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