anchor.diff:  
     language-c_0_7_0 = overrideCabal super.language-c_0_7_0 (drv: {
       ## Unmerged.  PR: https://github.com/visq/language-c/pull/45
  -    ## 
  +    ##
       ##     Ambiguous occurrence ‘<>’
       ##     It could refer to either ‘Prelude.<>’,
       ##                              imported from ‘Prelude’ at src/Language/C/Pretty.hs:15:8-24
  
positive.code: 
    haskell-gi-base = overrideCabal super.haskell-gi-base (drv: {
      ## Upstreamed, awaiting a Hackage release
      ## 
      ## Setup: Encountered missing dependencies:
      ## haskell-gi-base ==0.21.*
      ## cannot build derivation ‘/nix/store/b3d6yr1rzk4hpzg87yk4n5i4321i824f-gi-cairo-1.0.14.drv’: 1 dependencies couldn't be built
  
negative.code: 
    simple-reflect = overrideCabal super.simple-reflect (drv: {
      ## Upstreamed, awaiting a Hackage release
      ##
      ##     • No instance for (Semigroup Expr)
      ##         arising from the superclasses of an instance declaration
      ##     • In the instance declaration for ‘Monoid Expr’
  