5. Release notes for version 8.4.3 — Glasgow Haskell Compiler 8.4.4 User's Guide

# Glasgow Haskell Compiler User's Guide

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# 5. Release notes for version 8.4.3

## 5.1. Highlights

This is a bug-fix release resolving several regressions introduced in 8.4.1.

The highlights, since the 8.4.2 release, are:

- A bug (Trac #15068) causing GHC to produce assembler that would be rejected by some versions of GNU Binutils, has been fixed.
- `GHC.Compact.compact` now properly handles `SmallArray`s (Trac #13857)
- A bug (Trac #15038) resulting in memory corruption and crashes in some uses of unboxed sums has been fixed.
- GHC now logs a message when an environment file is loaded (Trac #15145).

## 5.2. Full details

In addition to the highlights listed above, this release resolves a number of other issues, described below.

### 5.2.1. Compiler

No changes beyond those listed in Highlights.

### 5.2.2. Runtime system

- A bug causing aggressive potentially resulting in crashes when (`nursery chunks`) are used with a changing capability count has been fixed.

### 5.2.3. Template Haskell

No changes.

### 5.2.4. `ghc` library

No changes.

### 5.2.5. `base` library

- Version bumped to 4.11.1.0 to account for the addition of `GHC.IO.FixIOException`
- Add the `readFieldHash` function to `GHC.Read` which behaves like `readField`, but for a field that ends with a `#` symbol.

### 5.2.6. `integer-gmp` library

No changes.

### 5.2.7. Build system

No changes.

## 5.3. Included libraries

The package database provided with this distribution also contains a number of packages other than GHC itself. See the changelogs provided with these packages for further change information.

Package | Version | Reason for inclusion
--- | --- | ---
ghc | 8.4.4 | The compiler itself
Cabal | 2.2.0.1 | Dependency of `ghc-pkg` utility
Win32 | 2.6.1.0 | Dependency of `ghc` library
array | 0.5.2.0 | Dependency of `ghc` library
base | 4.11.1.0 | Core library
binary | 0.8.5.1 | Dependency of `ghc` library
bytestring | 0.10.8.2 | Deppendency of `ghc` library
containers | 0.5.11.0 | Dependency of `ghc` library
deepseq | 1.4.3.0 | Dependency of `ghc` library
directory | 1.3.1.5 | Dependency of `ghc` library
filepath | 1.4.2 | Dependency of `ghc` library
ghc-boot | 8.4.4 | Internal compiler library
ghc-compact | 0.1.0.0 | Core library
ghc-prim | 0.5.2.0 | Core library
ghci | 8.4.4 | The REPL interface
haskeline | 0.7.4.2 | Dependency of `ghci` executable
hpc | 0.6.0.3 | Dependency of `hpc` executable
integer-gmp | 1.0.2.0 | Core library
mtl | 2.2.2 | Dependency of `Cabal` library
parsec | 3.1.13.0 | Dependency of `Cabal` library
process | 1.6.3.0 | Dependency of `ghc` library
template-haskell | 2.13.0.0 | Core library
text | 1.2.3.1 | Dependency of `Cabal` library
time | 1.8.0.2 | Dependency of `ghc` library
transformers | 0.5.5.0 | Dependency of `ghc` library
unix | 2.7.2.2 | Dependency of `ghc` library
xhtml | 3000.2.2.1 | Dependency of `haddock` executable

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