If 'transformers' purposely has orphan instances, shouldn't we switch off the
warnings about them?
Simon
"/opt/ghc/bin/ghc" -hisuf hi -osuf o -hcsuf hc -static -O -H64m -Wall
-package-db libraries/bootstrapping.conf -this-unit-id transformers-0.5.6.2
-hide-all-packages -package-env - -i -ilibraries/transformers/.
-ilibraries/transformers/dist-boot/build
-Ilibraries/transformers/dist-boot/build
-ilibraries/transformers/dist-boot/build/./autogen
-Ilibraries/transformers/dist-boot/build/./autogen -Ilibraries/transformers/.
-optP-include
-optPlibraries/transformers/dist-boot/build/./autogen/cabal_macros.h
-package-id base-4.14.1.0 -XHaskell98 -no-user-package-db -rtsopts
-fno-warn-unused-matches -fno-warn-unused-imports -fno-warn-deprecated-flags
-outputdir libraries/transformers/dist-boot/build -c
libraries/transformers/./Control/Applicative/Lift.hs -o
libraries/transformers/dist-boot/build/Control/Applicative/Lift.o
libraries/transformers/Control/Monad/Trans/Error.hs:98:1: warning: [-Worphans]
Orphan instance: instance [safe] Error e => Alternative (Either e)
To avoid this
move the instance declaration to the module of the class or of the
type, or
wrap the type with a newtype and declare the instance on the new type.
|
98 | instance (Error e) => Alternative (Either e) where
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^...
libraries/transformers/Control/Monad/Trans/Error.hs:103:1: warning: [-Worphans]
Orphan instance: instance [safe] Error e => MonadPlus (Either e)
To avoid this
move the instance declaration to the module of the class or of the
type, or
wrap the type with a newtype and declare the instance on the new type.
|
103 | instance (Error e) => MonadPlus (Either e) where
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^...
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