@ ProgramNode (location: (1,0)-(24,10))
├── locals: [:a, :h]
└── statements:
    @ StatementsNode (location: (1,0)-(24,10))
    └── body: (length: 24)
        ├── @ LocalVariableOperatorWriteNode (location: (1,0)-(1,6))
        │   ├── name_loc: (1,0)-(1,1) = "a"
        │   ├── operator_loc: (1,2)-(1,4) = "+="
        │   ├── value:
        │   │   @ IntegerNode (location: (1,5)-(1,6))
        │   │   └── flags: decimal
        │   ├── name: :a
        │   ├── operator: :+
        │   └── depth: 0
        ├── @ LocalVariableOperatorWriteNode (location: (2,0)-(2,6))
        │   ├── name_loc: (2,0)-(2,1) = "a"
        │   ├── operator_loc: (2,2)-(2,4) = "-="
        │   ├── value:
        │   │   @ IntegerNode (location: (2,5)-(2,6))
        │   │   └── flags: decimal
        │   ├── name: :a
        │   ├── operator: :-
        │   └── depth: 0
        ├── @ LocalVariableOperatorWriteNode (location: (3,0)-(3,7))
        │   ├── name_loc: (3,0)-(3,1) = "a"
        │   ├── operator_loc: (3,2)-(3,5) = "**="
        │   ├── value:
        │   │   @ IntegerNode (location: (3,6)-(3,7))
        │   │   └── flags: decimal
        │   ├── name: :a
        │   ├── operator: :**
        │   └── depth: 0
        ├── @ LocalVariableOperatorWriteNode (location: (4,0)-(4,6))
        │   ├── name_loc: (4,0)-(4,1) = "a"
        │   ├── operator_loc: (4,2)-(4,4) = "*="
        │   ├── value:
        │   │   @ IntegerNode (location: (4,5)-(4,6))
        │   │   └── flags: decimal
        │   ├── name: :a
        │   ├── operator: :*
        │   └── depth: 0
        ├── @ LocalVariableOperatorWriteNode (location: (5,0)-(5,6))
        │   ├── name_loc: (5,0)-(5,1) = "a"
        │   ├── operator_loc: (5,2)-(5,4) = "/="
        │   ├── value:
        │   │   @ IntegerNode (location: (5,5)-(5,6))
        │   │   └── flags: decimal
        │   ├── name: :a
        │   ├── operator: :/
        │   └── depth: 0
        ├── @ LocalVariableAndWriteNode (location: (6,0)-(6,7))
        │   ├── name_loc: (6,0)-(6,1) = "a"
        │   ├── operator_loc: (6,2)-(6,5) = "&&="
        │   ├── value:
        │   │   @ CallNode (location: (6,6)-(6,7))
        │   │   ├── flags: variable_call, ignore_visibility
        │   │   ├── receiver: ∅
        │   │   ├── call_operator_loc: ∅
        │   │   ├── name: :b
        │   │   ├── message_loc: (6,6)-(6,7) = "b"
        │   │   ├── opening_loc: ∅
        │   │   ├── arguments: ∅
        │   │   ├── closing_loc: ∅
        │   │   └── block: ∅
        │   ├── name: :a
        │   └── depth: 0
        ├── @ LocalVariableOrWriteNode (location: (7,0)-(7,7))
        │   ├── name_loc: (7,0)-(7,1) = "a"
        │   ├── operator_loc: (7,2)-(7,5) = "||="
        │   ├── value:
        │   │   @ IntegerNode (location: (7,6)-(7,7))
        │   │   └── flags: decimal
        │   ├── name: :a
        │   └── depth: 0
        ├── @ CallNode (location: (8,0)-(8,13))
        │   ├── flags: ∅
        │   ├── receiver:
        │   │   @ ParenthesesNode (location: (8,0)-(8,9))
        │   │   ├── body:
        │   │   │   @ StatementsNode (location: (8,1)-(8,8))
        │   │   │   └── body: (length: 1)
        │   │   │       └── @ LocalVariableOrWriteNode (location: (8,1)-(8,8))
        │   │   │           ├── name_loc: (8,1)-(8,2) = "a"
        │   │   │           ├── operator_loc: (8,3)-(8,6) = "||="
        │   │   │           ├── value:
        │   │   │           │   @ IntegerNode (location: (8,7)-(8,8))
        │   │   │           │   └── flags: decimal
        │   │   │           ├── name: :a
        │   │   │           └── depth: 0
        │   │   ├── opening_loc: (8,0)-(8,1) = "("
        │   │   └── closing_loc: (8,8)-(8,9) = ")"
        │   ├── call_operator_loc: (8,9)-(8,10) = "."
        │   ├── name: :bar
        │   ├── message_loc: (8,10)-(8,13) = "bar"
        │   ├── opening_loc: ∅
        │   ├── arguments: ∅
        │   ├── closing_loc: ∅
        │   └── block: ∅
        ├── @ CallNode (location: (9,0)-(9,17))
        │   ├── flags: attribute_write
        │   ├── receiver:
        │   │   @ ParenthesesNode (location: (9,0)-(9,10))
        │   │   ├── body:
        │   │   │   @ StatementsNode (location: (9,1)-(9,9))
        │   │   │   └── body: (length: 1)
        │   │   │       └── @ LocalVariableOrWriteNode (location: (9,1)-(9,9))
        │   │   │           ├── name_loc: (9,1)-(9,2) = "h"
        │   │   │           ├── operator_loc: (9,3)-(9,6) = "||="
        │   │   │           ├── value:
        │   │   │           │   @ HashNode (location: (9,7)-(9,9))
        │   │   │           │   ├── opening_loc: (9,7)-(9,8) = "{"
        │   │   │           │   ├── elements: (length: 0)
        │   │   │           │   └── closing_loc: (9,8)-(9,9) = "}"
        │   │   │           ├── name: :h
        │   │   │           └── depth: 0
        │   │   ├── opening_loc: (9,0)-(9,1) = "("
        │   │   └── closing_loc: (9,9)-(9,10) = ")"
        │   ├── call_operator_loc: ∅
        │   ├── name: :[]=
        │   ├── message_loc: (9,10)-(9,13) = "[k]"
        │   ├── opening_loc: (9,10)-(9,11) = "["
        │   ├── arguments:
        │   │   @ ArgumentsNode (location: (9,11)-(9,17))
        │   │   ├── flags: ∅
        │   │   └── arguments: (length: 2)
        │   │       ├── @ CallNode (location: (9,11)-(9,12))
        │   │       │   ├── flags: variable_call, ignore_visibility
        │   │       │   ├── receiver: ∅
        │   │       │   ├── call_operator_loc: ∅
        │   │       │   ├── name: :k
        │   │       │   ├── message_loc: (9,11)-(9,12) = "k"
        │   │       │   ├── opening_loc: ∅
        │   │       │   ├── arguments: ∅
        │   │       │   ├── closing_loc: ∅
        │   │       │   └── block: ∅
        │   │       └── @ CallNode (location: (9,16)-(9,17))
        │   │           ├── flags: variable_call, ignore_visibility
        │   │           ├── receiver: ∅
        │   │           ├── call_operator_loc: ∅
        │   │           ├── name: :v
        │   │           ├── message_loc: (9,16)-(9,17) = "v"
        │   │           ├── opening_loc: ∅
        │   │           ├── arguments: ∅
        │   │           ├── closing_loc: ∅
        │   │           └── block: ∅
        │   ├── closing_loc: (9,12)-(9,13) = "]"
        │   └── block: ∅
        ├── @ CallOperatorWriteNode (location: (10,0)-(10,8))
        │   ├── flags: ∅
        │   ├── receiver:
        │   │   @ LocalVariableReadNode (location: (10,0)-(10,1))
        │   │   ├── name: :a
        │   │   └── depth: 0
        │   ├── call_operator_loc: (10,1)-(10,2) = "."
        │   ├── message_loc: (10,2)-(10,3) = "b"
        │   ├── read_name: :b
        │   ├── write_name: :b=
        │   ├── operator: :+
        │   ├── operator_loc: (10,4)-(10,6) = "+="
        │   └── value:
        │       @ IntegerNode (location: (10,7)-(10,8))
        │       └── flags: decimal
        ├── @ CallOperatorWriteNode (location: (11,0)-(11,8))
        │   ├── flags: ∅
        │   ├── receiver:
        │   │   @ LocalVariableReadNode (location: (11,0)-(11,1))
        │   │   ├── name: :a
        │   │   └── depth: 0
        │   ├── call_operator_loc: (11,1)-(11,2) = "."
        │   ├── message_loc: (11,2)-(11,3) = "b"
        │   ├── read_name: :b
        │   ├── write_name: :b=
        │   ├── operator: :-
        │   ├── operator_loc: (11,4)-(11,6) = "-="
        │   └── value:
        │       @ IntegerNode (location: (11,7)-(11,8))
        │       └── flags: decimal
        ├── @ CallOperatorWriteNode (location: (12,0)-(12,9))
        │   ├── flags: ∅
        │   ├── receiver:
        │   │   @ LocalVariableReadNode (location: (12,0)-(12,1))
        │   │   ├── name: :a
        │   │   └── depth: 0
        │   ├── call_operator_loc: (12,1)-(12,2) = "."
        │   ├── message_loc: (12,2)-(12,3) = "b"
        │   ├── read_name: :b
        │   ├── write_name: :b=
        │   ├── operator: :**
        │   ├── operator_loc: (12,4)-(12,7) = "**="
        │   └── value:
        │       @ IntegerNode (location: (12,8)-(12,9))
        │       └── flags: decimal
        ├── @ CallOperatorWriteNode (location: (13,0)-(13,8))
        │   ├── flags: ∅
        │   ├── receiver:
        │   │   @ LocalVariableReadNode (location: (13,0)-(13,1))
        │   │   ├── name: :a
        │   │   └── depth: 0
        │   ├── call_operator_loc: (13,1)-(13,2) = "."
        │   ├── message_loc: (13,2)-(13,3) = "b"
        │   ├── read_name: :b
        │   ├── write_name: :b=
        │   ├── operator: :*
        │   ├── operator_loc: (13,4)-(13,6) = "*="
        │   └── value:
        │       @ IntegerNode (location: (13,7)-(13,8))
        │       └── flags: decimal
        ├── @ CallOperatorWriteNode (location: (14,0)-(14,8))
        │   ├── flags: ∅
        │   ├── receiver:
        │   │   @ LocalVariableReadNode (location: (14,0)-(14,1))
        │   │   ├── name: :a
        │   │   └── depth: 0
        │   ├── call_operator_loc: (14,1)-(14,2) = "."
        │   ├── message_loc: (14,2)-(14,3) = "b"
        │   ├── read_name: :b
        │   ├── write_name: :b=
        │   ├── operator: :/
        │   ├── operator_loc: (14,4)-(14,6) = "/="
        │   └── value:
        │       @ IntegerNode (location: (14,7)-(14,8))
        │       └── flags: decimal
        ├── @ CallAndWriteNode (location: (15,0)-(15,9))
        │   ├── flags: ∅
        │   ├── receiver:
        │   │   @ LocalVariableReadNode (location: (15,0)-(15,1))
        │   │   ├── name: :a
        │   │   └── depth: 0
        │   ├── call_operator_loc: (15,1)-(15,2) = "."
        │   ├── message_loc: (15,2)-(15,3) = "b"
        │   ├── read_name: :b
        │   ├── write_name: :b=
        │   ├── operator_loc: (15,4)-(15,7) = "&&="
        │   └── value:
        │       @ CallNode (location: (15,8)-(15,9))
        │       ├── flags: variable_call, ignore_visibility
        │       ├── receiver: ∅
        │       ├── call_operator_loc: ∅
        │       ├── name: :b
        │       ├── message_loc: (15,8)-(15,9) = "b"
        │       ├── opening_loc: ∅
        │       ├── arguments: ∅
        │       ├── closing_loc: ∅
        │       └── block: ∅
        ├── @ CallOrWriteNode (location: (16,0)-(16,9))
        │   ├── flags: ∅
        │   ├── receiver:
        │   │   @ LocalVariableReadNode (location: (16,0)-(16,1))
        │   │   ├── name: :a
        │   │   └── depth: 0
        │   ├── call_operator_loc: (16,1)-(16,2) = "."
        │   ├── message_loc: (16,2)-(16,3) = "b"
        │   ├── read_name: :b
        │   ├── write_name: :b=
        │   ├── operator_loc: (16,4)-(16,7) = "||="
        │   └── value:
        │       @ IntegerNode (location: (16,8)-(16,9))
        │       └── flags: decimal
        ├── @ IndexOperatorWriteNode (location: (17,0)-(17,9))
        │   ├── flags: ∅
        │   ├── receiver:
        │   │   @ LocalVariableReadNode (location: (17,0)-(17,1))
        │   │   ├── name: :a
        │   │   └── depth: 0
        │   ├── call_operator_loc: ∅
        │   ├── opening_loc: (17,1)-(17,2) = "["
        │   ├── arguments:
        │   │   @ ArgumentsNode (location: (17,2)-(17,3))
        │   │   ├── flags: ∅
        │   │   └── arguments: (length: 1)
        │   │       └── @ CallNode (location: (17,2)-(17,3))
        │   │           ├── flags: variable_call, ignore_visibility
        │   │           ├── receiver: ∅
        │   │           ├── call_operator_loc: ∅
        │   │           ├── name: :b
        │   │           ├── message_loc: (17,2)-(17,3) = "b"
        │   │           ├── opening_loc: ∅
        │   │           ├── arguments: ∅
        │   │           ├── closing_loc: ∅
        │   │           └── block: ∅
        │   ├── closing_loc: (17,3)-(17,4) = "]"
        │   ├── block: ∅
        │   ├── operator: :+
        │   ├── operator_loc: (17,5)-(17,7) = "+="
        │   └── value:
        │       @ IntegerNode (location: (17,8)-(17,9))
        │       └── flags: decimal
        ├── @ IndexOperatorWriteNode (location: (18,0)-(18,9))
        │   ├── flags: ∅
        │   ├── receiver:
        │   │   @ LocalVariableReadNode (location: (18,0)-(18,1))
        │   │   ├── name: :a
        │   │   └── depth: 0
        │   ├── call_operator_loc: ∅
        │   ├── opening_loc: (18,1)-(18,2) = "["
        │   ├── arguments:
        │   │   @ ArgumentsNode (location: (18,2)-(18,3))
        │   │   ├── flags: ∅
        │   │   └── arguments: (length: 1)
        │   │       └── @ CallNode (location: (18,2)-(18,3))
        │   │           ├── flags: variable_call, ignore_visibility
        │   │           ├── receiver: ∅
        │   │           ├── call_operator_loc: ∅
        │   │           ├── name: :b
        │   │           ├── message_loc: (18,2)-(18,3) = "b"
        │   │           ├── opening_loc: ∅
        │   │           ├── arguments: ∅
        │   │           ├── closing_loc: ∅
        │   │           └── block: ∅
        │   ├── closing_loc: (18,3)-(18,4) = "]"
        │   ├── block: ∅
        │   ├── operator: :-
        │   ├── operator_loc: (18,5)-(18,7) = "-="
        │   └── value:
        │       @ IntegerNode (location: (18,8)-(18,9))
        │       └── flags: decimal
        ├── @ IndexOperatorWriteNode (location: (19,0)-(19,10))
        │   ├── flags: ∅
        │   ├── receiver:
        │   │   @ LocalVariableReadNode (location: (19,0)-(19,1))
        │   │   ├── name: :a
        │   │   └── depth: 0
        │   ├── call_operator_loc: ∅
        │   ├── opening_loc: (19,1)-(19,2) = "["
        │   ├── arguments:
        │   │   @ ArgumentsNode (location: (19,2)-(19,3))
        │   │   ├── flags: ∅
        │   │   └── arguments: (length: 1)
        │   │       └── @ CallNode (location: (19,2)-(19,3))
        │   │           ├── flags: variable_call, ignore_visibility
        │   │           ├── receiver: ∅
        │   │           ├── call_operator_loc: ∅
        │   │           ├── name: :b
        │   │           ├── message_loc: (19,2)-(19,3) = "b"
        │   │           ├── opening_loc: ∅
        │   │           ├── arguments: ∅
        │   │           ├── closing_loc: ∅
        │   │           └── block: ∅
        │   ├── closing_loc: (19,3)-(19,4) = "]"
        │   ├── block: ∅
        │   ├── operator: :**
        │   ├── operator_loc: (19,5)-(19,8) = "**="
        │   └── value:
        │       @ IntegerNode (location: (19,9)-(19,10))
        │       └── flags: decimal
        ├── @ IndexOperatorWriteNode (location: (20,0)-(20,9))
        │   ├── flags: ∅
        │   ├── receiver:
        │   │   @ LocalVariableReadNode (location: (20,0)-(20,1))
        │   │   ├── name: :a
        │   │   └── depth: 0
        │   ├── call_operator_loc: ∅
        │   ├── opening_loc: (20,1)-(20,2) = "["
        │   ├── arguments:
        │   │   @ ArgumentsNode (location: (20,2)-(20,3))
        │   │   ├── flags: ∅
        │   │   └── arguments: (length: 1)
        │   │       └── @ CallNode (location: (20,2)-(20,3))
        │   │           ├── flags: variable_call, ignore_visibility
        │   │           ├── receiver: ∅
        │   │           ├── call_operator_loc: ∅
        │   │           ├── name: :b
        │   │           ├── message_loc: (20,2)-(20,3) = "b"
        │   │           ├── opening_loc: ∅
        │   │           ├── arguments: ∅
        │   │           ├── closing_loc: ∅
        │   │           └── block: ∅
        │   ├── closing_loc: (20,3)-(20,4) = "]"
        │   ├── block: ∅
        │   ├── operator: :*
        │   ├── operator_loc: (20,5)-(20,7) = "*="
        │   └── value:
        │       @ IntegerNode (location: (20,8)-(20,9))
        │       └── flags: decimal
        ├── @ IndexOperatorWriteNode (location: (21,0)-(21,9))
        │   ├── flags: ∅
        │   ├── receiver:
        │   │   @ LocalVariableReadNode (location: (21,0)-(21,1))
        │   │   ├── name: :a
        │   │   └── depth: 0
        │   ├── call_operator_loc: ∅
        │   ├── opening_loc: (21,1)-(21,2) = "["
        │   ├── arguments:
        │   │   @ ArgumentsNode (location: (21,2)-(21,3))
        │   │   ├── flags: ∅
        │   │   └── arguments: (length: 1)
        │   │       └── @ CallNode (location: (21,2)-(21,3))
        │   │           ├── flags: variable_call, ignore_visibility
        │   │           ├── receiver: ∅
        │   │           ├── call_operator_loc: ∅
        │   │           ├── name: :b
        │   │           ├── message_loc: (21,2)-(21,3) = "b"
        │   │           ├── opening_loc: ∅
        │   │           ├── arguments: ∅
        │   │           ├── closing_loc: ∅
        │   │           └── block: ∅
        │   ├── closing_loc: (21,3)-(21,4) = "]"
        │   ├── block: ∅
        │   ├── operator: :/
        │   ├── operator_loc: (21,5)-(21,7) = "/="
        │   └── value:
        │       @ IntegerNode (location: (21,8)-(21,9))
        │       └── flags: decimal
        ├── @ IndexAndWriteNode (location: (22,0)-(22,10))
        │   ├── flags: ∅
        │   ├── receiver:
        │   │   @ LocalVariableReadNode (location: (22,0)-(22,1))
        │   │   ├── name: :a
        │   │   └── depth: 0
        │   ├── call_operator_loc: ∅
        │   ├── opening_loc: (22,1)-(22,2) = "["
        │   ├── arguments:
        │   │   @ ArgumentsNode (location: (22,2)-(22,3))
        │   │   ├── flags: ∅
        │   │   └── arguments: (length: 1)
        │   │       └── @ CallNode (location: (22,2)-(22,3))
        │   │           ├── flags: variable_call, ignore_visibility
        │   │           ├── receiver: ∅
        │   │           ├── call_operator_loc: ∅
        │   │           ├── name: :b
        │   │           ├── message_loc: (22,2)-(22,3) = "b"
        │   │           ├── opening_loc: ∅
        │   │           ├── arguments: ∅
        │   │           ├── closing_loc: ∅
        │   │           └── block: ∅
        │   ├── closing_loc: (22,3)-(22,4) = "]"
        │   ├── block: ∅
        │   ├── operator_loc: (22,5)-(22,8) = "&&="
        │   └── value:
        │       @ CallNode (location: (22,9)-(22,10))
        │       ├── flags: variable_call, ignore_visibility
        │       ├── receiver: ∅
        │       ├── call_operator_loc: ∅
        │       ├── name: :b
        │       ├── message_loc: (22,9)-(22,10) = "b"
        │       ├── opening_loc: ∅
        │       ├── arguments: ∅
        │       ├── closing_loc: ∅
        │       └── block: ∅
        ├── @ IndexOrWriteNode (location: (23,0)-(23,10))
        │   ├── flags: ∅
        │   ├── receiver:
        │   │   @ LocalVariableReadNode (location: (23,0)-(23,1))
        │   │   ├── name: :a
        │   │   └── depth: 0
        │   ├── call_operator_loc: ∅
        │   ├── opening_loc: (23,1)-(23,2) = "["
        │   ├── arguments:
        │   │   @ ArgumentsNode (location: (23,2)-(23,3))
        │   │   ├── flags: ∅
        │   │   └── arguments: (length: 1)
        │   │       └── @ CallNode (location: (23,2)-(23,3))
        │   │           ├── flags: variable_call, ignore_visibility
        │   │           ├── receiver: ∅
        │   │           ├── call_operator_loc: ∅
        │   │           ├── name: :b
        │   │           ├── message_loc: (23,2)-(23,3) = "b"
        │   │           ├── opening_loc: ∅
        │   │           ├── arguments: ∅
        │   │           ├── closing_loc: ∅
        │   │           └── block: ∅
        │   ├── closing_loc: (23,3)-(23,4) = "]"
        │   ├── block: ∅
        │   ├── operator_loc: (23,5)-(23,8) = "||="
        │   └── value:
        │       @ IntegerNode (location: (23,9)-(23,10))
        │       └── flags: decimal
        └── @ CallOperatorWriteNode (location: (24,0)-(24,10))
            ├── flags: ∅
            ├── receiver:
            │   @ CallNode (location: (24,0)-(24,3))
            │   ├── flags: variable_call, ignore_visibility
            │   ├── receiver: ∅
            │   ├── call_operator_loc: ∅
            │   ├── name: :foo
            │   ├── message_loc: (24,0)-(24,3) = "foo"
            │   ├── opening_loc: ∅
            │   ├── arguments: ∅
            │   ├── closing_loc: ∅
            │   └── block: ∅
            ├── call_operator_loc: (24,3)-(24,4) = "."
            ├── message_loc: (24,4)-(24,5) = "A"
            ├── read_name: :A
            ├── write_name: :A=
            ├── operator: :+
            ├── operator_loc: (24,6)-(24,8) = "+="
            └── value:
                @ IntegerNode (location: (24,9)-(24,10))
                └── flags: decimal
