@ ProgramNode (location: (1,0)-(1,26))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(1,26))
    └── body: (length: 1)
        └── @ InterpolatedStringNode (location: (1,0)-(1,26))
            ├── opening_loc: (1,0)-(1,3) = "%Q["
            ├── parts: (length: 3)
            │   ├── @ StringNode (location: (1,3)-(1,11))
            │   │   ├── flags: ∅
            │   │   ├── opening_loc: ∅
            │   │   ├── content_loc: (1,3)-(1,11) = "before ["
            │   │   ├── closing_loc: ∅
            │   │   └── unescaped: "before ["
            │   ├── @ EmbeddedStatementsNode (location: (1,11)-(1,18))
            │   │   ├── opening_loc: (1,11)-(1,13) = "\#{"
            │   │   ├── statements:
            │   │   │   @ StatementsNode (location: (1,13)-(1,17))
            │   │   │   └── body: (length: 1)
            │   │   │       └── @ CallNode (location: (1,13)-(1,17))
            │   │   │           ├── flags: variable_call, ignore_visibility
            │   │   │           ├── receiver: ∅
            │   │   │           ├── call_operator_loc: ∅
            │   │   │           ├── name: :nest
            │   │   │           ├── message_loc: (1,13)-(1,17) = "nest"
            │   │   │           ├── opening_loc: ∅
            │   │   │           ├── arguments: ∅
            │   │   │           ├── closing_loc: ∅
            │   │   │           └── block: ∅
            │   │   └── closing_loc: (1,17)-(1,18) = "}"
            │   └── @ StringNode (location: (1,18)-(1,25))
            │       ├── flags: ∅
            │       ├── opening_loc: ∅
            │       ├── content_loc: (1,18)-(1,25) = "] after"
            │       ├── closing_loc: ∅
            │       └── unescaped: "] after"
            └── closing_loc: (1,25)-(1,26) = "]"
