[darcs-devel] [patch1904] use StandaloneDeriving for some Show instances
Ganesh Sittampalam
bugs at darcs.net
Mon Sep 2 22:19:36 UTC 2019
Ganesh Sittampalam <ganesh at earth.li> added the comment:
updated version without DerivingStrategies, will screen this one
1 patch for repository darcs-unstable at darcs.net:screened:
patch 52c6cb79d887ae79a5bfc9046022ca8512cffa30
Author: Ganesh Sittampalam <ganesh at earth.li>
Date: Mon Sep 2 23:19:00 BST 2019
* use StandaloneDeriving for some Show instances
This is possible in cases where all the directly included
patches are concrete types rather than type variables.
For example it works for
data Foo p wX wY where
Foo :: Named p wX wY -> Foo p wX wY
but not for
data Foo p wX wY where
Foo :: p wX wY -> Foo p wX wY
__________________________________
Darcs bug tracker <bugs at darcs.net>
<http://bugs.darcs.net/patch1904>
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