[1 of 3] Processing p
  [1 of 2] Compiling H[sig]           ( p/H.hsig, nothing )
  [2 of 2] Compiling M                ( p/M.hs, nothing )

bkpfail25.bkp:7:18: warning: [-Wmissing-methods (in -Wdefault)]
    • No explicit implementation for
        ‘fmap’
    • In the instance declaration for ‘Functor T’
[2 of 3] Processing q
  Instantiating q
  [1 of 1] Compiling H                ( q/H.hs, bkpfail25.out/q/H.o )
[3 of 3] Processing r
  Instantiating r
  [1 of 1] Including p[H=q:H]
    Instantiating p[H=q:H]
    [1 of 2] Compiling H[sig]           ( p/H.hsig, bkpfail25.out/p/p-D5Mg3foBSCrDbQDKH4WGSG/H.o )

bkpfail25.bkp:12:9: error:
    • Type constructor ‘T’ has conflicting definitions in the module
      and its hsig file
      Main module: type T :: * -> *
                   type T a = a
      Hsig file:  type role T nominal
                  type T :: * -> *
                  data T a
    • while checking that q:H implements signature H in p[H=q:H]