Use U+2018 instead of U+201B quote mark in compiler messages

This matches GCC's choice of Unicode quotation marks (i.e. U+2018 and U+2019)
and therefore looks more familiar on the console. This addresses #2507.

Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>

1 files changed, 7 insertions, 7 deletions

diff --git a/testsuite/tests/gadt/rw.stderr b/testsuite/tests/gadt/rw.stderr
index 9273dbd27a..82b1986e54 100644
--- a/testsuite/tests/gadt/rw.stderr
+++ b/testsuite/tests/gadt/rw.stderr
@@ -1,20 +1,20 @@
 
 rw.hs:14:47:
-    Couldn't match expected type ‛a’ with actual type ‛Int’
-      ‛a’ is a rigid type variable bound by
+    Couldn't match expected type ‘a’ with actual type ‘Int’
+      ‘a’ is a rigid type variable bound by
           the type signature for writeInt :: T a -> IORef a -> IO ()
           at rw.hs:12:12
     Relevant bindings include
       ref :: IORef a (bound at rw.hs:13:12)
       v :: T a (bound at rw.hs:13:10)
       writeInt :: T a -> IORef a -> IO () (bound at rw.hs:13:1)
-    In the second argument of ‛writeIORef’, namely ‛(1 :: Int)’
+    In the second argument of ‘writeIORef’, namely ‘(1 :: Int)’
     In the expression: writeIORef ref (1 :: Int)
     In a case alternative: ~(Li x) -> writeIORef ref (1 :: Int)
 
 rw.hs:19:51:
-    Couldn't match type ‛a’ with ‛Bool’
-      ‛a’ is a rigid type variable bound by
+    Couldn't match type ‘a’ with ‘Bool’
+      ‘a’ is a rigid type variable bound by
           the type signature for readBool :: T a -> IORef a -> IO ()
           at rw.hs:16:12
     Expected type: a -> Bool
@@ -23,5 +23,5 @@ rw.hs:19:51:
       ref :: IORef a (bound at rw.hs:17:12)
       v :: T a (bound at rw.hs:17:10)
       readBool :: T a -> IORef a -> IO () (bound at rw.hs:17:1)
-    In the second argument of ‛(.)’, namely ‛not’
-    In the second argument of ‛(>>=)’, namely ‛(print . not)’
+    In the second argument of ‘(.)’, namely ‘not’
+    In the second argument of ‘(>>=)’, namely ‘(print . not)’