DefinitionTree {
    definitions: [
        Constant(
            ConstantDefinition {
                comments: CommentGroup {
                    comments: [],
                },
                const: Span {
                    line: 1,
                    column: 1,
                    position: 0,
                },
                entries: CommaSeparated {
                    inner: [
                        ConstantDefinitionEntry {
                            name: Identifier {
                                span: Span {
                                    line: 1,
                                    column: 7,
                                    position: 6,
                                },
                                value: "a",
                            },
                            equals: Span {
                                line: 1,
                                column: 9,
                                position: 8,
                            },
                            value: Identifier(
                                Identifier {
                                    span: Span {
                                        line: 1,
                                        column: 11,
                                        position: 10,
                                    },
                                    value: "\null",
                                },
                            ),
                        },
                    ],
                    commas: [],
                },
                semicolon: Span {
                    line: 1,
                    column: 16,
                    position: 15,
                },
            },
        ),
    ],
    eof: Span {
        line: 1,
        column: 17,
        position: 16,
    },
}