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The Glorious Glasgow Haskell Compilation System User’s Guide, Version 6.10.4 3 / 224 Unstable snapshots We may make snapshot releases of the HEAD available for download, and the latest sources are available from the darcs repositories. Unstable snapshot releases are named x.y.YYYYMMDD. where YYYYMMDD is the date of the sources from which the snapshot was built. For example, 6.7.20040225 would be a snapshot of the HEAD before the creation of the 6.8 branch. The value of __GLASGOW_HASKELL__ for a snapshot release is the integer xyy. You should never write any conditional code which tests for this value, however: since interfaces change on a day-to-day basis, and we don’t have finer granularity in the values of __GLASGOW_HASKELL__, you should only conditionally compile using predicates which test whether __GLASGOW_HASKELL__ is equal to, later than, or earlier than a given major release. The version number of your copy of GHC can be found by invoking ghc with the --version flag (see Section 4.5). 1.5 Release notes for version 6.10.4 6.10.4 is a bugfix release over 6.10.3. Very few changes have been made. They are listed below. • Fixed a segfault that could occur when calling mkWeakForeignEnv#. • Fixed a crash that could occur when calling unblock inside unsafePerformIO. • Stop primops such as readMutVar# being inlined, which can cause loss of referential transparency. • Fixed a bug that meant ctrl-C was ignored by processes we run with runProcess. • Fixed a bug where gcc processes run by GHC get killed on Mac OS X 10.4.11. • Fixed a bug where processes on Windows could hold file handles open after they had finished, leading to permission denied errors. • GHCi only uses Haskeline if the input is a terminal. • Fixed building with newer versions of MSYS binutils. 1.6 Release notes for version 6.10.3 6.10.3 is a bugfix release over 6.10.2. Very few changes have been make. They are listed below. • Control-C now works again in GHCi. In 6.10.2 it was ignored on some platforms due to the changes in signal handling. • GHCi uses Haskeline, rather than editline, for line editing. This fixes a crash when pressing control-C on some platforms, removes a C library dependency, and provides a better user interface. • It is now possible to build PDF and PS versions of the users guide, using dblatex. 1.7 Release notes for version 6.10.2 6.10.2 is a bugfix release over 6.10.1. Many bugs in the compiler, libraries and build system have been fixed. However, most library APIs have not changed, so code that worked with 6.10.1 should continue to work with 6.10.2. The notable bug fixes are listed below. • Setting stdin to NoBuffering now works on Windows. • System.FilePath.dropTrailingPathSeparator "\\" will now return "\\" rather than "". • The compatibility Control.OldException functions now catch new-style exceptions as DynExceptions.
The Glorious Glasgow Haskell Compilation System User’s Guide, Version 6.10.4 4 / 224 • It is now possible to create C finalizers which, unlike Haskell finalizers, are guaranteed to run. • There is now a +RTS -xm flag, which tells GHC where to try to allocate memory. • There is now a +RTS --machine-readable flag. Currently it only affects the +RTS -t output. • There are now more fields printed by the +RTS --info flag. • ghc-pkg will now complain if told to use a package.conf that doesn’t exist. • ghc-pkg check now looks for missing files (including .hi files), and reports all packages that are transitively broken. • The TypeFamilies extension now implies the RelaxedPolyRec extension. • We now ship with haddock 2.4.2 (was 2.3.0). • The version of base has been increased from 4.0.0.0 to 4.1.0.0. • The version of base(compat) has been increased from 3.0.3.0 to 3.0.3.1. • The version of Cabal has been increased from 1.6.0.1 to 1.6.0.3. • The version of containers has been increased from 0.2.0.0 to 0.2.0.1. • The version of directory has been increased from 1.0.0.2 to 1.0.0.3. • The version of extensible-exceptions has been increased from 0.1.0.0 to 0.1.0.1. • The version of filepath has been increased from 1.1.0.1 to 1.1.0.2. • The version of hpc has been increased from 0.5.0.2 to 0.5.0.3. • The version of integer-gmp has been increased from 0.1.0.0 to 0.1.0.1. • The version of old-time has been increased from 1.0.0.1 to 1.0.0.2. • The version of process has been increased from 1.0.1.0 to 1.0.1.1. • The version of syb has been increased from 0.1.0.0 to 0.1.0.1. • The version of template-haskell has been increased from 2.3.0.0 to 2.3.0.1. • The version of unix has been increased from 2.3.1.0 to 2.4.0.0. 1.8 Release notes for version 6.10.1 The significant changes to the various parts of the compiler are listed in the following sections. 1.8.1 User-visible compiler changes • The new QuasiQuotes language extension adds general quasi-quotation, as described in "Nice to be Quoted: Quasiquoting for Haskell" (Geoffrey Mainland, Haskell Workshop 2007). See Section 7.9.5 for more information. • The new ViewPatterns language extension allows "view patterns". The syntax for view patterns is expression -> pattern in a pattern. For more information, see Section 7.3.5. • GHC already supported (e op) postfix operators, but this support was enabled by default. Now you need to use the PostfixOperators language extension if you want it. See Section 7.3.10 for more information on postfix operators. • The new TransformListComp language extension enables implements generalised list comprehensions, as described in the paper "Comprehensive comprehensions" (Peyton Jones & Wadler, Haskell Workshop 2007). For more information see Section 7.3.8.
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