@ ProgramNode (location: (1,0)-(3,1))
├── flags: ∅
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(3,1))
    ├── flags: ∅
    └── body: (length: 1)
        └── @ HashNode (location: (1,0)-(3,1))
            ├── flags: newline, static_literal
            ├── opening_loc: (1,0)-(1,1) = "{"
            ├── elements: (length: 1)
            │   └── @ AssocNode (location: (2,0)-(2,8))
            │       ├── flags: static_literal
            │       ├── key:
            │       │   @ SymbolNode (location: (2,0)-(2,3))
            │       │   ├── flags: static_literal, forced_us_ascii_encoding
            │       │   ├── opening_loc: (2,0)-(2,1) = ":"
            │       │   ├── value_loc: (2,1)-(2,3) = "s1"
            │       │   ├── closing_loc: ∅
            │       │   └── unescaped: "s1"
            │       ├── value:
            │       │   @ IntegerNode (location: (2,7)-(2,8))
            │       │   ├── flags: static_literal, decimal
            │       │   └── value: 1
            │       └── operator_loc: (2,4)-(2,6) = "=>"
            └── closing_loc: (3,0)-(3,1) = "}"
