Wikimedia Bugzilla is closed!

Original bug title:
mw.message.parse() throws error for messages with pattern [[$1|abc]]
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How to reproduce:
mw.loader.using('mediawiki.jqueryMsg', function() {
    mw.messages.set({ 'abc': 'x[[$1|abc]]' });
    var html = mw.message('abc', 'a wikipage').parse();
    // html is now: abc: Parse error at position 1 in input: x[[$1|abc]]
});

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Expected result:
html === 'x<a href="/wiki/a_wikipage" title="a wikipage">abc</a>'