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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