@ ProgramNode (location: (1,0)-(11,8))
├── flags: ∅
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(11,8))
    ├── flags: ∅
    └── body: (length: 3)
        ├── @ StringNode (location: (1,0)-(1,8))
        │   ├── flags: newline
        │   ├── opening_loc: (1,0)-(1,8) = "<<'HERE'"
        │   ├── content_loc: (2,0)-(4,0) = "foo\nbar\n"
        │   ├── closing_loc: (4,0)-(5,0) = "HERE\n"
        │   └── unescaped: "foo\nbar\n"
        ├── @ StringNode (location: (6,0)-(6,6))
        │   ├── flags: newline
        │   ├── opening_loc: (6,0)-(6,6) = "<<HERE"
        │   ├── content_loc: (7,0)-(9,0) = "foo\nbar\n"
        │   ├── closing_loc: (9,0)-(10,0) = "HERE\n"
        │   └── unescaped: "foo\nbar\n"
        └── @ XStringNode (location: (11,0)-(11,8))
            ├── flags: newline
            ├── opening_loc: (11,0)-(11,8) = "<<`HERE`"
            ├── content_loc: (12,0)-(14,0) = "foo\nbar\n"
            ├── closing_loc: (14,0)-(15,0) = "HERE\n"
            └── unescaped: "foo\nbar\n"
