This is METAFONT, WAITS Version 0.6 (preloaded base=plain 84.12.15)  18 DEC 1984 01:12
**danger
(DANGER.MF[MF,DEK]
Dangerous bend sign [127]
! MF upgrade -- Please change `edges' to `picture' in all your files.
<to be read again> 
                   ;
<argument> ...rade(("edges"),("picture"));
                                          expandafter.def.scantokens(...
hide->gobble(begingroup(TEXT0)
                              ;endgroup)
nameswitch->...(EXPR0)&"="&(EXPR1))enddef)
                                          scantokens(EXPR1)
l.54 edges
           dbend; dbend=currentpicture;
? 
Negative ditto
currentpicture:=currentpicture-dbend;=>currentpicture:=currentpicture-dbend;

endchar.=>endchar.
[126])
*end
Output written on DANGER.GF[MF,DEK] (2 characters, 11732 bytes).