@ ProgramNode (location: (0...37))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...37))
    └── body: (length: 4)
        ├── @ YieldNode (location: (0...5))
        │   ├── keyword_loc: (0...5) = "yield"
        │   ├── lparen_loc: ∅
        │   ├── arguments: ∅
        │   └── rparen_loc: ∅
        ├── @ YieldNode (location: (7...16))
        │   ├── keyword_loc: (7...12) = "yield"
        │   ├── lparen_loc: ∅
        │   ├── arguments:
        │   │   @ ArgumentsNode (location: (13...16))
        │   │   └── arguments: (length: 1)
        │   │       └── @ CallNode (location: (13...16))
        │   │           ├── receiver: ∅
        │   │           ├── call_operator_loc: ∅
        │   │           ├── message_loc: (13...16) = "foo"
        │   │           ├── opening_loc: ∅
        │   │           ├── arguments: ∅
        │   │           ├── closing_loc: ∅
        │   │           ├── block: ∅
        │   │           ├── flags: variable_call
        │   │           └── name: "foo"
        │   └── rparen_loc: ∅
        ├── @ YieldNode (location: (18...25))
        │   ├── keyword_loc: (18...23) = "yield"
        │   ├── lparen_loc: (23...24) = "("
        │   ├── arguments: ∅
        │   └── rparen_loc: (24...25) = ")"
        └── @ YieldNode (location: (27...37))
            ├── keyword_loc: (27...32) = "yield"
            ├── lparen_loc: (32...33) = "("
            ├── arguments:
            │   @ ArgumentsNode (location: (33...36))
            │   └── arguments: (length: 1)
            │       └── @ CallNode (location: (33...36))
            │           ├── receiver: ∅
            │           ├── call_operator_loc: ∅
            │           ├── message_loc: (33...36) = "foo"
            │           ├── opening_loc: ∅
            │           ├── arguments: ∅
            │           ├── closing_loc: ∅
            │           ├── block: ∅
            │           ├── flags: variable_call
            │           └── name: "foo"
            └── rparen_loc: (36...37) = ")"
