[1 of 6] Processing bar
  [1 of 1] Compiling A[sig]           ( bar/A.hsig, nothing )
[2 of 6] Processing foo
  [1 of 1] Compiling A[sig]           ( foo/A.hsig, nothing )
[3 of 6] Processing impl
  Instantiating impl
  [1 of 3] Compiling A1               ( impl/A1.hs, bkp05-out/impl/A1.o )
  [2 of 3] Compiling A2               ( impl/A2.hs, bkp05-out/impl/A2.o )
  [3 of 3] Compiling A                ( impl/A.hs, bkp05-out/impl/A.o )
[4 of 6] Processing barimpl
  Instantiating barimpl
  [1 of 2] Including impl
  [2 of 2] Including bar
    Instantiating bar(impl:A)
    [1 of 1] Compiling A[sig]           ( bar/A.hsig, nothing )

bkp05.bkp:2:5: error: Not in scope: type constructor or class ‘A’

bkp05.bkp:2:5: error: Not in scope: data constructor ‘A’