diff options
Diffstat (limited to 'docs/users_guide/8.12.1-notes.rst')
| -rw-r--r-- | docs/users_guide/8.12.1-notes.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/docs/users_guide/8.12.1-notes.rst b/docs/users_guide/8.12.1-notes.rst index 70bb901b07..5cd7131fac 100644 --- a/docs/users_guide/8.12.1-notes.rst +++ b/docs/users_guide/8.12.1-notes.rst @@ -18,6 +18,12 @@ Full details Language ~~~~~~~~ +* In obscure scenarios, GHC now rejects programs it previously accepted, but + with unhelpful types. For example, if (with ``-XPartialTypeSignatures``) you + were to write ``x :: forall (f :: forall a (b :: a -> Type). b _). f _``, GHC previously + would have accepted ``x``, but its type would have involved the mysterious ``Any`` + internal type family. Now, GHC rejects, explaining the situation. + Compiler ~~~~~~~~ |