@ ProgramNode (location: (0...31))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...31))
    └── body: (length: 3)
        ├── @ CallNode (location: (0...11))
        │   ├── receiver: ∅
        │   ├── call_operator_loc: ∅
        │   ├── message_loc: (0...1) = "x"
        │   ├── opening_loc: ∅
        │   ├── arguments:
        │   │   @ ArgumentsNode (location: (2...11))
        │   │   └── arguments: (length: 1)
        │   │       └── @ KeywordHashNode (location: (2...11))
        │   │           └── elements: (length: 1)
        │   │               └── @ AssocNode (location: (2...11))
        │   │                   ├── key:
        │   │                   │   @ InterpolatedSymbolNode (location: (2...9))
        │   │                   │   ├── opening_loc: (2...3) = "\""
        │   │                   │   ├── parts: (length: 1)
        │   │                   │   │   └── @ EmbeddedStatementsNode (location: (3...7))
        │   │                   │   │       ├── opening_loc: (3...5) = "\#{"
        │   │                   │   │       ├── statements:
        │   │                   │   │       │   @ StatementsNode (location: (5...6))
        │   │                   │   │       │   └── body: (length: 1)
        │   │                   │   │       │       └── @ CallNode (location: (5...6))
        │   │                   │   │       │           ├── receiver: ∅
        │   │                   │   │       │           ├── call_operator_loc: ∅
        │   │                   │   │       │           ├── message_loc: (5...6) = "k"
        │   │                   │   │       │           ├── opening_loc: ∅
        │   │                   │   │       │           ├── arguments: ∅
        │   │                   │   │       │           ├── closing_loc: ∅
        │   │                   │   │       │           ├── block: ∅
        │   │                   │   │       │           ├── flags: variable_call
        │   │                   │   │       │           └── name: "k"
        │   │                   │   │       └── closing_loc: (6...7) = "}"
        │   │                   │   └── closing_loc: (7...9) = "\":"
        │   │                   ├── value:
        │   │                   │   @ IntegerNode (location: (9...11))
        │   │                   │   └── flags: decimal
        │   │                   └── operator_loc: ∅
        │   ├── closing_loc: ∅
        │   ├── block: ∅
        │   ├── flags: ∅
        │   └── name: "x"
        ├── @ CallNode (location: (13...21))
        │   ├── receiver: ∅
        │   ├── call_operator_loc: ∅
        │   ├── message_loc: (13...14) = "x"
        │   ├── opening_loc: ∅
        │   ├── arguments:
        │   │   @ ArgumentsNode (location: (15...21))
        │   │   └── arguments: (length: 1)
        │   │       └── @ KeywordHashNode (location: (15...21))
        │   │           └── elements: (length: 1)
        │   │               └── @ AssocNode (location: (15...21))
        │   │                   ├── key:
        │   │                   │   @ SymbolNode (location: (15...19))
        │   │                   │   ├── opening_loc: (15...16) = "\""
        │   │                   │   ├── value_loc: (16...17) = "k"
        │   │                   │   ├── closing_loc: (17...19) = "\":"
        │   │                   │   └── unescaped: "k"
        │   │                   ├── value:
        │   │                   │   @ IntegerNode (location: (19...21))
        │   │                   │   └── flags: decimal
        │   │                   └── operator_loc: ∅
        │   ├── closing_loc: ∅
        │   ├── block: ∅
        │   ├── flags: ∅
        │   └── name: "x"
        └── @ CallNode (location: (23...31))
            ├── receiver: ∅
            ├── call_operator_loc: ∅
            ├── message_loc: (23...24) = "x"
            ├── opening_loc: ∅
            ├── arguments:
            │   @ ArgumentsNode (location: (25...31))
            │   └── arguments: (length: 1)
            │       └── @ KeywordHashNode (location: (25...31))
            │           └── elements: (length: 1)
            │               └── @ AssocNode (location: (25...31))
            │                   ├── key:
            │                   │   @ SymbolNode (location: (25...29))
            │                   │   ├── opening_loc: (25...26) = "'"
            │                   │   ├── value_loc: (26...27) = "k"
            │                   │   ├── closing_loc: (27...29) = "':"
            │                   │   └── unescaped: "k"
            │                   ├── value:
            │                   │   @ IntegerNode (location: (29...31))
            │                   │   └── flags: decimal
            │                   └── operator_loc: ∅
            ├── closing_loc: ∅
            ├── block: ∅
            ├── flags: ∅
            └── name: "x"
