Roles makes GND completely type-safe. You cannot make unsafeCoerce using GND. However, you can look around abstractions with GND, both before and after roles -- roles weren't really designed to stop you from doing this. See #5498. Whether this is grounds to make GND unSafe is up to the designers of Safe Haskell. Richard On Nov 4, 2013, at 10:59 AM, Roman Cheplyaka wrote:

GHC HEAD still doesn't seem to recognize GND as Safe. I guess we can lift this restriction now that we have roles?

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