@ ProgramNode (location: (0...4))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...4))
    └── body: (length: 1)
        └── @ InterpolatedStringNode (location: (0...4))
            ├── opening_loc: (0...4) = "<<\"\""
            ├── parts: (length: 2)
            │   ├── @ EmbeddedStatementsNode (location: (5...9))
            │   │   ├── opening_loc: (5...7) = "\#{"
            │   │   ├── statements:
            │   │   │   @ StatementsNode (location: (7...8))
            │   │   │   └── body: (length: 1)
            │   │   │       └── @ CallNode (location: (7...8))
            │   │   │           ├── receiver: ∅
            │   │   │           ├── call_operator_loc: ∅
            │   │   │           ├── message_loc: (7...8) = "x"
            │   │   │           ├── opening_loc: ∅
            │   │   │           ├── arguments: ∅
            │   │   │           ├── closing_loc: ∅
            │   │   │           ├── block: ∅
            │   │   │           ├── flags: variable_call
            │   │   │           └── name: "x"
            │   │   └── closing_loc: (8...9) = "}"
            │   └── @ StringNode (location: (9...16))
            │       ├── opening_loc: ∅
            │       ├── content_loc: (9...16) = "\nblah2\n"
            │       ├── closing_loc: ∅
            │       └── unescaped: "\nblah2\n"
            └── closing_loc: (16...17) = "\n"
