@ ProgramNode (location: (0...15))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...15))
    └── body: (length: 1)
        └── @ ArrayNode (location: (0...15))
            ├── elements: (length: 3)
            │   ├── @ SymbolNode (location: (3...4))
            │   │   ├── opening_loc: ∅
            │   │   ├── value_loc: (3...4) = "a"
            │   │   ├── closing_loc: ∅
            │   │   └── unescaped: "a"
            │   ├── @ InterpolatedSymbolNode (location: (5...12))
            │   │   ├── opening_loc: ∅
            │   │   ├── parts: (length: 2)
            │   │   │   ├── @ StringNode (location: (5...6))
            │   │   │   │   ├── opening_loc: ∅
            │   │   │   │   ├── content_loc: (5...6) = "b"
            │   │   │   │   ├── closing_loc: ∅
            │   │   │   │   └── unescaped: "b"
            │   │   │   └── @ EmbeddedStatementsNode (location: (6...12))
            │   │   │       ├── opening_loc: (6...8) = "\#{"
            │   │   │       ├── statements:
            │   │   │       │   @ StatementsNode (location: (8...11))
            │   │   │       │   └── body: (length: 1)
            │   │   │       │       └── @ CallNode (location: (8...11))
            │   │   │       │           ├── receiver:
            │   │   │       │           │   @ IntegerNode (location: (8...9))
            │   │   │       │           │   └── flags: decimal
            │   │   │       │           ├── call_operator_loc: ∅
            │   │   │       │           ├── message_loc: (9...10) = "+"
            │   │   │       │           ├── opening_loc: ∅
            │   │   │       │           ├── arguments:
            │   │   │       │           │   @ ArgumentsNode (location: (10...11))
            │   │   │       │           │   └── arguments: (length: 1)
            │   │   │       │           │       └── @ IntegerNode (location: (10...11))
            │   │   │       │           │           └── flags: decimal
            │   │   │       │           ├── closing_loc: ∅
            │   │   │       │           ├── block: ∅
            │   │   │       │           ├── flags: ∅
            │   │   │       │           └── name: "+"
            │   │   │       └── closing_loc: (11...12) = "}"
            │   │   └── closing_loc: ∅
            │   └── @ SymbolNode (location: (13...14))
            │       ├── opening_loc: ∅
            │       ├── value_loc: (13...14) = "c"
            │       ├── closing_loc: ∅
            │       └── unescaped: "c"
            ├── opening_loc: (0...3) = "%I("
            └── closing_loc: (14...15) = ")"
