[ANNOUNCE] GHC 8.2.1 release candidate 1

Ben Gamari ben at well-typed.com
Mon Apr 10 03:50:04 UTC 2017

Hello everyone,

The GHC team is very pleased to announce the first candidate of the
8.2.1 release of the Glasgow Haskell Compiler. Source and binary
distributions are available at


This is the first of a few release candidates leading up the final 8.2.1
release. This release will feature,

  * A new type-indexed Typeable implementation

  * The long awaited Backpack

  * Deriving strategies for disambiguating DeriveAnyClass,
    GeneralizedNewtypeDeriving, and stock mechanisms

  * Overloaded record fields

  * Improved compiler performance

  * Better code generation through more robust tracking of join points

  * Compact regions for more efficient garbage collection and serialization

  * Better support for machines with non-uniform memory architectures

  * More robust support for levity (e.g. RuntimeRep) polymorphism

  * A simple interface for streaming eventlog data from live processes

  * Further refinement of DWARF support

Unfortunately there are still a few known issues in this release,
including a few compiler panics (#13233, #13509) and a memory leak in
the simplifier (#13426) which may adversely affect heap sizes and
compilation time for some modules. This memory leak unfortunately made
it impossible to provide a 32-bit Windows distribution for this
candidate; this will be resolved in -rc2.

As always, please let us know if you have difficulty. Thanks to everyone
who has contributed to this release!

Happy testing,

- Ben

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