@ ProgramNode (location: (0...31))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...31))
    └── body: (length: 2)
        ├── @ CallNode (location: (0...14))
        │   ├── receiver: ∅
        │   ├── call_operator_loc: ∅
        │   ├── message_loc: (0...3) = "foo"
        │   ├── opening_loc: ∅
        │   ├── arguments:
        │   │   @ ArgumentsNode (location: (4...14))
        │   │   └── arguments: (length: 1)
        │   │       └── @ CallNode (location: (4...14))
        │   │           ├── receiver:
        │   │           │   @ ParenthesesNode (location: (4...10))
        │   │           │   ├── body:
        │   │           │   │   @ StatementsNode (location: (5...9))
        │   │           │   │   └── body: (length: 1)
        │   │           │   │       └── @ FloatNode (location: (5...9))
        │   │           │   ├── opening_loc: (4...5) = "("
        │   │           │   └── closing_loc: (9...10) = ")"
        │   │           ├── call_operator_loc: (10...11) = "."
        │   │           ├── message_loc: (11...14) = "abs"
        │   │           ├── opening_loc: ∅
        │   │           ├── arguments: ∅
        │   │           ├── closing_loc: ∅
        │   │           ├── block: ∅
        │   │           ├── flags: ∅
        │   │           └── name: "abs"
        │   ├── closing_loc: ∅
        │   ├── block: ∅
        │   ├── flags: ∅
        │   └── name: "foo"
        └── @ CallNode (location: (16...31))
            ├── receiver: ∅
            ├── call_operator_loc: ∅
            ├── message_loc: (16...20) = "meth"
            ├── opening_loc: ∅
            ├── arguments:
            │   @ ArgumentsNode (location: (21...31))
            │   └── arguments: (length: 1)
            │       └── @ CallNode (location: (21...31))
            │           ├── receiver:
            │           │   @ ParenthesesNode (location: (21...27))
            │           │   ├── body:
            │           │   │   @ StatementsNode (location: (22...26))
            │           │   │   └── body: (length: 1)
            │           │   │       └── @ FloatNode (location: (22...26))
            │           │   ├── opening_loc: (21...22) = "("
            │           │   └── closing_loc: (26...27) = ")"
            │           ├── call_operator_loc: (27...28) = "."
            │           ├── message_loc: (28...31) = "abs"
            │           ├── opening_loc: ∅
            │           ├── arguments: ∅
            │           ├── closing_loc: ∅
            │           ├── block: ∅
            │           ├── flags: ∅
            │           └── name: "abs"
            ├── closing_loc: ∅
            ├── block: ∅
            ├── flags: ∅
            └── name: "meth"
