[ANNOUNCE] GHC 8.2.1 release candidate 2

Ben Gamari ben at well-typed.com
Tue May 16 02:47:17 UTC 2017

Hello everyone,

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


This is the second of what will likely be either two or three release
candidates leading up the final 8.2.1 release. This release will

  * 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

This candidate fixes most of the issues present in release candidate
one including,

 * #13233: typePrimRep panic while compiling GHC with profiling enabled
 * #13509: type error involving unboxed tuples
 * #13426: compile-time memory-usage regression
 * #13560: Windows binary distributions carry absolute paths to toolchain
 * #13585: Control.Lens.Wrapped.ala causes compiler panic
 * #13623: Join points produce bad code for stream fusion
As always, please let us know if you have difficulty. Thanks to everyone
who has contributed!

Happy testing,

- Ben
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