Allow "fn" as abbreviation for "function" in ItemType syntax

[michaelhkay]

The syntax for inline functions is, by design, similar to the syntax for function tests. So it's confusing that you can abbreviate "function" to "fn" in the first case but not the second.

Open question: what about "declare function" in the XQuery prolog? My instinct is to leave that as it is.

[ChristianGruen]

The syntax for inline functions is, by design, similar to the syntax for function tests. So it's confusing that you can abbreviate "function" to "fn" in the first case but not the second.

Sounds good.

Open question: what about "declare function" in the XQuery prolog? My instinct is to leave that as it is.

I agree; we shouldn’t trigger the desire for other abbrv.s like decl(are) var(iable).

[michaelhkay]

Closed by #1197