@ ProgramNode (location: (1,0)-(5,8))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(5,8))
    └── body: (length: 3)
        ├── @ CallNode (location: (1,0)-(1,11))
        │   ├── flags: ignore_visibility
        │   ├── receiver: ∅
        │   ├── call_operator_loc: ∅
        │   ├── name: :x
        │   ├── message_loc: (1,0)-(1,1) = "x"
        │   ├── opening_loc: ∅
        │   ├── arguments:
        │   │   @ ArgumentsNode (location: (1,2)-(1,11))
        │   │   ├── flags: ∅
        │   │   └── arguments: (length: 1)
        │   │       └── @ KeywordHashNode (location: (1,2)-(1,11))
        │   │           ├── flags: ∅
        │   │           └── elements: (length: 1)
        │   │               └── @ AssocNode (location: (1,2)-(1,11))
        │   │                   ├── key:
        │   │                   │   @ InterpolatedSymbolNode (location: (1,2)-(1,9))
        │   │                   │   ├── opening_loc: (1,2)-(1,3) = "\""
        │   │                   │   ├── parts: (length: 1)
        │   │                   │   │   └── @ EmbeddedStatementsNode (location: (1,3)-(1,7))
        │   │                   │   │       ├── opening_loc: (1,3)-(1,5) = "\#{"
        │   │                   │   │       ├── statements:
        │   │                   │   │       │   @ StatementsNode (location: (1,5)-(1,6))
        │   │                   │   │       │   └── body: (length: 1)
        │   │                   │   │       │       └── @ CallNode (location: (1,5)-(1,6))
        │   │                   │   │       │           ├── flags: variable_call, ignore_visibility
        │   │                   │   │       │           ├── receiver: ∅
        │   │                   │   │       │           ├── call_operator_loc: ∅
        │   │                   │   │       │           ├── name: :k
        │   │                   │   │       │           ├── message_loc: (1,5)-(1,6) = "k"
        │   │                   │   │       │           ├── opening_loc: ∅
        │   │                   │   │       │           ├── arguments: ∅
        │   │                   │   │       │           ├── closing_loc: ∅
        │   │                   │   │       │           └── block: ∅
        │   │                   │   │       └── closing_loc: (1,6)-(1,7) = "}"
        │   │                   │   └── closing_loc: (1,7)-(1,9) = "\":"
        │   │                   ├── value:
        │   │                   │   @ IntegerNode (location: (1,9)-(1,11))
        │   │                   │   ├── flags: decimal
        │   │                   │   └── value: 42
        │   │                   └── operator_loc: ∅
        │   ├── closing_loc: ∅
        │   └── block: ∅
        ├── @ CallNode (location: (3,0)-(3,8))
        │   ├── flags: ignore_visibility
        │   ├── receiver: ∅
        │   ├── call_operator_loc: ∅
        │   ├── name: :x
        │   ├── message_loc: (3,0)-(3,1) = "x"
        │   ├── opening_loc: ∅
        │   ├── arguments:
        │   │   @ ArgumentsNode (location: (3,2)-(3,8))
        │   │   ├── flags: ∅
        │   │   └── arguments: (length: 1)
        │   │       └── @ KeywordHashNode (location: (3,2)-(3,8))
        │   │           ├── flags: symbol_keys
        │   │           └── elements: (length: 1)
        │   │               └── @ AssocNode (location: (3,2)-(3,8))
        │   │                   ├── key:
        │   │                   │   @ SymbolNode (location: (3,2)-(3,6))
        │   │                   │   ├── flags: forced_us_ascii_encoding
        │   │                   │   ├── opening_loc: (3,2)-(3,3) = "\""
        │   │                   │   ├── value_loc: (3,3)-(3,4) = "k"
        │   │                   │   ├── closing_loc: (3,4)-(3,6) = "\":"
        │   │                   │   └── unescaped: "k"
        │   │                   ├── value:
        │   │                   │   @ IntegerNode (location: (3,6)-(3,8))
        │   │                   │   ├── flags: decimal
        │   │                   │   └── value: 42
        │   │                   └── operator_loc: ∅
        │   ├── closing_loc: ∅
        │   └── block: ∅
        └── @ CallNode (location: (5,0)-(5,8))
            ├── flags: ignore_visibility
            ├── receiver: ∅
            ├── call_operator_loc: ∅
            ├── name: :x
            ├── message_loc: (5,0)-(5,1) = "x"
            ├── opening_loc: ∅
            ├── arguments:
            │   @ ArgumentsNode (location: (5,2)-(5,8))
            │   ├── flags: ∅
            │   └── arguments: (length: 1)
            │       └── @ KeywordHashNode (location: (5,2)-(5,8))
            │           ├── flags: symbol_keys
            │           └── elements: (length: 1)
            │               └── @ AssocNode (location: (5,2)-(5,8))
            │                   ├── key:
            │                   │   @ SymbolNode (location: (5,2)-(5,6))
            │                   │   ├── flags: forced_us_ascii_encoding
            │                   │   ├── opening_loc: (5,2)-(5,3) = "'"
            │                   │   ├── value_loc: (5,3)-(5,4) = "k"
            │                   │   ├── closing_loc: (5,4)-(5,6) = "':"
            │                   │   └── unescaped: "k"
            │                   ├── value:
            │                   │   @ IntegerNode (location: (5,6)-(5,8))
            │                   │   ├── flags: decimal
            │                   │   └── value: 42
            │                   └── operator_loc: ∅
            ├── closing_loc: ∅
            └── block: ∅