         },
         definition: IfThenElse {
          predicate: FunctionApplication {
           function: PropertyAccess {
            expression: Variable {
             identifier: "builtins",
             position: (10, 12),
            },
            attribute_path: AttributePath {
             parts: [
              Raw {
               content: "isAttrs",
               position: (10, 21),
              },
             ],
            },
            default: None,
           },
           arguments: [
            Variable {
             identifier: "value",
             position: (10, 29),
            },
           ],
          },
          then: Variable {
           identifier: "true",
           position: (10, 40),
          },
          else_: IfThenElse {
           predicate: FunctionApplication {
            function: PropertyAccess {
             expression: Variable {
              identifier: "builtins",
              position: (11, 17),
             },
             attribute_path: AttributePath {
              parts: [
               Raw {
                content: "isString",
                position: (11, 26),
               },
              ],
             },
             default: None,
            },
            arguments: [
             Variable {
              identifier: "value",
              position: (11, 35),
             },
            ],
           },
           then: Variable {
            identifier: "false",
            position: (11, 46),
           },
           else_: FunctionApplication {
            function: Variable {
             identifier: "throw",
             position: (12, 14),
            },
            arguments: [
             String {
              parts: [
               Raw {
                content: "invalid type in btrbk config ",
                position: (12, 21),
               },
               Interpolation {
                expression: FunctionApplication {
                 function: PropertyAccess {
                  expression: Variable {
                   identifier: "builtins",
                   position: (12, 52),
                  },
                  attribute_path: AttributePath {
                   parts: [
                    Raw {
                     content: "typeOf",
                     position: (12, 61),
                    },
                   ],
                  },
                  default: None,
                 },
                 arguments: [
                  Variable {
                   identifier: "value",
                   position: (12, 68),
                  },
                 ],
                },
               },
              ],
              position: (12, 20),
             },
            ],
           },
           position: (11, 14),
          },
          position: (10, 9),
         },
         position: (9, 22),
        },
       },
       Binding {
        from: AttributePath {
         parts: [
          Raw {
           content: "sortedPairs",
           position: (13, 7),
          },
         ],
        },
        to: FunctionApplication {
         function: PropertyAccess {
          expression: Variable {
           identifier: "lib",
           position: (13, 21),
          },
          attribute_path: AttributePath {
           parts: [
            Raw {
             content: "lists",
             position: (13, 25),
            },
            Raw {
             content: "partition",
             position: (13, 31),
            },
           ],
          },
          default: None,
         },
         arguments: [
          Parentheses {
           expression: Function {
            argument: Simple {
             identifier: "x",
            },
            definition: FunctionApplication {
             function: Variable {
              identifier: "isSubsection",
              position: (13, 45),
             },
             arguments: [
              PropertyAccess {
               expression: Variable {
                identifier: "x",
                position: (13, 58),
               },
               attribute_path: AttributePath {
                parts: [
                 Raw {
                  content: "value",
                  position: (13, 60),
                 },
                ],
               },
               default: None,
              },
             ],
            },
            position: (13, 42),
           },
           position: (13, 41),
          },
          Variable {
           identifier: "pairs",
           position: (13, 67),
          },
         ],
        },
       },
      ],
      target: FunctionApplication {
       function: PropertyAccess {
        expression: Variable {
         identifier: "lib",
         position: (15, 5),
        },
        attribute_path: AttributePath {
         parts: [
          Raw {
           content: "flatten",
           position: (15, 9),
          },
         ],
        },
        default: None,
       },
       arguments: [
        Parentheses {
         expression: BinaryOperation {
          operator: Concatenation,
          operands: [
           Parentheses {
            expression: FunctionApplication {
             function: Variable {
              identifier: "map",
              position: (18, 9),
             },
             arguments: [
              Parentheses {
               expression: Function {
                argument: Simple {
                 identifier: "pair",
                },
                definition: List {
                 elements: [
                  String {
                   parts: [
                    Interpolation {
                     expression: PropertyAccess {
                      expression: Variable {
                       identifier: "pair",
                       position: (18, 25),
                      },
                      attribute_path: AttributePath {
                       parts: [
                        Raw {
                         content: "name",
                         position: (18, 30),
                        },
                       ],
                      },
                      default: None,
                     },
                    },
                    Raw {
                     content: " ",
                     position: (18, 35),
                    },
                    Interpolation {
                     expression: PropertyAccess {
                      expression: Variable {
                       identifier: "pair",
                       position: (18, 38),
                      },
                      attribute_path: AttributePath {
                       parts: [
                        Raw {
                         content: "value",
                         position: (18, 43),
                        },
                       ],
                      },
                      default: None,
                     },
                    },
                   ],
                   position: (18, 22),
                  },
                 ],
                 position: (18, 20),
                },
                position: (18, 14),
               },
               position: (18, 13),
              },
              PropertyAccess {
               expression: Variable {
                identifier: "sortedPairs",
                position: (18, 54),
               },
               attribute_path: AttributePath {
                parts: [
                 Raw {
                  content: "wrong",
                  position: (18, 66),
                 },
                ],
               },
               default: None,
              },
             ],
            },
            position: (17, 7),
           },
           Parentheses {
            expression: FunctionApplication {
             function: Variable {
              identifier: "map",
              position: (22, 9),
             },
             arguments: [
              Parentheses {
               expression: Function {
                argument: Simple {
                 identifier: "pair",
                },
                definition: FunctionApplication {
                 function: PropertyAccess {
                  expression: Variable {
                   identifier: "lib",
                   position: (25, 13),
                  },
                  attribute_path: AttributePath {
                   parts: [
                    Raw {
                     content: "mapAttrsToList",
                     position: (25, 17),
                    },
                   ],
                  },
                  default: None,
                 },
                 arguments: [
                  Parentheses {
                   expression: Function {
                    argument: Simple {
                     identifier: "childname",
                    },
                    definition: Function {
                     argument: Simple {
                      identifier: "value",
                     },
                     definition: BinaryOperation {
                      operator: Concatenation,
                      operands: [
                       List {
                        elements: [
                         String {
                          parts: [
                           Interpolation {
                            expression: PropertyAccess {
                             expression: Variable {
                              identifier: "pair",
                              position: (28, 24),
                             },
                             attribute_path: AttributePath {
                              parts: [
                               Raw {
                                content: "name",
                                position: (28, 29),
                               },
                              ],
                             },
                             default: None,
                            },
                           },
                           Raw {
                            content: " ",
                            position: (28, 34),
                           },
                           Interpolation {
                            expression: Variable {
                             identifier: "childname",
                             position: (28, 37),
                            },
                           },
                          ],
                          position: (28, 21),
                         },
                        ],
                        position: (28, 19),
                       },
                       Parentheses {
                        expression: FunctionApplication {
                         function: Variable {
                          identifier: "map",
                          position: (28, 55),
                         },
                         arguments: [
                          Parentheses {
                           expression: Function {
                            argument: Simple {
                             identifier: "x",
                            },
                            definition: BinaryOperation {
                             operator: Addition,
                             operands: [
                              String {
                               parts: [
                                Raw {
                                 content: " ",
                                 position: (28, 64),
                                },
                               ],
                               position: (28, 63),
                              },
                              Variable {
                               identifier: "x",
                               position: (28, 69),
                              },
                             ],
                             position: (28, 67),
                            },
                            position: (28, 60),
                           },
                           position: (28, 59),
                          },
                          Parentheses {
                           expression: FunctionApplication {
                            function: Variable {
                             identifier: "attr2Lines",
                             position: (28, 73),
                            },
                            arguments: [
                             Variable {
                              identifier: "value",
                              position: (28, 84),
                             },
                            ],
                           },
                           position: (28, 72),
                          },
                         ],
                        },
                        position: (28, 54),
                       },
                      ],
                      position: (28, 51),
                     },
                     position: (27, 28),
                    },
                    position: (27, 17),
                   },
                   position: (26, 15),
                  },
                  PropertyAccess {
                   expression: Variable {
                    identifier: "pair",
                    position: (30, 15),
                   },
                   attribute_path: AttributePath {
                    parts: [
                     Raw {
                      content: "value",
                      position: (30, 20),
                     },
                    ],
                   },
                   default: None,
                  },
                 ],
                },
                position: (24, 13),
               },
               position: (23, 11),
              },
              PropertyAccess {
               expression: Variable {
                identifier: "sortedPairs",
                position: (32, 11),
               },
               attribute_path: AttributePath {
                parts: [
                 Raw {
                  content: "right",
                  position: (32, 23),
                 },
                ],
               },
               default: None,
              },
             ],
            },
            position: (21, 7),
           },
          ],
          position: (20, 7),
         },
         position: (15, 17),
        },
       ],
      },
      position: (7, 5),
     },
     position: (6, 16),
    },
   },
   Binding {
    from: AttributePath {
     parts: [
      Raw {
       content: "addDefaults",
       position: (36, 3),
      },
     ],
    },
    to: Function {
     argument: Simple {
      identifier: "settings",
     },
     definition: BinaryOperation {
      operator: Update,
      operands: [
       Map {
        bindings: [
         Binding {
          from: AttributePath {
           parts: [
            Raw {
             content: "backend",
             position: (36, 29),
            },
           ],
          },
          to: String {
           parts: [
            Raw {
             content: "btrfs-progs-sudo",
             position: (36, 40),
            },
           ],
           position: (36, 39),
          },
         },
        ],
        recursive: false,
        position: (36, 27),
       },
       Variable {
        identifier: "settings",
        position: (36, 64),
       },
      ],
      position: (36, 61),
     },
     position: (36, 17),
    },
   },
   Binding {
    from: AttributePath {
     parts: [
      Raw {
       content: "mkConfigFile",
       position: (37, 3),
      },
     ],
    },
    to: Function {
     argument: Simple {
      identifier: "settings",
     },
     definition: FunctionApplication {
      function: PropertyAccess {
       expression: Variable {
        identifier: "lib",
        position: (37, 28),
       },
       attribute_path: AttributePath {
        parts: [
         Raw {
          content: "concatStringsSep",
          position: (37, 32),
         },
        ],
       },
       default: None,
      },
      arguments: [
       String {
        parts: [
         Raw {
          content: "\n",
          position: (37, 50),
         },
        ],
        position: (37, 49),
       },
       Parentheses {
        expression: FunctionApplication {
         function: Variable {
          identifier: "attr2Lines",
          position: (37, 55),
         },
         arguments: [
          Parentheses {
           expression: FunctionApplication {
            function: Variable {
             identifier: "addDefaults",
             position: (37, 67),
            },
            arguments: [
             Variable {
              identifier: "settings",
              position: (37, 79),
             },
            ],
           },
           position: (37, 66),
          },
         ],
        },
        position: (37, 54),
       },
      ],
     },
     position: (37, 18),
    },
   },
   Binding {
    from: AttributePath {
     parts: [
      Raw {
       content: "mkTestedConfigFile",
       position: (38, 3),
      },
     ],
    },
    to: Function {
     argument: Simple {
      identifier: "name",
     },
     definition: Function {
      argument: Simple {
       identifier: "settings",
      },
      definition: LetIn {
       bindings: [
        Binding {
         from: AttributePath {
          parts: [
           Raw {
            content: "configFile",
            position: (40, 7),
           },
          ],
         },
         to: FunctionApplication {
          function: PropertyAccess {
           expression: Variable {
            identifier: "pkgs",
            position: (40, 20),
           },
           attribute_path: AttributePath {
            parts: [
             Raw {
              content: "writeText",
              position: (40, 25),
             },
            ],
           },
           default: None,
          },
          arguments: [
           String {
            parts: [
             Raw {
              content: "btrbk-",
              position: (40, 36),
             },
             Interpolation {
              expression: Variable {
               identifier: "name",
               position: (40, 44),
              },
             },
             Raw {
              content: ".conf",
              position: (40, 49),
             },
            ],
            position: (40, 35),
           },
           Parentheses {
            expression: FunctionApplication {
             function: Variable {
              identifier: "mkConfigFile",
              position: (40, 57),
             },
             arguments: [
              Variable {
               identifier: "settings",
               position: (40, 70),
              },
             ],
            },
            position: (40, 56),
           },
          ],
         },
        },
       ],
       target: FunctionApplication {
        function: PropertyAccess {
         expression: Variable {
          identifier: "pkgs",
          position: (42, 5),
         },
         attribute_path: AttributePath {
          parts: [
           Raw {
            content: "runCommand",
            position: (42, 10),
           },
          ],
         },
         default: None,
        },
        arguments: [
         String {
          parts: [
           Raw {
            content: "btrbk-",
            position: (42, 22),
           },
           Interpolation {
            expression: Variable {
             identifier: "name",
             position: (42, 30),
            },
           },
           Raw {
            content: "-tested.conf",
            position: (42, 35),
           },
          ],
          position: (42, 21),
         },
         Map {
          bindings: [],
          recursive: false,
          position: (42, 49),
         },
         String {
          parts: [
           Raw {
            content: "mkdir foo\ncp ",
            position: (43, 1),
           },
           Interpolation {
            expression: Variable {
             identifier: "configFile",
             position: (44, 12),
            },
           },
           Raw {
            content: " $out\nif (set +o pipefail; ",
            position: (44, 23),
           },
           Interpolation {
            expression: PropertyAccess {
             expression: Variable {
              identifier: "pkgs",
              position: (45, 30),
             },
             attribute_path: AttributePath {
              parts: [
               Raw {
                content: "btrbk",
                position: (45, 35),
               },
              ],
             },
             default: None,
            },
           },
           Raw {
            content: "/bin/btrbk -c $out ls foo 2>&1 | grep $out);\nthen\necho btrbk configuration is invalid\ncat $out\nexit 1\nfi;\n",
            position: (45, 41),
           },
          ],
          position: (42, 53),
         },
        ],
       },
       position: (39, 5),
      },
      position: (38, 30),
     },
     position: (38, 24),
    },
   },
  ],
  target: Map {
   bindings: [
    Binding {
     from: AttributePath {
      parts: [
       Raw {
        content: "options",
        position: (54, 3),
       },
      ],
     },
     to: Map {
      bindings: [
       Binding {
        from: AttributePath {
         parts: [
          Raw {
           content: "services",
           position: (55, 5),
          },
          Raw {
           content: "btrbk",
           position: (55, 14),
          },
         ],
        },
        to: Map {
         bindings: [
          Binding {
           from: AttributePath {
            parts: [
             Raw {
              content: "extraPackages",
              position: (56, 7),
             },
            ],
           },
           to: FunctionApplication {
            function: PropertyAccess {
             expression: Variable {
              identifier: "lib",
              position: (56, 23),
             },
             attribute_path: AttributePath {
              parts: [
               Raw {
                content: "mkOption",
                position: (56, 27),
               },
              ],
             },
             default: None,
            },
            arguments: [
             Map {
              bindings: [
               Binding {
                from: AttributePath {
                 parts: [
                  Raw {
                   content: "description",
                   position: (57, 9),
                  },
                 ],
                },
                to: String {
                 parts: [
                  Raw {
                   content: "Extra packages for btrbk, like compression utilities for <literal>stream_compress</literal>",
                   position: (57, 24),
                  },
                 ],
                 position: (57, 23),
                },
               },
               Binding {
                from: AttributePath {
                 parts: [
                  Raw {
                   content: "type",
                   position: (58, 9),
                  },
                 ],
                },
                to: FunctionApplication {
                 function: PropertyAccess {
                  expression: Variable {
                   identifier: "lib",
                   position: (58, 16),
                  },
                  attribute_path: AttributePath {
                   parts: [
                    Raw {
                     content: "types",
                     position: (58, 20),
                    },
                    Raw {
                     content: "listOf",
                     position: (58, 26),
                    },
                   ],
                  },
                  default: None,
                 },
                 arguments: [
                  PropertyAccess {
                   expression: Variable {
                    identifier: "lib",
                    position: (58, 33),
                   },
                   attribute_path: AttributePath {
                    parts: [
                     Raw {
                      content: "types",
                      position: (58, 37),
                     },
                     Raw {
                      content: "package",
                      position: (58, 43),
                     },
                    ],
                   },
                   default: None,
                  },
                 ],
                },
               },
               Binding {
                from: AttributePath {
                 parts: [
                  Raw {
                   content: "default",
                   position: (59, 9),
                  },
                 ],
                },
                to: List {
                 elements: [],
                 position: (59, 19),
                },
               },
               Binding {
                from: AttributePath {
                 parts: [
                  Raw {
                   content: "example",
                   position: (60, 9),
                  },
                 ],
                },
                to: FunctionApplication {
                 function: PropertyAccess {
                  expression: Variable {
                   identifier: "lib",
                   position: (60, 19),
                  },
                  attribute_path: AttributePath {
                   parts: [
                    Raw {
                     content: "literalExpression",
                     position: (60, 23),
                    },
                   ],
                  },
                  default: None,
                 },
                 arguments: [
                  String {
                   parts: [
                    Raw {
                     content: "[ pkgs.xz ]",
                     position: (60, 42),
                    },
                   ],
                   position: (60, 41),
                  },
                 ],
                },
               },
              ],
              recursive: false,
              position: (56, 36),
             },
            ],
           },
          },
          Binding {
           from: AttributePath {
            parts: [
             Raw {
              content: "niceness",
              position: (62, 7),
             },
            ],
           },
           to: FunctionApplication {
            function: PropertyAccess {
             expression: Variable {
              identifier: "lib",
              position: (62, 18),
             },
             attribute_path: AttributePath {
              parts: [
               Raw {
                content: "mkOption",
                position: (62, 22),
               },
              ],
             },
             default: None,
            },
            arguments: [
             Map {
              bindings: [
               Binding {
                from: AttributePath {
                 parts: [
                  Raw {
                   content: "description",
                   position: (63, 9),
                  },
                 ],
                },
                to: String {
                 parts: [
                  Raw {
                   content: "Niceness for local instances of btrbk. Also applies to remote ones connecting via ssh when positive.",
                   position: (63, 24),
                  },
                 ],
                 position: (63, 23),
                },
               },
               Binding {
                from: AttributePath {
                 parts: [
                  Raw {
                   content: "type",
                   position: (64, 9),
                  },
                 ],
                },
                to: FunctionApplication {
                 function: PropertyAccess {
                  expression: Variable {
                   identifier: "lib",
                   position: (64, 16),
                  },
                  attribute_path: AttributePath {
                   parts: [
                    Raw {
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