@ ProgramNode (location: (1,0)-(1,3))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(1,3))
    └── body: (length: 1)
        └── @ HashNode (location: (1,0)-(1,3))
            ├── opening_loc: (1,0)-(1,1) = "{"
            ├── elements: (length: 0)
            └── closing_loc: (1,2)-(1,3) = "}"