3. Release notes for version 8.4.2 — Glasgow Haskell Compiler 8.6.1 User's Guide

# Glasgow Haskell Compiler User's Guide

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# 3. Release notes for version 8.4.2

TODO

## 3.1. Highlights

The highlights, since the 8.4.1 release, are:

- TODO

## 3.2. Full details

### 3.2.1. Language

- Fix a regression in which derived `Read` instances for record data types with field names ending with `#` (by way of `-XMagicHash`) would no longer parse valid output.

### 3.2.2. Compiler

### 3.2.3. Runtime system

### 3.2.4. Template Haskell

### 3.2.5. `ghc` library

### 3.2.6. `base` library

- Add the `readFieldHash` function to `GHC.Read` which behaves like `readField`, but for a field that ends with a `#` symbol.

### 3.2.7. `integer-gmp` library

- Define `powModSecInteger`, a “secure” version of `powModInteger` using the `mpz_powm_sec` function.

### 3.2.8. Build system

## 3.3. 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 | 8.6.1 | The compiler itself
Cabal | 2.4.0.1 | Dependency of `ghc-pkg` utility
Win32 | 2.6.1.0 | Dependency of `ghc` library
array | 0.5.2.0 | Dependency of `ghc` library
base | 4.12.0.0 | Core library
binary | 0.8.6.0 | Dependency of `ghc` library
bytestring | 0.10.8.2 | Deppendency of `ghc` library
containers | 0.6.0.1 | Dependency of `ghc` library
deepseq | 1.4.4.0 | Dependency of `ghc` library
directory | 1.3.3.0 | Dependency of `ghc` library
filepath | 1.4.2.1 | Dependency of `ghc` library
ghc-boot | 8.6.1 | Internal compiler library
ghc-compact | 0.1.0.0 | Core library
ghc-prim | 0.5.3 | Core library
ghci | 8.6.1 | The REPL interface
haskeline | 0.7.4.3 | 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 | 2.14.0.0 | 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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