
#13068: GHC should not allow modules to define instances of abstract type classes
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Reporter: ezyang | Owner: (none)
Type: bug | Status: patch
Priority: low | Milestone: 8.2.1
Component: Compiler (Type | Version: 8.1
checker) |
Resolution: | Keywords: backpack
Operating System: Unknown/Multiple | Architecture:
Type of failure: GHC accepts | Unknown/Multiple
invalid program | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s): Phab:D3254
Wiki Page: |
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Comment (by Edward Z. Yang