@ ProgramNode (location: (0...35))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...35))
    └── body: (length: 1)
        └── @ DefNode (location: (0...35))
            ├── name: :some_method
            ├── name_loc: (6...17) = "some_method"
            ├── receiver:
            │   @ CallNode (location: (4...5))
            │   ├── receiver: ∅
            │   ├── call_operator_loc: ∅
            │   ├── message_loc: (4...5) = "x"
            │   ├── opening_loc: ∅
            │   ├── arguments: ∅
            │   ├── closing_loc: ∅
            │   ├── block: ∅
            │   ├── flags: variable_call
            │   └── name: "x"
            ├── parameters: ∅
            ├── body:
            │   @ StatementsNode (location: (20...35))
            │   └── body: (length: 1)
            │       └── @ CallNode (location: (20...35))
            │           ├── receiver: ∅
            │           ├── call_operator_loc: ∅
            │           ├── message_loc: (20...32) = "other_method"
            │           ├── opening_loc: ∅
            │           ├── arguments:
            │           │   @ ArgumentsNode (location: (33...35))
            │           │   └── arguments: (length: 1)
            │           │       └── @ IntegerNode (location: (33...35))
            │           │           └── flags: decimal
            │           ├── closing_loc: ∅
            │           ├── block: ∅
            │           ├── flags: ∅
            │           └── name: "other_method"
            ├── locals: []
            ├── def_keyword_loc: (0...3) = "def"
            ├── operator_loc: (5...6) = "."
            ├── lparen_loc: ∅
            ├── rparen_loc: ∅
            ├── equal_loc: (18...19) = "="
            └── end_keyword_loc: ∅
