\starttext

\startMPpage

string texstring;

texstring :=3D "{\colored [r=3D0.00, g=3D0.00, = b=3D0.00]{\definebodyfont [9.0pt][rm][default=3DRegular at = 9.0pt]\switchtobodyfont [9.0pt]\setupinterlinespace [9.9pt]\tf E.g. = publish/ subscribe}}";

path parpath;

parpath :=3D

(238,-167.00010681152344)..controls (238,-167.00010681152344) = and (238,-167.00010681152344)

..(238,-167.00010681152344)..controls = (238,-166.60010673470143) and = (238,-166.20010665787942)

..(238,-165.80010658105741)..controls = (238,-165.40010643392299) and = (238,-165.00010628678857)

..(238,-164.60010613965414)..controls = (238,-164.2001060472048) and = (238,-163.80010595475545)

..(238,-163.40010586230611)..controls = (238,-155.56353466513065) and = (231.9683162849897,-149)

..(224.2552179837387,-149)..controls = (223.85521783436539,-149) and = (223.45521768499208,-149)

..(223.05521753561877,-149)..controls = (222.65521740514737,-149) and = (222.255217274676,-149)

..(221.8552171442046,-149)..controls = (221.45521705001735,-149) and = (221.0552169558301,-149)

..(220.65521686164286,-149)..controls = (220.25521665589685,-149) and = (219.85521645015083,-149)

..(219.45521624440482,-149)..controls = (219.05521631807508,-149) and = (218.65521639174534,-149)

..(218.2552164654156,-149)..controls = (217.85521724037432,-149) and = (217.45521801533303,-149)

..(217.05521879029175,-149)..controls = (216.6552203077878,-149) and = (216.25522182528385,-149)

..(215.85522334277991,-149)..controls = (215.45522405083273,-149) and = (215.05522475888554,-149)

..(214.65522546693836,-149)..controls = (214.25522550518758,-149) and = (213.8552255434368,-149)

..(213.45522558168602,-149)..controls = (213.0552253720042,-149) and = (212.65522516232238,-149)

..(212.25522495264056,-149)..controls = (211.8552248680295,-149) and = (211.45522478341843,-149)

..(211.05522469880736,-149)..controls = (210.65522456100436,-149) and = (210.25522442320135,-149)

..(209.85522428539835,-149)..controls = (209.45522414149036,-149) and = (209.05522399758237,-149)

..(208.65522385367439,-149)..controls = (200.95716230583835,-149) and = (195,-155.63452868682958)

..(195,-163.48966401016395)..controls = (195,-163.88966411101083) and = (195,-164.28966421185771)

..(195,-164.68966431270459)..controls = (195,-165.08966445890775) and = (195,-165.4896646051109)

..(195,-165.88966475131406)..controls = (195,-166.25981210471718) and = (195,-166.62995945812031)

..(195,-167.00010681152344);

picture pic;

pic :=3D lmt_followtext [

text =3D texstring,

path =3D parpath,

spread =3D false,

];

\stopMPpage

\stoptext

lmt_followtext crashes on this = code with:

metapost log > ! angle(0,0) is taken as = zero.

metapost log > = <for(1)> = ...0)]shifted(-wid/2,0)rotated(angle(ad))

metapost log > = = = shifted.ap;draw.pic[(EXPR0...

metapost = log > <argument> = ...caled0.5pt.withcolor.green;fi;endfor

metapost = log > = = = ;if((autoscaleupfollowtext...

metapost = log >

metapost = log > = image->...ture;currentpicture:=3Dnullpicture;(TEXT3)

metapost log > = = = ;currentpicture.if.str(SUF...

metapost = log >

metapost = log > = followtext->...b_n;setbounds.currentpicture.to.b;)

metapost log > = = = endgroup

metapost log > = <argument> = ...parameter"path"),getparameter"text")

metapost = log > = = = ;popparameters;

metapost log > = image->...ture;currentpicture:=3Dnullpicture;(TEXT3)

metapost log > = = = ;currentpicture.if.str(SUF...

metapost = log >

metapost = log > = lmt_do_followtext->...meter"text");popparameters;)

metapost log > = = = endgroup

metapost log > = <scantokens> lmt_do_followtext

metapost = log > = =

metapost log > <*> = ...exstring, path =3D parpath, spread =3D false, ]

metapost log > = = = ; ;

When I adapt the parameters that create parpath in my code, = other uses of lmt_followtext crash. The same combinations of text and = path so far haven=E2=80=99t crashed basic followtext().

I=E2=80=99ve run into = comparable situations in my own code where I had to add code to handle = the existence of a (0,0) direction (e.g. when I had two identical points = on a path, but that is not the case here). The above minimal example = triggers the failure.

G