[ANNOUNCE] GHC 8.2.1 release candidate 2

[Ben Gamari]

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

    https://downloads.haskell.org/~ghc/8.2.1-rc2/

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
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

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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