Comments (7)
The error messages I get from that module look like this:
Bug.hs:41:49:
Could not deduce (Typeable typ) arising from a use of ‘getSafePut’
from the context (SafeCopy typ)
bound by the instance declaration
at Bug.hs:(32,10)-(39,31)
In a stmt of a 'do' block: safePut_IxSetT1typtyp <- getSafePut
In the second argument of ‘($)’, namely
‘do { safePut_IxSetT1typtyp <- getSafePut;
safePut_IxSetT1typtyp arg;
return () }’
In the expression:
contain
$ do { safePut_IxSetT1typtyp <- getSafePut;
safePut_IxSetT1typtyp arg;
return () }
from safecopy.
I just noticed that the context of the data declaration is added to the SafeCopy declaration, so you can fix this by adding context to T2. However, the DatatypeContexts feature is considered a bad thing.
from safecopy.
I'm closing this because I'm no longer certain the DatatypeContexts directive is necessary.
from safecopy.
Ok, I've updated the example http://lpaste.net/135048 to show that it does require DatatypeContexts to build. Reopening.
from safecopy.
This is now fixed.
from safecopy.
No, its not.
from safecopy.
http://lpaste.net/146499 is a file that demonstrates the issue.
from safecopy.
Related Issues (20)
- Can't migrate when you have 2 consecutive fields of the same type and then one of them changes type HOT 2
- Loose time package constraint HOT 1
- Test suite failure with time-1.6.0.1 (duplicate instances) HOT 1
- Unnecessary constraint in generated SafeCopy instance HOT 3
- extended_extension comment is actually the extended_base comment
- s/unkown/unknown/ HOT 1
- Cannot build on ghc 8.2 HOT 1
- template-haskell constraint for ghc-8.4.1 HOT 2
- Better error messages
- errorTypeName method has sensible default implementation HOT 1
- incompatible with GHC 8.6 HOT 4
- safecopy added dependency on generic-data which is only GHC >= 8.0 HOT 6
- Fix compilation with template-haskell-2.15 (GHC-8.8) HOT 4
- Need GGetCopy and GPutCopy instances for V1 HOT 1
- Hello world is not complete HOT 2
- Need changes for GHC-9.0 HOT 3
- PolyKinds breaks phantom newtype deriving with non obvious error message HOT 2
- Support GHC 9.4
- deriveSafeCopy not working for mutual recursive data-types in GHC 9.2.4 HOT 3
- Support GHC 9.6 HOT 1
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from safecopy.