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| author | Richard Eisenberg <eir@cis.upenn.edu> | 2013-08-02 15:47:03 +0100 |
|---|---|---|
| committer | Richard Eisenberg <eir@cis.upenn.edu> | 2013-08-02 15:47:03 +0100 |
| commit | e8aa8ccba0c40884765281b21ff8f4411802dd41 (patch) | |
| tree | e29e041226a8cb34a1aeca77f824b22db5a9be0f /compiler/utils/GraphBase.hs | |
| parent | 303d3de9b52f67b9234f94d0e77e0933ca572ce7 (diff) | |
| download | haskell-e8aa8ccba0c40884765281b21ff8f4411802dd41.tar.gz | |
Implement "roles" into GHC.
Roles are a solution to the GeneralizedNewtypeDeriving type-safety
problem.
Roles were first described in the "Generative type abstraction" paper,
by Stephanie Weirich, Dimitrios Vytiniotis, Simon PJ, and Steve Zdancewic.
The implementation is a little different than that paper. For a quick
primer, check out Note [Roles] in Coercion. Also see
http://ghc.haskell.org/trac/ghc/wiki/Roles
and
http://ghc.haskell.org/trac/ghc/wiki/RolesImplementation
For a more formal treatment, check out docs/core-spec/core-spec.pdf.
This fixes Trac #1496, #4846, #7148.
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