[Xy-pic] problem with broken curved double arrows

[Jürgen Koslowski]

Hello,

If I have a curved double arrow that I want to interupt for a label
(rather than placing the label at its side), the second half of the
arrow disappears.  This happens in the matrix environment as well as
in general.  The following example displays this behaviour under
xy-pic 3.7.

-- Juergen

\input xy.tex
\xyoption{matrix}
\xyoption{arrow}
\xyoption{curve}
\xyoption{dvips}
\xyoption{ps}

$$
\xymatrix{
  X
		\ar@/_4 ex/[rr]|e
		\ar@/^4 ex/@{=>}[rr]|f
&&Y
}
$$

$$
\xy ;<10 pt,0 pt>:
  (00,0)*+{A}="A";
  (10,0)*+{B}="B";
\ar@/_4 ex/|e "A";"B"
\ar@/^4 ex/@{=>}|f "A";"B"
\endxy
$$
\bye

-- 
Juergen Koslowski               If I don't see you no more on this world
ITI, TU Braunschweig               I'll meet you on the next one
koslowj@iti.cs.tu-bs.de               and don't be late!
http://www.iti.cs.tu-bs.de/~koslowj      Jimi Hendrix (Voodoo Child, SR)