@ ProgramNode (location: (1,0)-(2,66))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(2,66))
    └── body: (length: 1)
        └── @ InterpolatedStringNode (location: (1,0)-(2,66))
            ├── flags: ∅
            ├── opening_loc: ∅
            ├── parts: (length: 2)
            │   ├── @ StringNode (location: (1,0)-(1,62))
            │   │   ├── flags: forced_utf8_encoding, frozen
            │   │   ├── opening_loc: (1,0)-(1,1) = "\""
            │   │   ├── content_loc: (1,1)-(1,61) = "\\xE3\\xD3\\x8B\\xE3\\x83\\xBC\\x83\\xE3\\x83\\xE3\\x82\\xB3\\xA3\\x82\\x99"
            │   │   ├── closing_loc: (1,61)-(1,62) = "\""
            │   │   └── unescaped: "\xE3Ӌー\x83\xE3\x83コ\xA3\x82\x99"
            │   └── @ StringNode (location: (2,8)-(2,66))
            │       ├── flags: forced_utf8_encoding, frozen
            │       ├── opening_loc: (2,8)-(2,9) = "\""
            │       ├── content_loc: (2,9)-(2,65) = "\\xE3\\x83\\xB3\\xE3\\x83\\x8F\\xE3\\x82\\x9A\\xC3\\xBD;foo@bar.com"
            │       ├── closing_loc: (2,65)-(2,66) = "\""
            │       └── unescaped: "ンパý;foo@bar.com"
            └── closing_loc: ∅