The following code gives an error, my goal is to draw 4 different arrows but only three functions successfully.

The error log shows

metapost > initializing number mode 'scaled'

metapost log >

metapost log > loading metafun, including plain.mp version 1.004 for metafun iv and xl

metapost log >

metapost log > >> unknown path D

metapost log > ! Isolated expression.

metapost log > <to be read again>

metapost log > :

metapost log > <*> ... :=(12cm, -1cm)--(11cm, -1cm); path D ; D :

metapost log > =(4cm, -1cm)--(3cm, -1cm)...

metapost log >

And the code is as follows

\startMPcode

path A ; A :=(0cm, -1cm)--(1cm, -1cm);

path B ; B :=(13.5cm, -1cm)--(14.5cm, -1cm);

path C ; C :=(12cm, -1cm)--(11cm, -1cm);

path D ; D : =(4cm, -1cm)--(3cm, -1cm);

drawarrow A; drawarrow B; drawarrow C ; drawarrow D ;

\stopMPcode

Unless I uncomment D it gives the above error.

Mysterious issue

/Janne