Print constraints in quotes (#21167)

This patch improves the uniformity of error message formatting by
printing constraints in quotes, as we do for types.

Fix #21167

1 files changed, 22 insertions, 22 deletions

diff --git a/testsuite/tests/deriving/should_fail/drvfail-foldable-traversable1.stderr b/testsuite/tests/deriving/should_fail/drvfail-foldable-traversable1.stderr
index aa115cd10e..f475a3ea5d 100644
--- a/testsuite/tests/deriving/should_fail/drvfail-foldable-traversable1.stderr
+++ b/testsuite/tests/deriving/should_fail/drvfail-foldable-traversable1.stderr
@@ -1,26 +1,26 @@
 
-drvfail-foldable-traversable1.hs:9:23:
-    No instance for (Functor Trivial1)
-      arising from the 'deriving' clause of a data type declaration
-    Possible fix:
-      use a standalone 'deriving instance' declaration,
-        so you can specify the instance context yourself
-    When deriving the instance for (Traversable Trivial1)
+drvfail-foldable-traversable1.hs:9:23: error:
+    • No instance for ‘Functor Trivial1’
+        arising from the 'deriving' clause of a data type declaration
+      Possible fix:
+        use a standalone 'deriving instance' declaration,
+          so you can specify the instance context yourself
+    • When deriving the instance for (Traversable Trivial1)
 
-drvfail-foldable-traversable1.hs:13:22:
-    No instance for (Foldable Trivial2)
-      arising from the 'deriving' clause of a data type declaration
-    Possible fix:
-      use a standalone 'deriving instance' declaration,
-        so you can specify the instance context yourself
-    When deriving the instance for (Traversable Trivial2)
+drvfail-foldable-traversable1.hs:13:22: error:
+    • No instance for ‘Foldable Trivial2’
+        arising from the 'deriving' clause of a data type declaration
+      Possible fix:
+        use a standalone 'deriving instance' declaration,
+          so you can specify the instance context yourself
+    • When deriving the instance for (Traversable Trivial2)
 
-drvfail-foldable-traversable1.hs:17:22:
-    Can't make a derived instance of ‘Foldable Infinite’:
-      Constructor ‘Infinite’ must not contain function types
-    In the data declaration for ‘Infinite’
+drvfail-foldable-traversable1.hs:17:22: error:
+    • Can't make a derived instance of ‘Foldable Infinite’:
+        Constructor ‘Infinite’ must not contain function types
+    • In the data declaration for ‘Infinite’
 
-drvfail-foldable-traversable1.hs:21:22:
-    Can't make a derived instance of ‘Traversable (Cont r)’:
-      Constructor ‘Cont’ must not contain function types
-    In the data declaration for ‘Cont’
+drvfail-foldable-traversable1.hs:21:22: error:
+    • Can't make a derived instance of ‘Traversable (Cont r)’:
+        Constructor ‘Cont’ must not contain function types
+    • In the data declaration for ‘Cont’