@ ProgramNode (location: (0...20))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...20))
    └── body: (length: 1)
        └── @ InterpolatedStringNode (location: (0...20))
            ├── opening_loc: (0...2) = "%{"
            ├── parts: (length: 3)
            │   ├── @ StringNode (location: (2...5))
            │   │   ├── opening_loc: ∅
            │   │   ├── content_loc: (2...5) = " { "
            │   │   ├── closing_loc: ∅
            │   │   └── unescaped: " { "
            │   ├── @ EmbeddedStatementsNode (location: (5...16))
            │   │   ├── opening_loc: (5...7) = "\#{"
            │   │   ├── statements:
            │   │   │   @ StatementsNode (location: (8...14))
            │   │   │   └── body: (length: 1)
            │   │   │       └── @ InterpolatedStringNode (location: (8...14))
            │   │   │           ├── opening_loc: (8...9) = "\""
            │   │   │           ├── parts: (length: 1)
            │   │   │           │   └── @ EmbeddedStatementsNode (location: (9...13))
            │   │   │           │       ├── opening_loc: (9...11) = "\#{"
            │   │   │           │       ├── statements:
            │   │   │           │       │   @ StatementsNode (location: (11...12))
            │   │   │           │       │   └── body: (length: 1)
            │   │   │           │       │       └── @ IntegerNode (location: (11...12))
            │   │   │           │       │           └── flags: decimal
            │   │   │           │       └── closing_loc: (12...13) = "}"
            │   │   │           └── closing_loc: (13...14) = "\""
            │   │   └── closing_loc: (15...16) = "}"
            │   └── @ StringNode (location: (16...19))
            │       ├── opening_loc: ∅
            │       ├── content_loc: (16...19) = " } "
            │       ├── closing_loc: ∅
            │       └── unescaped: " } "
            └── closing_loc: (19...20) = "}"
