@ ProgramNode (location: (1,0)-(11,14))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(11,14))
    └── body: (length: 6)
        ├── @ ReturnNode (location: (1,0)-(1,17))
        │   ├── keyword_loc: (1,0)-(1,6) = "return"
        │   └── arguments:
        │       @ ArgumentsNode (location: (1,7)-(1,17))
        │       ├── arguments: (length: 2)
        │       │   ├── @ IntegerNode (location: (1,7)-(1,8))
        │       │   │   └── flags: decimal
        │       │   └── @ KeywordHashNode (location: (1,10)-(1,17))
        │       │       └── elements: (length: 1)
        │       │           └── @ AssocNode (location: (1,10)-(1,17))
        │       │               ├── key:
        │       │               │   @ SymbolNode (location: (1,10)-(1,12))
        │       │               │   ├── opening_loc: (1,10)-(1,11) = ":"
        │       │               │   ├── value_loc: (1,11)-(1,12) = "z"
        │       │               │   ├── closing_loc: ∅
        │       │               │   └── unescaped: "z"
        │       │               ├── value:
        │       │               │   @ IntegerNode (location: (1,16)-(1,17))
        │       │               │   └── flags: decimal
        │       │               └── operator_loc: (1,13)-(1,15) = "=>"
        │       └── flags: ∅
        ├── @ ReturnNode (location: (3,0)-(3,26))
        │   ├── keyword_loc: (3,0)-(3,6) = "return"
        │   └── arguments:
        │       @ ArgumentsNode (location: (3,7)-(3,26))
        │       ├── arguments: (length: 2)
        │       │   ├── @ IntegerNode (location: (3,7)-(3,8))
        │       │   │   └── flags: decimal
        │       │   └── @ KeywordHashNode (location: (3,10)-(3,26))
        │       │       └── elements: (length: 2)
        │       │           ├── @ AssocNode (location: (3,10)-(3,17))
        │       │           │   ├── key:
        │       │           │   │   @ SymbolNode (location: (3,10)-(3,12))
        │       │           │   │   ├── opening_loc: (3,10)-(3,11) = ":"
        │       │           │   │   ├── value_loc: (3,11)-(3,12) = "z"
        │       │           │   │   ├── closing_loc: ∅
        │       │           │   │   └── unescaped: "z"
        │       │           │   ├── value:
        │       │           │   │   @ IntegerNode (location: (3,16)-(3,17))
        │       │           │   │   └── flags: decimal
        │       │           │   └── operator_loc: (3,13)-(3,15) = "=>"
        │       │           └── @ AssocNode (location: (3,19)-(3,26))
        │       │               ├── key:
        │       │               │   @ SymbolNode (location: (3,19)-(3,21))
        │       │               │   ├── opening_loc: (3,19)-(3,20) = ":"
        │       │               │   ├── value_loc: (3,20)-(3,21) = "w"
        │       │               │   ├── closing_loc: ∅
        │       │               │   └── unescaped: "w"
        │       │               ├── value:
        │       │               │   @ IntegerNode (location: (3,25)-(3,26))
        │       │               │   └── flags: decimal
        │       │               └── operator_loc: (3,22)-(3,24) = "=>"
        │       └── flags: ∅
        ├── @ ReturnNode (location: (5,0)-(5,14))
        │   ├── keyword_loc: (5,0)-(5,6) = "return"
        │   └── arguments:
        │       @ ArgumentsNode (location: (5,7)-(5,14))
        │       ├── arguments: (length: 1)
        │       │   └── @ CallNode (location: (5,7)-(5,14))
        │       │       ├── receiver: ∅
        │       │       ├── call_operator_loc: ∅
        │       │       ├── message_loc: (5,7)-(5,8) = "y"
        │       │       ├── opening_loc: ∅
        │       │       ├── arguments:
        │       │       │   @ ArgumentsNode (location: (5,9)-(5,14))
        │       │       │   ├── arguments: (length: 1)
        │       │       │   │   └── @ KeywordHashNode (location: (5,9)-(5,14))
        │       │       │   │       └── elements: (length: 1)
        │       │       │   │           └── @ AssocNode (location: (5,9)-(5,14))
        │       │       │   │               ├── key:
        │       │       │   │               │   @ SymbolNode (location: (5,9)-(5,11))
        │       │       │   │               │   ├── opening_loc: (5,9)-(5,10) = ":"
        │       │       │   │               │   ├── value_loc: (5,10)-(5,11) = "z"
        │       │       │   │               │   ├── closing_loc: ∅
        │       │       │   │               │   └── unescaped: "z"
        │       │       │   │               ├── value:
        │       │       │   │               │   @ IntegerNode (location: (5,13)-(5,14))
        │       │       │   │               │   └── flags: decimal
        │       │       │   │               └── operator_loc: (5,11)-(5,13) = "=>"
        │       │       │   └── flags: ∅
        │       │       ├── closing_loc: ∅
        │       │       ├── block: ∅
        │       │       ├── flags: ∅
        │       │       └── name: :y
        │       └── flags: ∅
        ├── @ ReturnNode (location: (7,0)-(7,12))
        │   ├── keyword_loc: (7,0)-(7,6) = "return"
        │   └── arguments:
        │       @ ArgumentsNode (location: (7,7)-(7,12))
        │       ├── arguments: (length: 1)
        │       │   └── @ CallNode (location: (7,7)-(7,12))
        │       │       ├── receiver: ∅
        │       │       ├── call_operator_loc: ∅
        │       │       ├── message_loc: (7,7)-(7,8) = "y"
        │       │       ├── opening_loc: ∅
        │       │       ├── arguments:
        │       │       │   @ ArgumentsNode (location: (7,9)-(7,12))
        │       │       │   ├── arguments: (length: 1)
        │       │       │   │   └── @ KeywordHashNode (location: (7,9)-(7,12))
        │       │       │   │       └── elements: (length: 1)
        │       │       │   │           └── @ AssocNode (location: (7,9)-(7,12))
        │       │       │   │               ├── key:
        │       │       │   │               │   @ SymbolNode (location: (7,9)-(7,11))
        │       │       │   │               │   ├── opening_loc: ∅
        │       │       │   │               │   ├── value_loc: (7,9)-(7,10) = "z"
        │       │       │   │               │   ├── closing_loc: (7,10)-(7,11) = ":"
        │       │       │   │               │   └── unescaped: "z"
        │       │       │   │               ├── value:
        │       │       │   │               │   @ IntegerNode (location: (7,11)-(7,12))
        │       │       │   │               │   └── flags: decimal
        │       │       │   │               └── operator_loc: ∅
        │       │       │   └── flags: ∅
        │       │       ├── closing_loc: ∅
        │       │       ├── block: ∅
        │       │       ├── flags: ∅
        │       │       └── name: :y
        │       └── flags: ∅
        ├── @ ReturnNode (location: (9,0)-(9,13))
        │   ├── keyword_loc: (9,0)-(9,6) = "return"
        │   └── arguments:
        │       @ ArgumentsNode (location: (9,7)-(9,13))
        │       ├── arguments: (length: 1)
        │       │   └── @ CallNode (location: (9,7)-(9,13))
        │       │       ├── receiver: ∅
        │       │       ├── call_operator_loc: ∅
        │       │       ├── message_loc: (9,7)-(9,8) = "y"
        │       │       ├── opening_loc: (9,8)-(9,9) = "("
        │       │       ├── arguments:
        │       │       │   @ ArgumentsNode (location: (9,9)-(9,12))
        │       │       │   ├── arguments: (length: 1)
        │       │       │   │   └── @ KeywordHashNode (location: (9,9)-(9,12))
        │       │       │   │       └── elements: (length: 1)
        │       │       │   │           └── @ AssocNode (location: (9,9)-(9,12))
        │       │       │   │               ├── key:
        │       │       │   │               │   @ SymbolNode (location: (9,9)-(9,11))
        │       │       │   │               │   ├── opening_loc: ∅
        │       │       │   │               │   ├── value_loc: (9,9)-(9,10) = "z"
        │       │       │   │               │   ├── closing_loc: (9,10)-(9,11) = ":"
        │       │       │   │               │   └── unescaped: "z"
        │       │       │   │               ├── value:
        │       │       │   │               │   @ IntegerNode (location: (9,11)-(9,12))
        │       │       │   │               │   └── flags: decimal
        │       │       │   │               └── operator_loc: ∅
        │       │       │   └── flags: ∅
        │       │       ├── closing_loc: (9,12)-(9,13) = ")"
        │       │       ├── block: ∅
        │       │       ├── flags: ∅
        │       │       └── name: :y
        │       └── flags: ∅
        └── @ ReturnNode (location: (11,0)-(11,14))
            ├── keyword_loc: (11,0)-(11,6) = "return"
            └── arguments:
                @ ArgumentsNode (location: (11,7)-(11,14))
                ├── arguments: (length: 1)
                │   └── @ CallNode (location: (11,7)-(11,14))
                │       ├── receiver: ∅
                │       ├── call_operator_loc: ∅
                │       ├── message_loc: (11,7)-(11,8) = "y"
                │       ├── opening_loc: (11,8)-(11,9) = "("
                │       ├── arguments:
                │       │   @ ArgumentsNode (location: (11,9)-(11,13))
                │       │   ├── arguments: (length: 1)
                │       │   │   └── @ KeywordHashNode (location: (11,9)-(11,13))
                │       │   │       └── elements: (length: 1)
                │       │   │           └── @ AssocNode (location: (11,9)-(11,13))
                │       │   │               ├── key:
                │       │   │               │   @ CallNode (location: (11,9)-(11,10))
                │       │   │               │   ├── receiver: ∅
                │       │   │               │   ├── call_operator_loc: ∅
                │       │   │               │   ├── message_loc: (11,9)-(11,10) = "z"
                │       │   │               │   ├── opening_loc: ∅
                │       │   │               │   ├── arguments: ∅
                │       │   │               │   ├── closing_loc: ∅
                │       │   │               │   ├── block: ∅
                │       │   │               │   ├── flags: variable_call
                │       │   │               │   └── name: :z
                │       │   │               ├── value:
                │       │   │               │   @ IntegerNode (location: (11,12)-(11,13))
                │       │   │               │   └── flags: decimal
                │       │   │               └── operator_loc: (11,10)-(11,12) = "=>"
                │       │   └── flags: ∅
                │       ├── closing_loc: (11,13)-(11,14) = ")"
                │       ├── block: ∅
                │       ├── flags: ∅
                │       └── name: :y
                └── flags: ∅
