[GHC] #13772: Cannot put HasCallStack on instances
GHC
ghc-devs at haskell.org
Thu Jun 1 22:22:04 UTC 2017
#13772: Cannot put HasCallStack on instances
-------------------------------------+-------------------------------------
Reporter: augustss | Owner: (none)
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 8.0.1
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
| Unknown/Multiple
Type of failure: None/Unknown | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s):
Wiki Page: |
-------------------------------------+-------------------------------------
Comment (by simonpj):
You can put implicit-parameter constraints on the methods, but not on the
instance. If the instance had implicit-parameter constraints it'd become
voisible exactly where the constraint was solved. So currently it's by
design.
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13772#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
More information about the ghc-tickets
mailing list