@ ProgramNode (location: (0...40))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...40))
    └── body: (length: 2)
        ├── @ CallNode (location: (0...33))
        │   ├── receiver: ∅
        │   ├── call_operator_loc: ∅
        │   ├── message_loc: (0...4) = "puts"
        │   ├── opening_loc: ∅
        │   ├── arguments:
        │   │   @ ArgumentsNode (location: (5...33))
        │   │   └── arguments: (length: 1)
        │   │       └── @ StringNode (location: (5...33))
        │   │           ├── opening_loc: (5...6) = "\""
        │   │           ├── content_loc: (6...32) = "hello\\\n my\\\n dear\\\n friend"
        │   │           ├── closing_loc: (32...33) = "\""
        │   │           └── unescaped: "hello my dear friend"
        │   ├── closing_loc: ∅
        │   ├── block: ∅
        │   ├── flags: ∅
        │   └── name: "puts"
        └── @ CallNode (location: (35...40))
            ├── receiver:
            │   @ CallNode (location: (35...36))
            │   ├── receiver: ∅
            │   ├── call_operator_loc: ∅
            │   ├── message_loc: (35...36) = "a"
            │   ├── opening_loc: ∅
            │   ├── arguments: ∅
            │   ├── closing_loc: ∅
            │   ├── block: ∅
            │   ├── flags: variable_call
            │   └── name: "a"
            ├── call_operator_loc: ∅
            ├── message_loc: (37...38) = "+"
            ├── opening_loc: ∅
            ├── arguments:
            │   @ ArgumentsNode (location: (39...40))
            │   └── arguments: (length: 1)
            │       └── @ CallNode (location: (39...40))
            │           ├── receiver: ∅
            │           ├── call_operator_loc: ∅
            │           ├── message_loc: (39...40) = "b"
            │           ├── opening_loc: ∅
            │           ├── arguments: ∅
            │           ├── closing_loc: ∅
            │           ├── block: ∅
            │           ├── flags: variable_call
            │           └── name: "b"
            ├── closing_loc: ∅
            ├── block: ∅
            ├── flags: ∅
            └── name: "+"
