anchor.diff:  identifier-syntax,2
   identifier?,2
   ieee-environment,2
  -if,2
  +if,4
   imag-part,2
   implementation-restriction-violation?,2
   implicit-exports,2
  
positive.code: acquire-lock,2
  add1,2
  alias,2
  and,2
  andmap,2
  angle,2
  annotation-expression,2
  
negative.code: ee-bind-key,2
  ee-compose,2
  ee-string-macro,2
  else,1
  enable-interrupts,2
  endianness,2
  engine-block,2
  