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Diffstat (limited to 'docs/users_guide/8.2.1-notes.rst')
| -rw-r--r-- | docs/users_guide/8.2.1-notes.rst | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/docs/users_guide/8.2.1-notes.rst b/docs/users_guide/8.2.1-notes.rst index 2147dbca1d..c176a0867a 100644 --- a/docs/users_guide/8.2.1-notes.rst +++ b/docs/users_guide/8.2.1-notes.rst @@ -42,6 +42,20 @@ Compiler class instance using the :ghc-flag:`-XDerivingStrategies` language extension (see :ref:`deriving-strategies`). +- GHC now allows standalone deriving using :ghc-flag:`-XDeriveAnyClass` on + any data type, even if its data constructors are not in scope. This is + consistent with the fact that this code (in the presence of + :ghc-flag:`-XDeriveAnyClass`): :: + + deriving instance C T + + is exactly equivalent to: :: + + instance C T + + and the latter code has no restrictions about whether the data constructors + of ``T`` are in scope. + GHCi ~~~~ @@ -159,7 +173,7 @@ filepath ghc ~~~ -- +- ghc-boot ~~~~~~~~ |