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