@ ProgramNode (location: (1,0)-(7,28))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(7,28))
    └── body: (length: 4)
        ├── @ DefNode (location: (1,0)-(1,19))
        │   ├── name: :foo
        │   ├── name_loc: (1,4)-(1,7) = "foo"
        │   ├── receiver: ∅
        │   ├── parameters: ∅
        │   ├── body:
        │   │   @ StatementsNode (location: (1,9)-(1,14))
        │   │   └── body: (length: 1)
        │   │       └── @ YieldNode (location: (1,9)-(1,14))
        │   │           ├── keyword_loc: (1,9)-(1,14) = "yield"
        │   │           ├── lparen_loc: ∅
        │   │           ├── arguments: ∅
        │   │           └── rparen_loc: ∅
        │   ├── locals: []
        │   ├── def_keyword_loc: (1,0)-(1,3) = "def"
        │   ├── operator_loc: ∅
        │   ├── lparen_loc: ∅
        │   ├── rparen_loc: ∅
        │   ├── equal_loc: ∅
        │   └── end_keyword_loc: (1,16)-(1,19) = "end"
        ├── @ DefNode (location: (3,0)-(3,21))
        │   ├── name: :foo
        │   ├── name_loc: (3,4)-(3,7) = "foo"
        │   ├── receiver: ∅
        │   ├── parameters: ∅
        │   ├── body:
        │   │   @ StatementsNode (location: (3,9)-(3,16))
        │   │   └── body: (length: 1)
        │   │       └── @ YieldNode (location: (3,9)-(3,16))
        │   │           ├── keyword_loc: (3,9)-(3,14) = "yield"
        │   │           ├── lparen_loc: (3,14)-(3,15) = "("
        │   │           ├── arguments: ∅
        │   │           └── rparen_loc: (3,15)-(3,16) = ")"
        │   ├── locals: []
        │   ├── def_keyword_loc: (3,0)-(3,3) = "def"
        │   ├── operator_loc: ∅
        │   ├── lparen_loc: ∅
        │   ├── rparen_loc: ∅
        │   ├── equal_loc: ∅
        │   └── end_keyword_loc: (3,18)-(3,21) = "end"
        ├── @ DefNode (location: (5,0)-(5,22))
        │   ├── name: :foo
        │   ├── name_loc: (5,4)-(5,7) = "foo"
        │   ├── receiver: ∅
        │   ├── parameters: ∅
        │   ├── body:
        │   │   @ StatementsNode (location: (5,9)-(5,17))
        │   │   └── body: (length: 1)
        │   │       └── @ YieldNode (location: (5,9)-(5,17))
        │   │           ├── keyword_loc: (5,9)-(5,14) = "yield"
        │   │           ├── lparen_loc: (5,14)-(5,15) = "("
        │   │           ├── arguments:
        │   │           │   @ ArgumentsNode (location: (5,15)-(5,16))
        │   │           │   ├── flags: ∅
        │   │           │   └── arguments: (length: 1)
        │   │           │       └── @ IntegerNode (location: (5,15)-(5,16))
        │   │           │           ├── flags: decimal
        │   │           │           └── value: 1
        │   │           └── rparen_loc: (5,16)-(5,17) = ")"
        │   ├── locals: []
        │   ├── def_keyword_loc: (5,0)-(5,3) = "def"
        │   ├── operator_loc: ∅
        │   ├── lparen_loc: ∅
        │   ├── rparen_loc: ∅
        │   ├── equal_loc: ∅
        │   └── end_keyword_loc: (5,19)-(5,22) = "end"
        └── @ DefNode (location: (7,0)-(7,28))
            ├── name: :foo
            ├── name_loc: (7,4)-(7,7) = "foo"
            ├── receiver: ∅
            ├── parameters: ∅
            ├── body:
            │   @ StatementsNode (location: (7,9)-(7,23))
            │   └── body: (length: 1)
            │       └── @ YieldNode (location: (7,9)-(7,23))
            │           ├── keyword_loc: (7,9)-(7,14) = "yield"
            │           ├── lparen_loc: (7,14)-(7,15) = "("
            │           ├── arguments:
            │           │   @ ArgumentsNode (location: (7,15)-(7,22))
            │           │   ├── flags: ∅
            │           │   └── arguments: (length: 3)
            │           │       ├── @ IntegerNode (location: (7,15)-(7,16))
            │           │       │   ├── flags: decimal
            │           │       │   └── value: 1
            │           │       ├── @ IntegerNode (location: (7,18)-(7,19))
            │           │       │   ├── flags: decimal
            │           │       │   └── value: 2
            │           │       └── @ IntegerNode (location: (7,21)-(7,22))
            │           │           ├── flags: decimal
            │           │           └── value: 3
            │           └── rparen_loc: (7,22)-(7,23) = ")"
            ├── locals: []
            ├── def_keyword_loc: (7,0)-(7,3) = "def"
            ├── operator_loc: ∅
            ├── lparen_loc: ∅
            ├── rparen_loc: ∅
            ├── equal_loc: ∅
            └── end_keyword_loc: (7,25)-(7,28) = "end"