GND and Safe Haskell

Richard Eisenberg eir at
Mon Nov 4 16:04:51 UTC 2013

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.


On Nov 4, 2013, at 10:59 AM, Roman Cheplyaka <roma at> wrote:

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