diff options
Diffstat (limited to 'testsuite/tests/partial-sigs/should_compile/T10403.stderr')
| -rw-r--r-- | testsuite/tests/partial-sigs/should_compile/T10403.stderr | 91 |
1 files changed, 66 insertions, 25 deletions
diff --git a/testsuite/tests/partial-sigs/should_compile/T10403.stderr b/testsuite/tests/partial-sigs/should_compile/T10403.stderr index bfd5367bcd..1a71a3c803 100644 --- a/testsuite/tests/partial-sigs/should_compile/T10403.stderr +++ b/testsuite/tests/partial-sigs/should_compile/T10403.stderr @@ -1,39 +1,80 @@ T10403.hs:15:7: warning: - Found hole ‘_’ with inferred constraints: Functor f - In the type signature for: + Found constraint wildcard ‘_’ standing for ‘Functor f’ + In the type signature: h1 :: _ => _ T10403.hs:15:12: warning: - Found type wildcard ‘_’ standing for ‘(a -> b) -> f a -> H f’ - Where: ‘b’ is a rigid type variable bound by + • Found type wildcard ‘_’ standing for ‘(a -> b) -> f a -> H f’ + Where: ‘b’ is a rigid type variable bound by the inferred type of h1 :: Functor f => (a -> b) -> f a -> H f at T10403.hs:17:1 - ‘a’ is a rigid type variable bound by + ‘a’ is a rigid type variable bound by the inferred type of h1 :: Functor f => (a -> b) -> f a -> H f at T10403.hs:17:1 - ‘f’ is a rigid type variable bound by + ‘f’ is a rigid type variable bound by the inferred type of h1 :: Functor f => (a -> b) -> f a -> H f at T10403.hs:17:1 - In the type signature for: - h1 :: _ => _ + • In the type signature: + h1 :: _ => _ + • Relevant bindings include + h1 :: (a -> b) -> f a -> H f (bound at T10403.hs:17:1) T10403.hs:19:7: warning: - Found type wildcard ‘_’ standing for ‘(a -> b) -> f a -> H f’ - Where: ‘b’ is a rigid type variable bound by - the inferred type of h2 :: Functor f => (a -> b) -> f a -> H f - at T10403.hs:21:1 - ‘a’ is a rigid type variable bound by - the inferred type of h2 :: Functor f => (a -> b) -> f a -> H f - at T10403.hs:21:1 - ‘f’ is a rigid type variable bound by - the inferred type of h2 :: Functor f => (a -> b) -> f a -> H f - at T10403.hs:21:1 - In the type signature for: - h2 :: _ + • Found type wildcard ‘_’ standing for ‘(a -> b) -> f0 a -> H f0’ + Where: ‘b’ is a rigid type variable bound by + the inferred type of h2 :: (a -> b) -> f0 a -> H f0 + at T10403.hs:22:1 + ‘a’ is a rigid type variable bound by + the inferred type of h2 :: (a -> b) -> f0 a -> H f0 + at T10403.hs:22:1 + ‘f0’ is an ambiguous type variable + • In the type signature: + h2 :: _ + • Relevant bindings include + h2 :: (a -> b) -> f0 a -> H f0 (bound at T10403.hs:22:1) + +T10403.hs:22:15: warning: + • Ambiguous type variable ‘f0’ arising from a use of ‘fmap’ + prevents the constraint ‘(Functor f0)’ from being solved. + Relevant bindings include + b :: f0 a (bound at T10403.hs:22:6) + h2 :: (a -> b) -> f0 a -> H f0 (bound at T10403.hs:22:1) + Probable fix: use a type annotation to specify what ‘f0’ should be. + These potential instances exist: + instance Functor IO -- Defined in ‘GHC.Base’ + instance Functor (B t) -- Defined at T10403.hs:10:10 + instance Functor I -- Defined at T10403.hs:6:10 + ...plus four others + (use -fprint-potential-instances to see them all) + • In the second argument of ‘(.)’, namely ‘fmap (const ())’ + In the expression: H . fmap (const ()) + In the expression: (H . fmap (const ())) (fmap f b) + +T10403.hs:28:8: warning: + • Couldn't match type ‘f0’ with ‘B t’ + because type variable ‘t’ would escape its scope + This (rigid, skolem) type variable is bound by + the type signature for: + app2 :: H (B t) + at T10403.hs:27:1-15 + Expected type: H (B t) + Actual type: H f0 + • In the expression: h2 (H . I) (B ()) + In an equation for ‘app2’: app2 = h2 (H . I) (B ()) + • Relevant bindings include + app2 :: H (B t) (bound at T10403.hs:28:1) -T10403.hs:21:1: warning: - No instance for (Functor f) - When checking that ‘h2’ has the inferred type - h2 :: forall (f :: * -> *) b a. (a -> b) -> f a -> H f - Probable cause: the inferred type is ambiguous +T10403.hs:28:20: warning: + • Couldn't match type ‘f0’ with ‘B t’ + because type variable ‘t’ would escape its scope + This (rigid, skolem) type variable is bound by + the type signature for: + app2 :: H (B t) + at T10403.hs:27:1-15 + Expected type: f0 () + Actual type: B t () + • In the second argument of ‘h2’, namely ‘(B ())’ + In the expression: h2 (H . I) (B ()) + • Relevant bindings include + app2 :: H (B t) (bound at T10403.hs:28:1) |