Newtype wrappers

[Johan Tibell]

On Mon, Jan 14, 2013 at 2:57 PM, Roman Cheplyaka <roma at ro-che.info> wrote:
> It's described here:
> http://hackage.haskell.org/trac/ghc/wiki/NewtypeWrappers

We seem to be talking past each other. There's a specific problem
related to type classes and invariants on data types mentioned earlier
on this thread. Simon's solution here seems to be that we only coerce
a structure from one newtype to the base type if the constructors are
exposed, hence my question if the code changes semantics due to adding
imports.