[Vala] functions and null

[Pavol Klačanský <pavol klacansky com>]

Hi, why this code doesn't work

Item item = null;

parse_content(item);

parse_content(Item item) {
        stderr.printf("argh");
}

reports
** (process:674): CRITICAL **: xml_parser_parse_content: assertion
`item != NULL' failed

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