/usr/share/texmf-texlive/metafont/misc/test.mf is in texlive-base 2009-15.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | cmchar "Lowercase thorn";
beginchar(oct"015",10u#+serif_fit#,asc_height#,desc_depth#);
italcorr .5x_height#*slant+min(.5curve#-.85u#,-.1u#);
adjust_fit(serif_fit#,0);
pickup tiny.nib; pos1(stem',0); pos2(stem,0);
pos0'(stem',0); pos0(stem,0); z0l=z0'l; x0'=x1; x0=x2;
lft x1l=hround(2.5u-.5stem'); top y1=h;
numeric edge; edge=rt x2r;
pickup fine.nib; pos3(if hefty:thin_join else: hair fi,180);
pos4(vair',90); pos5(curve,0); pos6(vair,-90);
rt x3l=1/3[rt x2,edge]; y3=1/8[bar_height,x_height];
x4l=w-.5(w-serif_fit)+.5u; top y4r=x_height+oo;
rt x5r=hround min(w-1.35u+.5curve,w-.6u); y5=.5x_height;
x6=x3; bot y6r=-oo;
(x,y4r)=whatever[z3l,z4l]; x4r:=min(x,.5[x5r,x4]);
filldraw stroke z3e{up}...{right}z4e&super_arc.e(4,5)
&z5e{down}...{5(x6-x5),y6-y5}z6e; % bowl
y0=ypart(((edge,h)--(edge,0))intersectionpoint(z3l{up}...{right}z4l));
pickup tiny.nib; bot y2=-d;
filldraw stroke z1e--z0'e--z0e--z2e; % stem
pickup crisp.nib; pos8(hair,0); pos7'(stem,0);
z7'=z2; x8l=x7'l; bot y8=0;
filldraw stroke z7'e--z8e; % point
if serifs: sloped_serif.l(1,0',a,1/3,jut,serif_drop); % upper serif
dish_serif(2,0,b,1/3,jut,c,1/3,0); fi % lower serif
penlabels(0,1,2,3,4,5,6,8); endchar;
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