@ ProgramNode (location: (0...41))
├── locals: [:c, :d]
└── statements:
    @ StatementsNode (location: (0...41))
    └── body: (length: 2)
        ├── @ LocalVariableWriteNode (location: (0...11))
        │   ├── name: :c
        │   ├── depth: 0
        │   ├── name_loc: (0...1) = "c"
        │   ├── value:
        │   │   @ StringNode (location: (4...11))
        │   │   ├── opening_loc: (4...11) = "<<'CCC'"
        │   │   ├── content_loc: (12...30) = "line2\nline3\nline4\n"
        │   │   ├── closing_loc: (30...34) = "CCC\n"
        │   │   └── unescaped: "line2\nline3\nline4\n"
        │   └── operator_loc: (2...3) = "="
        └── @ LocalVariableWriteNode (location: (35...41))
            ├── name: :d
            ├── depth: 0
            ├── name_loc: (35...36) = "d"
            ├── value:
            │   @ IntegerNode (location: (39...41))
            │   └── flags: decimal
            └── operator_loc: (37...38) = "="
