@ ProgramNode (location: (1,0)-(7,13))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(7,13))
    └── body: (length: 4)
        ├── @ LambdaNode (location: (1,0)-(1,17))
        │   ├── locals: [:_1, :_2, :_3, :_4, :_5, :_6, :_7, :_8, :_9]
        │   ├── operator_loc: (1,0)-(1,2) = "->"
        │   ├── opening_loc: (1,3)-(1,5) = "do"
        │   ├── closing_loc: (1,14)-(1,17) = "end"
        │   ├── parameters:
        │   │   @ NumberedParametersNode (location: (1,0)-(1,17))
        │   │   └── maximum: 9
        │   └── body:
        │       @ StatementsNode (location: (1,6)-(1,13))
        │       └── body: (length: 1)
        │           └── @ CallNode (location: (1,6)-(1,13))
        │               ├── flags: ∅
        │               ├── receiver:
        │               │   @ LocalVariableReadNode (location: (1,6)-(1,8))
        │               │   ├── name: :_1
        │               │   └── depth: 0
        │               ├── call_operator_loc: ∅
        │               ├── name: :+
        │               ├── message_loc: (1,9)-(1,10) = "+"
        │               ├── opening_loc: ∅
        │               ├── arguments:
        │               │   @ ArgumentsNode (location: (1,11)-(1,13))
        │               │   ├── flags: ∅
        │               │   └── arguments: (length: 1)
        │               │       └── @ LocalVariableReadNode (location: (1,11)-(1,13))
        │               │           ├── name: :_9
        │               │           └── depth: 0
        │               ├── closing_loc: ∅
        │               └── block: ∅
        ├── @ LambdaNode (location: (3,0)-(3,13))
        │   ├── locals: [:_1, :_2, :_3, :_4, :_5, :_6, :_7, :_8, :_9]
        │   ├── operator_loc: (3,0)-(3,2) = "->"
        │   ├── opening_loc: (3,3)-(3,4) = "{"
        │   ├── closing_loc: (3,12)-(3,13) = "}"
        │   ├── parameters:
        │   │   @ NumberedParametersNode (location: (3,0)-(3,13))
        │   │   └── maximum: 9
        │   └── body:
        │       @ StatementsNode (location: (3,5)-(3,12))
        │       └── body: (length: 1)
        │           └── @ CallNode (location: (3,5)-(3,12))
        │               ├── flags: ∅
        │               ├── receiver:
        │               │   @ LocalVariableReadNode (location: (3,5)-(3,7))
        │               │   ├── name: :_1
        │               │   └── depth: 0
        │               ├── call_operator_loc: ∅
        │               ├── name: :+
        │               ├── message_loc: (3,8)-(3,9) = "+"
        │               ├── opening_loc: ∅
        │               ├── arguments:
        │               │   @ ArgumentsNode (location: (3,10)-(3,12))
        │               │   ├── flags: ∅
        │               │   └── arguments: (length: 1)
        │               │       └── @ LocalVariableReadNode (location: (3,10)-(3,12))
        │               │           ├── name: :_9
        │               │           └── depth: 0
        │               ├── closing_loc: ∅
        │               └── block: ∅
        ├── @ CallNode (location: (5,0)-(5,16))
        │   ├── flags: ignore_visibility
        │   ├── receiver: ∅
        │   ├── call_operator_loc: ∅
        │   ├── name: :m
        │   ├── message_loc: (5,0)-(5,1) = "m"
        │   ├── opening_loc: ∅
        │   ├── arguments: ∅
        │   ├── closing_loc: ∅
        │   └── block:
        │       @ BlockNode (location: (5,2)-(5,16))
        │       ├── locals: [:_1, :_2, :_3, :_4, :_5, :_6, :_7, :_8, :_9]
        │       ├── parameters:
        │       │   @ NumberedParametersNode (location: (5,2)-(5,16))
        │       │   └── maximum: 9
        │       ├── body:
        │       │   @ StatementsNode (location: (5,5)-(5,12))
        │       │   └── body: (length: 1)
        │       │       └── @ CallNode (location: (5,5)-(5,12))
        │       │           ├── flags: ∅
        │       │           ├── receiver:
        │       │           │   @ LocalVariableReadNode (location: (5,5)-(5,7))
        │       │           │   ├── name: :_1
        │       │           │   └── depth: 0
        │       │           ├── call_operator_loc: ∅
        │       │           ├── name: :+
        │       │           ├── message_loc: (5,8)-(5,9) = "+"
        │       │           ├── opening_loc: ∅
        │       │           ├── arguments:
        │       │           │   @ ArgumentsNode (location: (5,10)-(5,12))
        │       │           │   ├── flags: ∅
        │       │           │   └── arguments: (length: 1)
        │       │           │       └── @ LocalVariableReadNode (location: (5,10)-(5,12))
        │       │           │           ├── name: :_9
        │       │           │           └── depth: 0
        │       │           ├── closing_loc: ∅
        │       │           └── block: ∅
        │       ├── opening_loc: (5,2)-(5,4) = "do"
        │       └── closing_loc: (5,13)-(5,16) = "end"
        └── @ CallNode (location: (7,0)-(7,13))
            ├── flags: ignore_visibility
            ├── receiver: ∅
            ├── call_operator_loc: ∅
            ├── name: :m
            ├── message_loc: (7,0)-(7,1) = "m"
            ├── opening_loc: ∅
            ├── arguments: ∅
            ├── closing_loc: ∅
            └── block:
                @ BlockNode (location: (7,2)-(7,13))
                ├── locals: [:_1, :_2, :_3, :_4, :_5, :_6, :_7, :_8, :_9]
                ├── parameters:
                │   @ NumberedParametersNode (location: (7,2)-(7,13))
                │   └── maximum: 9
                ├── body:
                │   @ StatementsNode (location: (7,4)-(7,11))
                │   └── body: (length: 1)
                │       └── @ CallNode (location: (7,4)-(7,11))
                │           ├── flags: ∅
                │           ├── receiver:
                │           │   @ LocalVariableReadNode (location: (7,4)-(7,6))
                │           │   ├── name: :_1
                │           │   └── depth: 0
                │           ├── call_operator_loc: ∅
                │           ├── name: :+
                │           ├── message_loc: (7,7)-(7,8) = "+"
                │           ├── opening_loc: ∅
                │           ├── arguments:
                │           │   @ ArgumentsNode (location: (7,9)-(7,11))
                │           │   ├── flags: ∅
                │           │   └── arguments: (length: 1)
                │           │       └── @ LocalVariableReadNode (location: (7,9)-(7,11))
                │           │           ├── name: :_9
                │           │           └── depth: 0
                │           ├── closing_loc: ∅
                │           └── block: ∅
                ├── opening_loc: (7,2)-(7,3) = "{"
                └── closing_loc: (7,12)-(7,13) = "}"