@ ProgramNode (location: (0...15))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...15))
    └── body: (length: 1)
        └── @ InterpolatedSymbolNode (location: (0...15))
            ├── opening_loc: (0...2) = ":\""
            ├── parts: (length: 3)
            │   ├── @ StringNode (location: (2...5))
            │   │   ├── opening_loc: ∅
            │   │   ├── content_loc: (2...5) = "foo"
            │   │   ├── closing_loc: ∅
            │   │   └── unescaped: "foo"
            │   ├── @ EmbeddedStatementsNode (location: (5...11))
            │   │   ├── opening_loc: (5...7) = "\#{"
            │   │   ├── statements:
            │   │   │   @ StatementsNode (location: (7...10))
            │   │   │   └── body: (length: 1)
            │   │   │       └── @ CallNode (location: (7...10))
            │   │   │           ├── receiver: ∅
            │   │   │           ├── call_operator_loc: ∅
            │   │   │           ├── message_loc: (7...10) = "bar"
            │   │   │           ├── opening_loc: ∅
            │   │   │           ├── arguments: ∅
            │   │   │           ├── closing_loc: ∅
            │   │   │           ├── block: ∅
            │   │   │           ├── flags: variable_call
            │   │   │           └── name: "bar"
            │   │   └── closing_loc: (10...11) = "}"
            │   └── @ StringNode (location: (11...14))
            │       ├── opening_loc: ∅
            │       ├── content_loc: (11...14) = "baz"
            │       ├── closing_loc: ∅
            │       └── unescaped: "baz"
            └── closing_loc: (14...15) = "\""
