Haskell: GHC 9.14.1-rc3 is now available

NewsBot · 2 December 2025 13:26

A new Haskell blog post/announcement has been posted!

GHC 9.14.1-rc3 is now available

zubin - 2025-12-01

The GHC developers are very pleased to announce the availability of the third release candidate of GHC 9.14.1. Binary distributions, source distributions, and documentation are available at downloads.haskell.org.

The changes from the second release candidate are:

Fix RTS segfaults in certain situations (#26495)

Fix use after free on windows due to a linker optimisation introduced in an earlier RC (#26613)

GHC 9.14 will bring a number of new features and improvements, including:

Significant improvements in specialisation:

The SPECIALISE pragma now allows use of type application syntax

The SPECIALISE pragma can be used to specialise for expression arguments as well as type arguments.

Specialisation is now considerably more reliable in the presence of newtypes

Significant GHCi improvements including:

Correctness and performance improvements in the bytecode interpreter

Features in the GHCi debugger

Support for multiple home units in GHCi

Implementation of the Explicit Level Imports proposal

RequiredTypeArguments can now be used in more contexts

SSE/AVX2 support in the x86 native code generator backend

A major update of the Windows toolchain and improved compatibility with macOS Tahoe

… and many more

A full accounting of changes can be found in the http://haskell.org/ghc/blog/20251201-ghc-9.14.1-rc3-released.html