@ ProgramNode (location: (1,0)-(1,8))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(1,8))
    └── body: (length: 1)
        └── @ YieldNode (location: (1,0)-(1,8))
            ├── keyword_loc: (1,0)-(1,5) = "yield"
            ├── lparen_loc: ∅
            ├── arguments:
            │   @ ArgumentsNode (location: (1,6)-(1,8))
            │   ├── flags: ∅
            │   └── arguments: (length: 1)
            │       └── @ IntegerNode (location: (1,6)-(1,8))
            │           ├── flags: decimal
            │           └── value: 42
            └── rparen_loc: ∅