For nodes, draw takes a picture argument, but edges draw does not

[jimhefferon]

Thank you for the very useful software. I believe this is a bug: I want to draw a number of related graphs, so I want to put them in a single file. I can use

picture p1;
node(n1, n2);
draw(p1, n1, n2);

but I cannot use

draw(p1, (n1--n2));

I get this error:

parsetree.asy: 98.5: no matching function 'draw(picture pic, edge, edge, edge, edge, edge, edge, edge, edge, edge, edge, edge, edge, edge, edge, edge)'

Regards,
Jim