[commit: testsuite] master: Test Trac #7959 (c746681)

[Simon Peyton Jones]

Repository : ssh://darcs.haskell.org//srv/darcs/testsuite

On branch  : master

https://github.com/ghc/testsuite/commit/c746681e68b1f85584493bd2d543e867eaa672c5

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

commit c746681e68b1f85584493bd2d543e867eaa672c5
Author: Krzysztof Gogolewski <krz.gogolewski at gmail.com>
Date:   Mon Jun 3 17:08:35 2013 +0200

    Test Trac #7959

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

 tests/deriving/should_fail/T7959.hs     |    6 ++++++
 tests/deriving/should_fail/T7959.stderr |    8 ++++++++
 tests/deriving/should_fail/all.T        |    1 +
 3 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/tests/deriving/should_fail/T7959.hs b/tests/deriving/should_fail/T7959.hs
new file mode 100644
index 0000000..a798bb0
--- /dev/null
+++ b/tests/deriving/should_fail/T7959.hs
@@ -0,0 +1,6 @@
+{-# LANGUAGE NullaryTypeClasses, StandaloneDeriving #-}
+module T7959 where
+
+class A
+deriving instance A
+data B deriving A
diff --git a/tests/deriving/should_fail/T7959.stderr b/tests/deriving/should_fail/T7959.stderr
new file mode 100644
index 0000000..0e805a6
--- /dev/null
+++ b/tests/deriving/should_fail/T7959.stderr
@@ -0,0 +1,8 @@
+
+T7959.hs:5:1:
+    Cannot derive instances for nullary classes
+    In the stand-alone deriving instance for ‛A’
+
+T7959.hs:6:17:
+    Cannot derive instances for nullary classes
+    In the data declaration for ‛B’
diff --git a/tests/deriving/should_fail/all.T b/tests/deriving/should_fail/all.T
index ad96a11..c2d304e 100644
--- a/tests/deriving/should_fail/all.T
+++ b/tests/deriving/should_fail/all.T
@@ -40,3 +40,4 @@ test('T1133A',
      run_command,
      ['$MAKE --no-print-directory -s T1133A'])
 test('T5863a', normal, compile_fail, [''])
+test('T7959', normal, compile_fail, [''])