Update output

testsuite/tests/ghc-regress/typecheck/should_compile/T2494.stderr

 
-T2494.hs:12:13:
+T2494.hs:15:13:
     Couldn't match expected type `a' against inferred type `b'
       `a' is a rigid type variable bound by
-          the type signature for `f' at T2494.hs:10:45
+          the type signature for `f' at T2494.hs:13:45
       `b' is a rigid type variable bound by
-          the type signature for `g' at T2494.hs:11:45
+          the type signature for `g' at T2494.hs:14:45
       Expected type: Maybe (m a)
       Inferred type: Maybe (m b)
     In the first argument of `foo', namely `g'
     In the second argument of `foo', namely `(foo g x)'
 
-T2494.hs:12:29:
+T2494.hs:15:29:
     Couldn't match expected type `a' against inferred type `b'
       `a' is a rigid type variable bound by
-          the type signature for `f' at T2494.hs:10:45
+          the type signature for `f' at T2494.hs:13:45
       `b' is a rigid type variable bound by
-          the type signature for `g' at T2494.hs:11:45
+          the type signature for `g' at T2494.hs:14:45
       Expected type: Maybe (m a)
       Inferred type: Maybe (m b)
     In the second argument of `(.)', namely `g'
     In the first argument of `foo', namely `(f . g)'
 
-T2494.hs:12:32:
+T2494.hs:15:32:
     Couldn't match expected type `b' against inferred type `a'
       `b' is a rigid type variable bound by
-          the type signature for `g' at T2494.hs:11:45
+          the type signature for `g' at T2494.hs:14:45
       `a' is a rigid type variable bound by
-          the type signature for `f' at T2494.hs:10:45
+          the type signature for `f' at T2494.hs:13:45
       Expected type: Maybe b
       Inferred type: Maybe a
     In the second argument of `foo', namely `x'