[metapost] Problem with quartercircle

[Pétiard François]

Hello

I have a problem : consider the file .mp

prologues:=1;
beginfig(1);
path qc,qd;

qc:=quartercircle scaled(4cm);
z0=point(1) of qc;
labels(0);
draw qc cutafter(z0);

qd:=quartercircle scaled(5cm);
z1=qd intersectionpoint((0,0)--(3cm,3cm));
labels(1);
draw qd cutafter(z1);

endfig;
end;

Why the second quartercircle isn't cut after z1 ?
Same problem with halfcircle and fullcircle.

F. Pétiard

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petiard.francois at free.fr