DefinitionTree {
    definitions: [
        Constant(
            ConstantDefinition {
                comments: CommentGroup {
                    comments: [],
                },
                const: Keyword {
                    value: "const",
                    position: 0,
                },
                type_definition: Literal(
                    Null(
                        LiteralNull {
                            comments: CommentGroup {
                                comments: [],
                            },
                            null: Keyword {
                                value: "null",
                                position: 6,
                            },
                        },
                    ),
                ),
                name: Identifier {
                    position: 11,
                    value: "a",
                },
                equals: 13,
                value: Identifier(
                    Identifier {
                        position: 15,
                        value: "\null",
                    },
                ),
                semicolon: 20,
            },
        ),
    ],
    eof: 21,
}