[metapost] dependencies bug

[Vadim Radionov]

Dear all,

My colleague found a bug in Metapost 1.803 which I would lile to report.
 In the following minimal example, showdependencies shows something
inappropriate, which gives "This can't happen (dep)" error later.  But if I
move the third s-relation after setting z[4,6,8], everything works fine.

Vadim

def s(expr A,B,C,D)=
D-C=B-A=((B-D) rotated 90)
enddef;

beginfig(1);
s(z3,z4,z7,z8);
s(z4,z5,z6,z11);
s(z6,z12,z8,z10);

showdependencies;

z4 = (0,0);
z6 = (1cm,0);
z8 = (0,1cm);


endfig;
bye
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