[
    FullOpeningTag(
        Span(
            1,
            1,
        ),
    ),
    Expression {
        expression: Heredoc {
            parts: [
                Literal(
                    "Hello, world!",
                ),
            ],
        },
        ending: Semicolon(
            Span(
                5,
                4,
            ),
        ),
    },
]
