[commit: ghc] master: Minor doc addition as requested in #12774. (815b837)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/815b837224fe8b7a43acebafcfc7b79a66311363/ghc

>---------------------------------------------------------------

commit 815b837224fe8b7a43acebafcfc7b79a66311363
Author: Edward Z. Yang <ezyang at cs.stanford.edu>
Date:   Thu Oct 27 18:09:40 2016 -0700

    Minor doc addition as requested in #12774.
    
    Signed-off-by: Edward Z. Yang <ezyang at cs.stanford.edu>


>---------------------------------------------------------------

815b837224fe8b7a43acebafcfc7b79a66311363
 testsuite/tests/backpack/cabal/bkpcabal02/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/testsuite/tests/backpack/cabal/bkpcabal02/Makefile b/testsuite/tests/backpack/cabal/bkpcabal02/Makefile
index 780102f..4856c2c 100644
--- a/testsuite/tests/backpack/cabal/bkpcabal02/Makefile
+++ b/testsuite/tests/backpack/cabal/bkpcabal02/Makefile
@@ -9,11 +9,14 @@ bkpcabal02: clean
 	$(MAKE) -s --no-print-directory clean
 	'$(GHC_PKG)' init tmp.d
 	'$(TEST_HC)' -v0 --make Setup
+	# Here is a working signature which this
+	# package can typecheck with
 	cp p/H.hsig.in1 p/H.hsig
 	# typecheck everything
 	$(CONFIGURE)
 	$(SETUP) build
 	$(SETUP) -v1 build
+	# This signature doesn't typecheck with the package
 	cp p/H.hsig.in2 p/H.hsig
 	! $(SETUP) build
 ifneq "$(CLEANUP)" ""