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["Paul J. Lucas" <862971@xxxxxxxxxxxxxxxxxx>]

// foo.xq

module namespace foo = "http://www.foo.com";;

declare function foo:f( $i as xs:integer ) external;

declare function foo:f( $i as xs:integer ) { 
  $i + 2 
};

// test.xq

import module namespace foo = "http://www.foo.com"; at "/tmp/foo.xq";
  
foo:f(1)

// result
</tmp/foo.xq>:3,9: Zorba error [zerr:ZXQP0008]: "{http://www.foo.com}f#1": function implementation not found; raised at /Users/pjl/src/flwor/zorba/repo/trunk/zorba/src/compiler/translator/translator.cpp:3328

If you reverse the order of the function declarations (put the external
one last), the query runs to completion without error and produces the
expected result of "3".

In either case, it should instead complain that the same function has
been multiply defined.

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https://bugs.launchpad.net/bugs/862971

Title:
  No error upon (almost) duplicate function declarations

Status in Zorba - The XQuery Processor:
  Incomplete

Bug description:
  If you declare two XQuery functions that have the same name and
  signature (arity) in the same file, but the first is declared
  "external" and the second one isn't, Zorba allows the second
  declaration. It should be reported as an error.

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