@ ProgramNode (location: (1,0)-(24,0))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(24,0))
    └── body: (length: 6)
        ├── @ CallNode (location: (1,0)-(4,0))
        │   ├── flags: ∅
        │   ├── receiver:
        │   │   @ StringNode (location: (1,0)-(1,3))
        │   │   ├── flags: ∅
        │   │   ├── opening_loc: (1,0)-(1,3) = "<<A"
        │   │   ├── content_loc: (2,0)-(2,0) = ""
        │   │   ├── closing_loc: (2,0)-(3,0) = "A\n"
        │   │   └── unescaped: ""
        │   ├── call_operator_loc: ∅
        │   ├── name: :+
        │   ├── message_loc: (1,3)-(1,4) = "+"
        │   ├── opening_loc: ∅
        │   ├── arguments:
        │   │   @ ArgumentsNode (location: (1,4)-(4,0))
        │   │   ├── flags: ∅
        │   │   └── arguments: (length: 1)
        │   │       └── @ StringNode (location: (1,4)-(4,0))
        │   │           ├── flags: ∅
        │   │           ├── opening_loc: (1,4)-(2,0) = "%\n"
        │   │           ├── content_loc: (3,0)-(3,0) = ""
        │   │           ├── closing_loc: (3,0)-(4,0) = "\n"
        │   │           └── unescaped: ""
        │   ├── closing_loc: ∅
        │   └── block: ∅
        ├── @ CallNode (location: (5,0)-(8,0))
        │   ├── flags: ∅
        │   ├── receiver:
        │   │   @ StringNode (location: (5,0)-(5,3))
        │   │   ├── flags: ∅
        │   │   ├── opening_loc: (5,0)-(5,3) = "<<A"
        │   │   ├── content_loc: (6,0)-(6,0) = ""
        │   │   ├── closing_loc: (6,0)-(7,0) = "A\n"
        │   │   └── unescaped: ""
        │   ├── call_operator_loc: ∅
        │   ├── name: :+
        │   ├── message_loc: (5,3)-(5,4) = "+"
        │   ├── opening_loc: ∅
        │   ├── arguments:
        │   │   @ ArgumentsNode (location: (5,4)-(8,0))
        │   │   ├── flags: ∅
        │   │   └── arguments: (length: 1)
        │   │       └── @ RegularExpressionNode (location: (5,4)-(8,0))
        │   │           ├── flags: forced_us_ascii_encoding
        │   │           ├── opening_loc: (5,4)-(6,0) = "%r\n"
        │   │           ├── content_loc: (6,0)-(6,0) = ""
        │   │           ├── closing_loc: (7,0)-(8,0) = "\n"
        │   │           └── unescaped: ""
        │   ├── closing_loc: ∅
        │   └── block: ∅
        ├── @ CallNode (location: (9,0)-(12,0))
        │   ├── flags: ∅
        │   ├── receiver:
        │   │   @ StringNode (location: (9,0)-(9,3))
        │   │   ├── flags: ∅
        │   │   ├── opening_loc: (9,0)-(9,3) = "<<A"
        │   │   ├── content_loc: (10,0)-(10,0) = ""
        │   │   ├── closing_loc: (10,0)-(11,0) = "A\n"
        │   │   └── unescaped: ""
        │   ├── call_operator_loc: ∅
        │   ├── name: :+
        │   ├── message_loc: (9,3)-(9,4) = "+"
        │   ├── opening_loc: ∅
        │   ├── arguments:
        │   │   @ ArgumentsNode (location: (9,4)-(12,0))
        │   │   ├── flags: ∅
        │   │   └── arguments: (length: 1)
        │   │       └── @ StringNode (location: (9,4)-(12,0))
        │   │           ├── flags: ∅
        │   │           ├── opening_loc: (9,4)-(10,0) = "%q\n"
        │   │           ├── content_loc: (11,0)-(11,0) = ""
        │   │           ├── closing_loc: (11,0)-(12,0) = "\n"
        │   │           └── unescaped: ""
        │   ├── closing_loc: ∅
        │   └── block: ∅
        ├── @ CallNode (location: (13,0)-(16,0))
        │   ├── flags: ∅
        │   ├── receiver:
        │   │   @ StringNode (location: (13,0)-(13,3))
        │   │   ├── flags: ∅
        │   │   ├── opening_loc: (13,0)-(13,3) = "<<A"
        │   │   ├── content_loc: (14,0)-(14,0) = ""
        │   │   ├── closing_loc: (14,0)-(15,0) = "A\n"
        │   │   └── unescaped: ""
        │   ├── call_operator_loc: ∅
        │   ├── name: :+
        │   ├── message_loc: (13,3)-(13,4) = "+"
        │   ├── opening_loc: ∅
        │   ├── arguments:
        │   │   @ ArgumentsNode (location: (13,4)-(16,0))
        │   │   ├── flags: ∅
        │   │   └── arguments: (length: 1)
        │   │       └── @ StringNode (location: (13,4)-(16,0))
        │   │           ├── flags: ∅
        │   │           ├── opening_loc: (13,4)-(14,0) = "%Q\n"
        │   │           ├── content_loc: (15,0)-(15,0) = ""
        │   │           ├── closing_loc: (15,0)-(16,0) = "\n"
        │   │           └── unescaped: ""
        │   ├── closing_loc: ∅
        │   └── block: ∅
        ├── @ CallNode (location: (17,0)-(20,0))
        │   ├── flags: ∅
        │   ├── receiver:
        │   │   @ StringNode (location: (17,0)-(17,3))
        │   │   ├── flags: ∅
        │   │   ├── opening_loc: (17,0)-(17,3) = "<<A"
        │   │   ├── content_loc: (18,0)-(18,0) = ""
        │   │   ├── closing_loc: (18,0)-(19,0) = "A\n"
        │   │   └── unescaped: ""
        │   ├── call_operator_loc: ∅
        │   ├── name: :+
        │   ├── message_loc: (17,3)-(17,4) = "+"
        │   ├── opening_loc: ∅
        │   ├── arguments:
        │   │   @ ArgumentsNode (location: (17,4)-(20,0))
        │   │   ├── flags: ∅
        │   │   └── arguments: (length: 1)
        │   │       └── @ SymbolNode (location: (17,4)-(20,0))
        │   │           ├── flags: forced_us_ascii_encoding
        │   │           ├── opening_loc: (17,4)-(18,0) = "%s\n"
        │   │           ├── value_loc: (18,0)-(18,0) = ""
        │   │           ├── closing_loc: (19,0)-(20,0) = "\n"
        │   │           └── unescaped: ""
        │   ├── closing_loc: ∅
        │   └── block: ∅
        └── @ CallNode (location: (21,0)-(24,0))
            ├── flags: ∅
            ├── receiver:
            │   @ StringNode (location: (21,0)-(21,3))
            │   ├── flags: ∅
            │   ├── opening_loc: (21,0)-(21,3) = "<<A"
            │   ├── content_loc: (22,0)-(22,0) = ""
            │   ├── closing_loc: (22,0)-(23,0) = "A\n"
            │   └── unescaped: ""
            ├── call_operator_loc: ∅
            ├── name: :+
            ├── message_loc: (21,3)-(21,4) = "+"
            ├── opening_loc: ∅
            ├── arguments:
            │   @ ArgumentsNode (location: (21,4)-(24,0))
            │   ├── flags: ∅
            │   └── arguments: (length: 1)
            │       └── @ XStringNode (location: (21,4)-(24,0))
            │           ├── flags: ∅
            │           ├── opening_loc: (21,4)-(22,0) = "%x\n"
            │           ├── content_loc: (22,0)-(22,0) = ""
            │           ├── closing_loc: (23,0)-(24,0) = "\n"
            │           └── unescaped: ""
            ├── closing_loc: ∅
            └── block: ∅