@ ProgramNode (location: (0...8))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...8))
    └── body: (length: 1)
        └── @ ArrayNode (location: (0...8))
            ├── elements: (length: 1)
            │   └── @ KeywordHashNode (location: (1...7))
            │       └── elements: (length: 1)
            │           └── @ AssocNode (location: (1...7))
            │               ├── key:
            │               │   @ IntegerNode (location: (1...2))
            │               │   └── flags: decimal
            │               ├── value:
            │               │   @ IntegerNode (location: (6...7))
            │               │   └── flags: decimal
            │               └── operator_loc: (3...5) = "=>"
            ├── opening_loc: (0...1) = "["
            └── closing_loc: (7...8) = "]"
