@ ProgramNode (location: (1,0)-(92,1))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(92,1))
    └── body: (length: 16)
        ├── @ ArrayNode (location: (1,0)-(4,1))
        │   ├── flags: ∅
        │   ├── elements: (length: 0)
        │   ├── opening_loc: (1,0)-(1,3) = "%I["
        │   └── closing_loc: (4,0)-(4,1) = "]"
        ├── @ ArrayNode (location: (6,0)-(9,1))
        │   ├── flags: ∅
        │   ├── elements: (length: 2)
        │   │   ├── @ SymbolNode (location: (7,0)-(7,5))
        │   │   │   ├── flags: forced_us_ascii_encoding
        │   │   │   ├── opening_loc: ∅
        │   │   │   ├── value_loc: (7,0)-(7,5) = "line2"
        │   │   │   ├── closing_loc: ∅
        │   │   │   └── unescaped: "line2"
        │   │   └── @ SymbolNode (location: (8,0)-(8,5))
        │   │       ├── flags: forced_us_ascii_encoding
        │   │       ├── opening_loc: ∅
        │   │       ├── value_loc: (8,0)-(8,5) = "line3"
        │   │       ├── closing_loc: ∅
        │   │       └── unescaped: "line3"
        │   ├── opening_loc: (6,0)-(6,3) = "%I["
        │   └── closing_loc: (9,0)-(9,1) = "]"
        ├── @ ArrayNode (location: (11,0)-(14,1))
        │   ├── flags: ∅
        │   ├── elements: (length: 0)
        │   ├── opening_loc: (11,0)-(11,3) = "%W["
        │   └── closing_loc: (14,0)-(14,1) = "]"
        ├── @ ArrayNode (location: (16,0)-(19,1))
        │   ├── flags: ∅
        │   ├── elements: (length: 2)
        │   │   ├── @ StringNode (location: (17,0)-(17,5))
        │   │   │   ├── flags: ∅
        │   │   │   ├── opening_loc: ∅
        │   │   │   ├── content_loc: (17,0)-(17,5) = "line2"
        │   │   │   ├── closing_loc: ∅
        │   │   │   └── unescaped: "line2"
        │   │   └── @ StringNode (location: (18,0)-(18,5))
        │   │       ├── flags: ∅
        │   │       ├── opening_loc: ∅
        │   │       ├── content_loc: (18,0)-(18,5) = "line3"
        │   │       ├── closing_loc: ∅
        │   │       └── unescaped: "line3"
        │   ├── opening_loc: (16,0)-(16,3) = "%W["
        │   └── closing_loc: (19,0)-(19,1) = "]"
        ├── @ ArrayNode (location: (21,0)-(24,1))
        │   ├── flags: ∅
        │   ├── elements: (length: 0)
        │   ├── opening_loc: (21,0)-(21,3) = "%i["
        │   └── closing_loc: (24,0)-(24,1) = "]"
        ├── @ ArrayNode (location: (26,0)-(29,1))
        │   ├── flags: ∅
        │   ├── elements: (length: 2)
        │   │   ├── @ SymbolNode (location: (27,0)-(27,5))
        │   │   │   ├── flags: forced_us_ascii_encoding
        │   │   │   ├── opening_loc: ∅
        │   │   │   ├── value_loc: (27,0)-(27,5) = "line2"
        │   │   │   ├── closing_loc: ∅
        │   │   │   └── unescaped: "line2"
        │   │   └── @ SymbolNode (location: (28,0)-(28,5))
        │   │       ├── flags: forced_us_ascii_encoding
        │   │       ├── opening_loc: ∅
        │   │       ├── value_loc: (28,0)-(28,5) = "line3"
        │   │       ├── closing_loc: ∅
        │   │       └── unescaped: "line3"
        │   ├── opening_loc: (26,0)-(26,3) = "%i["
        │   └── closing_loc: (29,0)-(29,1) = "]"
        ├── @ RegularExpressionNode (location: (31,0)-(34,1))
        │   ├── flags: forced_us_ascii_encoding
        │   ├── opening_loc: (31,0)-(31,3) = "%r["
        │   ├── content_loc: (31,3)-(34,0) = "\n\n\n"
        │   ├── closing_loc: (34,0)-(34,1) = "]"
        │   └── unescaped: "\n\n\n"
        ├── @ ArrayNode (location: (36,0)-(39,1))
        │   ├── flags: ∅
        │   ├── elements: (length: 0)
        │   ├── opening_loc: (36,0)-(36,3) = "%w["
        │   └── closing_loc: (39,0)-(39,1) = "]"
        ├── @ ArrayNode (location: (41,0)-(44,1))
        │   ├── flags: ∅
        │   ├── elements: (length: 2)
        │   │   ├── @ StringNode (location: (42,0)-(42,5))
        │   │   │   ├── flags: ∅
        │   │   │   ├── opening_loc: ∅
        │   │   │   ├── content_loc: (42,0)-(42,5) = "line2"
        │   │   │   ├── closing_loc: ∅
        │   │   │   └── unescaped: "line2"
        │   │   └── @ StringNode (location: (43,0)-(43,5))
        │   │       ├── flags: ∅
        │   │       ├── opening_loc: ∅
        │   │       ├── content_loc: (43,0)-(43,5) = "line3"
        │   │       ├── closing_loc: ∅
        │   │       └── unescaped: "line3"
        │   ├── opening_loc: (41,0)-(41,3) = "%w["
        │   └── closing_loc: (44,0)-(44,1) = "]"
        ├── @ ArrayNode (location: (46,0)-(49,1))
        │   ├── flags: ∅
        │   ├── elements: (length: 2)
        │   │   ├── @ SymbolNode (location: (47,0)-(47,6))
        │   │   │   ├── flags: forced_us_ascii_encoding
        │   │   │   ├── opening_loc: (47,0)-(47,1) = ":"
        │   │   │   ├── value_loc: (47,1)-(47,6) = "line2"
        │   │   │   ├── closing_loc: ∅
        │   │   │   └── unescaped: "line2"
        │   │   └── @ SymbolNode (location: (48,0)-(48,6))
        │   │       ├── flags: forced_us_ascii_encoding
        │   │       ├── opening_loc: (48,0)-(48,1) = ":"
        │   │       ├── value_loc: (48,1)-(48,6) = "line3"
        │   │       ├── closing_loc: ∅
        │   │       └── unescaped: "line3"
        │   ├── opening_loc: (46,0)-(46,1) = "["
        │   └── closing_loc: (49,0)-(49,1) = "]"
        ├── @ ClassNode (location: (51,0)-(56,3))
        │   ├── locals: []
        │   ├── class_keyword_loc: (51,0)-(51,5) = "class"
        │   ├── constant_path:
        │   │   @ ConstantReadNode (location: (51,6)-(51,7))
        │   │   └── name: :X
        │   ├── inheritance_operator_loc: ∅
        │   ├── superclass: ∅
        │   ├── body:
        │   │   @ StatementsNode (location: (52,2)-(55,5))
        │   │   └── body: (length: 1)
        │   │       └── @ DefNode (location: (52,2)-(55,5))
        │   │           ├── name: :y
        │   │           ├── name_loc: (52,11)-(52,12) = "y"
        │   │           ├── receiver:
        │   │           │   @ SelfNode (location: (52,6)-(52,10))
        │   │           ├── parameters:
        │   │           │   @ ParametersNode (location: (52,13)-(53,9))
        │   │           │   ├── requireds: (length: 2)
        │   │           │   │   ├── @ RequiredParameterNode (location: (52,13)-(52,14))
        │   │           │   │   │   ├── flags: ∅
        │   │           │   │   │   └── name: :a
        │   │           │   │   └── @ RequiredParameterNode (location: (53,8)-(53,9))
        │   │           │   │       ├── flags: ∅
        │   │           │   │       └── name: :b
        │   │           │   ├── optionals: (length: 0)
        │   │           │   ├── rest: ∅
        │   │           │   ├── posts: (length: 0)
        │   │           │   ├── keywords: (length: 0)
        │   │           │   ├── keyword_rest: ∅
        │   │           │   └── block: ∅
        │   │           ├── body:
        │   │           │   @ StatementsNode (location: (54,4)-(54,9))
        │   │           │   └── body: (length: 1)
        │   │           │       └── @ CallNode (location: (54,4)-(54,9))
        │   │           │           ├── flags: ∅
        │   │           │           ├── receiver:
        │   │           │           │   @ LocalVariableReadNode (location: (54,4)-(54,5))
        │   │           │           │   ├── name: :a
        │   │           │           │   └── depth: 0
        │   │           │           ├── call_operator_loc: ∅
        │   │           │           ├── name: :+
        │   │           │           ├── message_loc: (54,6)-(54,7) = "+"
        │   │           │           ├── opening_loc: ∅
        │   │           │           ├── arguments:
        │   │           │           │   @ ArgumentsNode (location: (54,8)-(54,9))
        │   │           │           │   ├── flags: ∅
        │   │           │           │   └── arguments: (length: 1)
        │   │           │           │       └── @ LocalVariableReadNode (location: (54,8)-(54,9))
        │   │           │           │           ├── name: :b
        │   │           │           │           └── depth: 0
        │   │           │           ├── closing_loc: ∅
        │   │           │           └── block: ∅
        │   │           ├── locals: [:a, :b]
        │   │           ├── def_keyword_loc: (52,2)-(52,5) = "def"
        │   │           ├── operator_loc: (52,10)-(52,11) = "."
        │   │           ├── lparen_loc: (52,12)-(52,13) = "("
        │   │           ├── rparen_loc: (53,9)-(53,10) = ")"
        │   │           ├── equal_loc: ∅
        │   │           └── end_keyword_loc: (55,2)-(55,5) = "end"
        │   ├── end_keyword_loc: (56,0)-(56,3) = "end"
        │   └── name: :X
        ├── @ ClassNode (location: (59,0)-(63,3))
        │   ├── locals: []
        │   ├── class_keyword_loc: (59,0)-(59,5) = "class"
        │   ├── constant_path:
        │   │   @ ConstantReadNode (location: (59,6)-(59,7))
        │   │   └── name: :X
        │   ├── inheritance_operator_loc: ∅
        │   ├── superclass: ∅
        │   ├── body:
        │   │   @ StatementsNode (location: (60,2)-(62,5))
        │   │   └── body: (length: 1)
        │   │       └── @ ClassNode (location: (60,2)-(62,5))
        │   │           ├── locals: []
        │   │           ├── class_keyword_loc: (60,2)-(60,7) = "class"
        │   │           ├── constant_path:
        │   │           │   @ ConstantReadNode (location: (60,8)-(60,9))
        │   │           │   └── name: :Y
        │   │           ├── inheritance_operator_loc: ∅
        │   │           ├── superclass: ∅
        │   │           ├── body:
        │   │           │   @ StatementsNode (location: (61,4)-(61,10))
        │   │           │   └── body: (length: 1)
        │   │           │       └── @ ConstantWriteNode (location: (61,4)-(61,10))
        │   │           │           ├── name: :Z
        │   │           │           ├── name_loc: (61,4)-(61,5) = "Z"
        │   │           │           ├── value:
        │   │           │           │   @ IntegerNode (location: (61,8)-(61,10))
        │   │           │           │   ├── flags: decimal
        │   │           │           │   └── value: 42
        │   │           │           └── operator_loc: (61,6)-(61,7) = "="
        │   │           ├── end_keyword_loc: (62,2)-(62,5) = "end"
        │   │           └── name: :Y
        │   ├── end_keyword_loc: (63,0)-(63,3) = "end"
        │   └── name: :X
        ├── @ ClassNode (location: (66,0)-(71,3))
        │   ├── locals: []
        │   ├── class_keyword_loc: (66,0)-(66,5) = "class"
        │   ├── constant_path:
        │   │   @ ConstantReadNode (location: (66,6)-(66,7))
        │   │   └── name: :X
        │   ├── inheritance_operator_loc: ∅
        │   ├── superclass: ∅
        │   ├── body:
        │   │   @ StatementsNode (location: (67,2)-(70,5))
        │   │   └── body: (length: 1)
        │   │       └── @ DefNode (location: (67,2)-(70,5))
        │   │           ├── name: :y
        │   │           ├── name_loc: (67,6)-(67,7) = "y"
        │   │           ├── receiver: ∅
        │   │           ├── parameters:
        │   │           │   @ ParametersNode (location: (67,8)-(68,9))
        │   │           │   ├── requireds: (length: 2)
        │   │           │   │   ├── @ RequiredParameterNode (location: (67,8)-(67,9))
        │   │           │   │   │   ├── flags: ∅
        │   │           │   │   │   └── name: :a
        │   │           │   │   └── @ RequiredParameterNode (location: (68,8)-(68,9))
        │   │           │   │       ├── flags: ∅
        │   │           │   │       └── name: :b
        │   │           │   ├── optionals: (length: 0)
        │   │           │   ├── rest: ∅
        │   │           │   ├── posts: (length: 0)
        │   │           │   ├── keywords: (length: 0)
        │   │           │   ├── keyword_rest: ∅
        │   │           │   └── block: ∅
        │   │           ├── body:
        │   │           │   @ StatementsNode (location: (69,4)-(69,9))
        │   │           │   └── body: (length: 1)
        │   │           │       └── @ CallNode (location: (69,4)-(69,9))
        │   │           │           ├── flags: ∅
        │   │           │           ├── receiver:
        │   │           │           │   @ LocalVariableReadNode (location: (69,4)-(69,5))
        │   │           │           │   ├── name: :a
        │   │           │           │   └── depth: 0
        │   │           │           ├── call_operator_loc: ∅
        │   │           │           ├── name: :+
        │   │           │           ├── message_loc: (69,6)-(69,7) = "+"
        │   │           │           ├── opening_loc: ∅
        │   │           │           ├── arguments:
        │   │           │           │   @ ArgumentsNode (location: (69,8)-(69,9))
        │   │           │           │   ├── flags: ∅
        │   │           │           │   └── arguments: (length: 1)
        │   │           │           │       └── @ LocalVariableReadNode (location: (69,8)-(69,9))
        │   │           │           │           ├── name: :b
        │   │           │           │           └── depth: 0
        │   │           │           ├── closing_loc: ∅
        │   │           │           └── block: ∅
        │   │           ├── locals: [:a, :b]
        │   │           ├── def_keyword_loc: (67,2)-(67,5) = "def"
        │   │           ├── operator_loc: ∅
        │   │           ├── lparen_loc: (67,7)-(67,8) = "("
        │   │           ├── rparen_loc: (68,9)-(68,10) = ")"
        │   │           ├── equal_loc: ∅
        │   │           └── end_keyword_loc: (70,2)-(70,5) = "end"
        │   ├── end_keyword_loc: (71,0)-(71,3) = "end"
        │   └── name: :X
        ├── @ ModuleNode (location: (74,0)-(79,3))
        │   ├── locals: []
        │   ├── module_keyword_loc: (74,0)-(74,6) = "module"
        │   ├── constant_path:
        │   │   @ ConstantReadNode (location: (74,7)-(74,8))
        │   │   └── name: :X
        │   ├── body:
        │   │   @ StatementsNode (location: (75,2)-(78,3))
        │   │   └── body: (length: 1)
        │   │       └── @ ConstantWriteNode (location: (75,2)-(78,3))
        │   │           ├── name: :X
        │   │           ├── name_loc: (75,2)-(75,3) = "X"
        │   │           ├── value:
        │   │           │   @ ArrayNode (location: (75,6)-(78,3))
        │   │           │   ├── flags: ∅
        │   │           │   ├── elements: (length: 2)
        │   │           │   │   ├── @ SymbolNode (location: (76,4)-(76,10))
        │   │           │   │   │   ├── flags: forced_us_ascii_encoding
        │   │           │   │   │   ├── opening_loc: (76,4)-(76,5) = ":"
        │   │           │   │   │   ├── value_loc: (76,5)-(76,10) = "line3"
        │   │           │   │   │   ├── closing_loc: ∅
        │   │           │   │   │   └── unescaped: "line3"
        │   │           │   │   └── @ SymbolNode (location: (77,4)-(77,10))
        │   │           │   │       ├── flags: forced_us_ascii_encoding
        │   │           │   │       ├── opening_loc: (77,4)-(77,5) = ":"
        │   │           │   │       ├── value_loc: (77,5)-(77,10) = "line4"
        │   │           │   │       ├── closing_loc: ∅
        │   │           │   │       └── unescaped: "line4"
        │   │           │   ├── opening_loc: (75,6)-(75,7) = "["
        │   │           │   └── closing_loc: (78,2)-(78,3) = "]"
        │   │           └── operator_loc: (75,4)-(75,5) = "="
        │   ├── end_keyword_loc: (79,0)-(79,3) = "end"
        │   └── name: :X
        ├── @ ModuleNode (location: (82,0)-(86,3))
        │   ├── locals: []
        │   ├── module_keyword_loc: (82,0)-(82,6) = "module"
        │   ├── constant_path:
        │   │   @ ConstantReadNode (location: (82,7)-(82,8))
        │   │   └── name: :X
        │   ├── body:
        │   │   @ StatementsNode (location: (83,2)-(85,5))
        │   │   └── body: (length: 1)
        │   │       └── @ ModuleNode (location: (83,2)-(85,5))
        │   │           ├── locals: []
        │   │           ├── module_keyword_loc: (83,2)-(83,8) = "module"
        │   │           ├── constant_path:
        │   │           │   @ ConstantReadNode (location: (83,9)-(83,10))
        │   │           │   └── name: :Y
        │   │           ├── body:
        │   │           │   @ StatementsNode (location: (84,4)-(84,10))
        │   │           │   └── body: (length: 1)
        │   │           │       └── @ ConstantWriteNode (location: (84,4)-(84,10))
        │   │           │           ├── name: :Z
        │   │           │           ├── name_loc: (84,4)-(84,5) = "Z"
        │   │           │           ├── value:
        │   │           │           │   @ IntegerNode (location: (84,8)-(84,10))
        │   │           │           │   ├── flags: decimal
        │   │           │           │   └── value: 42
        │   │           │           └── operator_loc: (84,6)-(84,7) = "="
        │   │           ├── end_keyword_loc: (85,2)-(85,5) = "end"
        │   │           └── name: :Y
        │   ├── end_keyword_loc: (86,0)-(86,3) = "end"
        │   └── name: :X
        └── @ CallNode (location: (89,0)-(92,1))
            ├── flags: ignore_visibility
            ├── receiver: ∅
            ├── call_operator_loc: ∅
            ├── name: :x
            ├── message_loc: (89,0)-(89,1) = "x"
            ├── opening_loc: (89,1)-(89,2) = "("
            ├── arguments:
            │   @ ArgumentsNode (location: (90,0)-(91,6))
            │   ├── flags: ∅
            │   └── arguments: (length: 2)
            │       ├── @ SymbolNode (location: (90,0)-(90,6))
            │       │   ├── flags: forced_us_ascii_encoding
            │       │   ├── opening_loc: (90,0)-(90,1) = ":"
            │       │   ├── value_loc: (90,1)-(90,6) = "line2"
            │       │   ├── closing_loc: ∅
            │       │   └── unescaped: "line2"
            │       └── @ SymbolNode (location: (91,0)-(91,6))
            │           ├── flags: forced_us_ascii_encoding
            │           ├── opening_loc: (91,0)-(91,1) = ":"
            │           ├── value_loc: (91,1)-(91,6) = "line3"
            │           ├── closing_loc: ∅
            │           └── unescaped: "line3"
            ├── closing_loc: (92,0)-(92,1) = ")"
            └── block: ∅