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