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* Further simplify the story around minimum/maximumwip/D1229Joachim Breitner2015-09-071-25/+9
| | | | | | | | | | | | | | | | | | After I have found out that I should look at -ddump-prep and not -ddump-core, I noticed that these days, GHC is perfectly capeable of turning (the equivalent) of foldl to (the equivalent) of foldl' if the operation in question is strict. So instead of using rewrite rules to rewrite maximum to a strictMaximum for certain types, we simply use SPECIALIZE. This also marks maximum/minimum as INLINEABLE, so that client code can get similar specializations, hopefully even automatically. And inded, minimum applied to [Double] produces good code (although due to inlineing, not due to specialization, it seems). I checked (by looking at the core) that this still fixes #10788. Differential revision: https://phabricator.haskell.org/D1229
* SPECIALIZE strictMinimum for Int and IntegerJoachim Breitner2015-09-071-0/+4
| | | | | | | | This fixes a regression reported in #10788, where due to less inlining compared to earlier versions, we’d get worse code. With the SPECIALIZE, we get the good code, and moreover, the good code is in List.hs and _not_ inlined to the use site, so smaller code size and less compilation time.
* Make Data.List.foldr1 inlineJoachim Breitner2015-09-031-3/+5
| | | | | | | | | | Previously, foldr1 would be defiend recursively and thus not inline. This is bad, for example, when maximumBy has a strict comparison function: Before the BBP, it was implemented via foldl1, which inlined and yielded good code. With BBP, it goes via foldr1, so we better inline this as well. Fixes #10830. Differential Revision: https://phabricator.haskell.org/D1205
* Injective type familiesJan Stolarek2015-09-035-53/+142
| | | | | | | | | | | | | | | | | | | For details see #6018, Phab:D202 and the wiki page: https://ghc.haskell.org/trac/ghc/wiki/InjectiveTypeFamilies This patch also wires-in Maybe data type and updates haddock submodule. Test Plan: ./validate Reviewers: simonpj, goldfire, austin, bgamari Subscribers: mpickering, bgamari, alanz, thomie, goldfire, simonmar, carter Differential Revision: https://phabricator.haskell.org/D202 GHC Trac Issues: #6018
* Fix some tests that were broken by D861Eric Seidel2015-09-021-0/+0
| | | | | | | | | | I didn't realize that `./validate` does not run every test :( Test Plan: ./validate --slow Update submodule hpc. Differential Revision: https://phabricator.haskell.org/D1204
* Testsuite: mark 4 tests expect_broken_for(#10712, opt_ways)Thomas Miedema2015-09-021-1/+1
| | | | Please revert when #10712 is fixed.
* stm: Fix test caseBen Gamari2015-09-021-0/+0
| | | | Updates stm submodule.
* Use IP based CallStack in error and undefinedEric Seidel2015-09-0213-120/+126
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch modifies `error`, `undefined`, and `assertError` to use implicit call-stacks to provide better error messages to users. There are a few knock-on effects: - `GHC.Classes.IP` is now wired-in so it can be used in the wired-in types for `error` and `undefined`. - `TysPrim.tyVarList` has been replaced with a new function `TysPrim.mkTemplateTyVars`. `tyVarList` made it easy to introduce subtle bugs when you need tyvars of different kinds. The naive ``` tv1 = head $ tyVarList kind1 tv2 = head $ tyVarList kind2 ``` would result in `tv1` and `tv2` sharing a `Unique`, thus substitutions would be applied incorrectly, treating `tv1` and `tv2` as the same tyvar. `mkTemplateTyVars` avoids this pitfall by taking a list of kinds and producing a single tyvar of each kind. - The types `GHC.SrcLoc.SrcLoc` and `GHC.Stack.CallStack` now live in ghc-prim. - The type `GHC.Exception.ErrorCall` has a new constructor `ErrorCallWithLocation` that takes two `String`s instead of one, the 2nd one being arbitrary metadata about the error (but usually the call-stack). A bi-directional pattern synonym `ErrorCall` continues to provide the old API. Updates Cabal, array, and haddock submodules. Reviewers: nh2, goldfire, simonpj, hvr, rwbarton, austin, bgamari Reviewed By: simonpj Subscribers: rwbarton, rodlogic, goldfire, maoe, simonmar, carter, liyang, bgamari, thomie Differential Revision: https://phabricator.haskell.org/D861 GHC Trac Issues: #5273
* integer-gmp: optimise bitBigNatHerbert Valerio Riedel2015-08-291-1/+18
| | | | | | | | | | | | | This is a somewhat minor optimisation exploiting the static knowledge of the operands involved allowing to save a few allocations. Reviewers: austin, rwbarton, goldfire, bgamari Reviewed By: bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1179
* Make Generic (Proxy t) instance poly-kinded (fixes #10775)RyanGlScott2015-08-292-19/+22
| | | | | | | | | | | | | | | | | | | | | | | This amounts to enabling PolyKinds in GHC.Generics. However, explicit kind signatures must be applied to the datatypes and typeclasses in GHC.Generics to ensure that the Core which TcGenGenerics generates is properly kinded. Several of the typeclasses in GHC.Generics could be poly-kinded, but this differential does not attempt to address this, since D493 already addresses this. Test Plan: ./validate Reviewers: hvr, austin, dreixel, bgamari Reviewed By: austin, dreixel, bgamari Subscribers: goldfire, thomie Differential Revision: https://phabricator.haskell.org/D1166 GHC Trac Issues: #10775
* base: Remove a redundant 'return'Simon Peyton Jones2015-08-271-2/+1
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* Implement getSizeofMutableByteArrayOp primopBen Gamari2015-08-211-28/+35
| | | | | | | | | | | | | | | Now since ByteArrays are mutable we need to be more explicit about when the size is queried. Test Plan: Add testcase and validate Reviewers: goldfire, hvr, austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1139 GHC Trac Issues: #9447
* Build system: delete half-baked Cygwin supportThomas Miedema2015-08-201-5/+0
| | | | | | | | | | | | | | | | | | | We only support building GHC on mys2 nowadays, see https://ghc.haskell.org/trac/ghc/wiki/Building/Preparation/Windows. This (partially) reverts various commits from a few years ago, among which: * 5775d5142da227d65fb86994d363eb16841ee642 "Add OSTYPE build-system variable, and use it" * 3fb8c431824aa2f3bd979e35d1a283546fcfbe74 "Fix building libgmp on cygwin" * cdbb4720c424500adb57cbbef69721d0b039fa46 "Fix cmd invocation by libffi cuild system on Windows 7 cygwin" * e8121501ee3549a35e954726ccfd871ac9d51f83 "Fix dblatex and xml* tool detection on Windows" Reviewed by: austin, Phyx Differential Revision: https://phabricator.haskell.org/D1155
* Testsuite: mark encoding005 expect_broken(#10623) on WindowsThomas Miedema2015-08-151-1/+2
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* Testsuite: mark T8089 expect_broken(#7325) on WindowsThomas Miedema2015-08-151-1/+5
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* template-haskell: Add changelog entry to infix type operatorsBen Gamari2015-08-121-0/+6
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* Bump template-haskell to new major version 2.11Herbert Valerio Riedel2015-08-122-1/+8
| | | | | | | ...since we already have introduced backward compat breakage that breaks packages such as QuickCheck-2.8.1 Differential Revision: https://phabricator.haskell.org/D1144
* Update transformers submodule to 0.4.3.0 releaseHerbert Valerio Riedel2015-08-091-0/+0
| | | | Differential Revision: https://phabricator.haskell.org/D1140
* Make oneShot open-kindedJoachim Breitner2015-08-081-0/+7
| | | | | | | | | akio wants to use oneShot with unlifted types as well, and there is no good reason not to let him. This changes the type of the built-in oneShot definition to open kinds, and also expand the documentation a little bit. Differential Revision: https://phabricator.haskell.org/D1136
* Sync base/changelog.md with GHC 7.10.2 releaseHerbert Valerio Riedel2015-08-071-3/+4
| | | | [skip ci]
* base: Add missing Traversable instance for ZipListBen Gamari2015-08-072-3/+9
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* base: Add instancesfumieval2015-08-065-5/+32
| | | | | | | | | | | | | | | | | | | | | | | | | This patch adds following instances: * Foldable ZipList * Traversable ZipList * Functor Complex * Applicative Complex * Monad Complex * Foldable Complex * Traversable Complex * Generic1 Complex * Monoid a => Monoid (Identity a) * Storable () Reviewers: ekmett, fumieval, hvr, austin Subscribers: thomie, #core_libraries_committee Projects: #core_libraries_committee Differential Revision: https://phabricator.haskell.org/D1049 GHC Trac Issues: #10609
* Add Fixity info for infix typesRyanGlScott2015-08-053-11/+17
| | | | | | | | | | | | | | | | | | | | | | Template Haskell allows reification of fixity for infix functions and data constructors, and not for infix types. This adds a `Fixity` field to the relevant `Info` constructors that can have infix types (`ClassI`, `TyConI`, and `FamilyI`). I don't think that `VarI` or `PrimTyConI` can be infix, but I could be wrong. Test Plan: ./validate Reviewers: austin, goldfire, bgamari Reviewed By: goldfire, bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1109 GHC Trac Issues: #10704
* Make sure that `all`, `any`, `and`, and `or` fuse (#9848)Takano Akio2015-08-054-0/+25
| | | | | | | | | | | | | | Test Plan: validate Reviewers: hvr, austin, bgamari, simonpj Reviewed By: simonpj Subscribers: simonpj, thomie Differential Revision: https://phabricator.haskell.org/D1126 GHC Trac Issues: #9848
* Make Exception datatypes into newtypesRyanGlScott2015-08-053-6/+9
| | | | | | | | | | | | | | | Certain instances of `Exception` are simply datatypes with only one argument, which should be `newtype`s. Reviewers: ekmett, hvr, austin, bgamari Reviewed By: bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1131 GHC Trac Issues: #10738
* Drop custom mapM impl for []Ben Gamari2015-08-051-3/+0
| | | | | | | | | | | | | | | | | See https://mail.haskell.org/pipermail/libraries/2015-May/025708.html for motivation. This fixes #10457 Test Plan: Validate Reviewers: hvr, austin Subscribers: simonmar, thomie, dolio Differential Revision: https://phabricator.haskell.org/D1124 GHC Trac Issues: #10457
* Typos in comments [skip ci]Gabor Greif2015-08-033-3/+3
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* Update parallel submodule, and re-enable warningsSimon Marlow2015-08-031-0/+0
| | | | | | | | | | | | Test Plan: using remote validate Reviewers: austin, hvr, simonpj, bgamari Reviewed By: bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1117
* Testsuite: mark tests recently fixed as passing + accept new stderrThomas Miedema2015-07-301-0/+0
| | | | Update submodule array.
* Don't allowInterrupt inside uninterruptibleMaskBen Gamari2015-07-303-4/+24
| | | | | | | | This fixes #9516. Differential Revision: https://phabricator.haskell.org/D181 Authored-by: Edsko de Vries <edsko@well-typed.com>
* Comments onlySimon Peyton Jones2015-07-301-1/+1
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* Fallout from more assiduous RULE warningsSimon Peyton Jones2015-07-284-15/+58
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | GHC now warns if rules compete, so that it's not predicatable which will work and which will not. E.g. {-# RULES f (g x) = ... g True = ... #-} If we had (f (g True)) it's not clear which rule would fire. This showed up fraility in the libraries. * Suppress warnigns in Control.Arrow, Control.Category for class methods. At the moment we simply don't have a good way to write a RULE with a class method in the LHS. See Trac #1595. Arrow and Category attempt to do so; I have silenced the complaints with -fno-warn-inline-rule-shadowing, but it's not a great solution. * Adjust the NOINLINE pragma on 'GHC.Base.map' to account for the map/coerce rule * Adjust the rewrite rules in Enum, especially for the "literal 1" case. See Note [Enum Integer rules for literal 1]. * Suppress warnings for 'bytestring' e.g. libraries/bytestring/Data/ByteString.hs:895:1: warning: Rule "ByteString specialise break (x==)" may never fire because rule "Class op ==" for ‘==’ might fire first Probable fix: add phase [n] or [~n] to the competing rule
* Add UInfixT to TH types (fixes #10522)Michael Smith2015-07-274-10/+37
| | | | | | | | | | | | | | | | | | | | | | | | | | UInfixT is like UInfixE or UInfixP but for types. Template Haskell splices can use it to punt fixity handling to GHC when constructing types. UInfixT is converted in compiler/hsSyn/Convert to a right-biased tree of HsOpTy, which is already rearranged in compiler/rename/RnTypes to match operator fixities. This patch consists of (1) adding UInfixT to the AST, (2) implementing the conversion and updating relevant comments, (3) updating pretty-printing and library support, and (4) adding tests. Test Plan: validate Reviewers: austin, goldfire, bgamari Reviewed By: bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1088 GHC Trac Issues: #10522
* Add missing parentheses in eqBigNatWord#Reid Barton2015-07-251-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Summary: I'm pretty sure that parentheses were intended here. But oddly, they make very little difference. The presumably intended expression (sizeofBigNat# bn ==# 1#) `andI#` (bigNatToWord bn `eqWord#` w#) is 1# exactly when bn consists of a single limb equal to w#, clearly. In the original expression sizeofBigNat# bn ==# 1# `andI#` (bigNatToWord bn `eqWord#` w#) the right-hand side of ==# is always 0# or 1#. So it is 1# when bn consists of a single limb equal to w#. It is also 1# when bn has zero limbs and the word past the end of bn does not happen to be equal to w#. So in practice the difference is that nullBigNat was eqBigNatWord# to almost everything, but eqBigNatWord# is never supposed to be called on nullBigNat anyways. Note that even the corrected version might perform an out-of-bounds memory access if passed nullBigNat, because `andI#` is not guaranteed to short-circuit, though in fact GHC does convert isZeroBigNat to a series of branches in my local build. Test Plan: validate Reviewers: hvr, bgamari, goldfire, austin Reviewed By: hvr, bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1095
* Use isTrue# around primitive comparisons in integer-gmpReid Barton2015-07-251-30/+30
| | | | | | | | | | | | | | | | | | | | | | | | | Summary: The form case na# ==# nb# of 0# -> ... _ -> ... sometimes generates convoluted assembly, see #10676. timesInt2Integer was the most spectacular offender, especially as it is a rather cheap function overall (no calls to gmp). I checked a few instances and some of the old generated assembly was fine already, but I changed them all for consistency. The new form is also more consistent with use of these primops in general. Test Plan: validate Reviewers: hvr, bgamari, goldfire, austin Reviewed By: hvr Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1094
* Library names, with Cabal submodule updateEdward Z. Yang2015-07-231-0/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | A library name is a package name, package version, and hash of the version names of all textual dependencies (i.e. packages which were included.) A library name is a coarse approximation of installed package IDs, which are suitable for inclusion in package keys (you don't want to put an IPID in a package key, since it means the key will change any time the source changes.) - We define ShPackageKey, which is the semantic object which is hashed into a PackageKey. You can use 'newPackageKey' to hash a ShPackageKey to a PackageKey - Given a PackageKey, we can lookup its ShPackageKey with 'lookupPackageKey'. The way we can do this is by consulting the 'pkgKeyCache', which records a reverse mapping from every hash to the ShPackageKey. This means that if you load in PackageKeys from external sources (e.g. interface files), you also need to load in a mapping of PackageKeys to their ShPackageKeys so we can populate the cache. - We define a 'LibraryName' which encapsulates the full depenency resolution that Cabal may have selected; this is opaque to GHC but can be used to distinguish different versions of a package. - Definite packages don't have an interesting PackageKey, so we rely on Cabal to pass them to us. - We can pretty-print package keys while displaying the instantiation, but it's not wired up to anything (e.g. the Outputable instance of PackageKey). Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu> Test Plan: validate Reviewers: austin, bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1056 GHC Trac Issues: #10566
* Update encoding001 to test the full range of non-surrogate code pointsReid Barton2015-07-232-12/+6
| | | | | | | | | | | | | | | | | GHC has used surrogate code points for roundtripping since 7.4. See Note [Roundtripping]. Also, improve the wording of that Note slightly. Test Plan: validate still passes Reviewers: austin, hvr, bgamari Reviewed By: bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1087
* When iconv is unavailable, use an ASCII encoding to encode ASCIIReid Barton2015-07-216-6/+203
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | D898 and D1059 implemented a fallback behavior to handle the case that the end user's iconv installation is broken (typically due to running inside a chroot in which the necessary locale files and/or gconv modules have not been installed). In this case, if the program requests an ASCII locale, GHC's char8 encoding is used rather than the program failing. However, silently mangling data like char8 does when the programmer did not ask for it is poor behavior, for reasons described in D1059. This commit implements an ASCII encoding and uses it in the fallback case when iconv is unavailable and the user has requested ASCII. Test Plan: Added tests for the encodings defined in Latin1. Also, manually ran a statically-linked executable of that test in a chroot and the tests passed (up to the ones that call mkTextEncoding "LATIN1", since there is no fallback from iconv for that case yet). Reviewers: austin, hvr, hsyl20, bgamari Reviewed By: hsyl20, bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1085 GHC Trac Issues: #7695, #10623
* Comments and layout onlySimon Peyton Jones2015-07-211-62/+125
| | | | This patch adds a lot of visual structure to this key module
* Delete __GLASGOW_HASKELL__ ifdefs for stage0 < 7.8Thomas Miedema2015-07-211-6/+0
| | | | | | | | | | Reviewers: austin, goldfire, bgamari Reviewed By: bgamari Subscribers: bgamari, thomie Differential Revision: https://phabricator.haskell.org/D904
* Update submodule hpc with fix for #10529Thomas Miedema2015-07-201-0/+0
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* Testsuite: simplify T8089 (#8089)Thomas Miedema2015-07-202-30/+13
| | | | | | | The previous implementation wasn't working for the `ghci` test way, causing a fulltest failure. Differential Revision: https://phabricator.haskell.org/D1075
* Support wild cards in TH splicesThomas Winant2015-07-203-0/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Declaration splices: partial type signatures are fully supported in TH declaration splices. For example, the wild cards in the example below will unify with `Eq a` and `a -> a -> Bool`, as expected: ``` [d| foo :: _ => _ foo x y = x == y |] ``` - Expression splices: anonymous and named wild cards are supported in expression signatures, but extra-constraints wild cards aren't. Just as is the case for regular expression signatures. ``` [e | Just True :: _a _ |] ``` - Typed expression splices: the same wildcards as in (untyped) expression splices are supported. - Pattern splices: TH doesn't support type signatures in pattern splices, consequently, partial type signatures aren't supported either. - Type splices: partial type signatures are only partially supported in type splices, specifically: only anonymous wild cards are allowed. So `[t| _ |]`, `[t| _ -> Maybe _ |]` will work, but `[t| _ => _ |]` or `[| _a |]` won't (without `-XNamedWildCards`, the latter will work as the named wild card is treated as a type variable). Normally, named wild cards are collected before renaming a (partial) type signature. However, TH type splices are run during renaming, i.e. after the initial traversal, leading to out of scope errors for named wild cards. We can't just extend the initial traversal to collect the named wild cards in TH type splices, as we'd need to expand them, which is supposed to happen only once, during renaming. Similarly, the extra-constraints wild card is handled right before renaming too, and is therefore also not supported in a TH type splice. Another reason not to support extra-constraints wild cards in TH type splices is that a single signature can contain many TH type splices, whereas it mustn't contain more than one extra-constraints wild card. Enforcing would this be hard the way things are currently organised. Anonymous wild cards pose no problem, because they start without names and are given names during renaming. These names are collected right after renaming. The names generated for anonymous wild cards in TH type splices will thus be collected as well. With a more invasive refactoring of the renaming, partial type signatures could be fully supported in TH type splices. As only anonymous wild cards have been requested so far, these small changes satisfying this request will do for now. Also don't forget that a TH declaration splices support all kinds of wild cards. - Extra-constraints wild cards were silently ignored in expression and pattern signatures, appropriate error messages are now generated. Test Plan: run new tests Reviewers: austin, goldfire, adamgundry, bgamari Reviewed By: goldfire, adamgundry, bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1048 GHC Trac Issues: #10094, #10548
* Testsuite: mark array001 and conc034 expect_broken_for(#10659, ['optasm',...])Thomas Miedema2015-07-181-0/+0
| | | | Update submodule array.
* Handle Char#, Addr# in TH quasiquoter (fixes #10620)RyanGlScott2015-07-174-1/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | DsMeta does not attempt to handle quasiquoted Char# or Addr# values, which causes expressions like `$([| 'a'# |])` or `$([| "abc"# |])` to fail with an `Exotic literal not (yet) handled by Template Haskell` error. To fix this, the API of `template-haskell` had to be changed so that `Lit` now has an extra constructor `CharPrimL` (a `StringPrimL` constructor already existed, but it wasn't used). In addition, `DsMeta` has to manipulate `CoreExpr`s directly that involve `Word8`s. In order to do this, `Word8` had to be added as a wired-in type to `TysWiredIn`. Actually converting from `HsCharPrim` and `HsStringPrim` to `CharPrimL` and `StringPrimL`, respectively, is pretty straightforward after that, since both `HsCharPrim` and `CharPrimL` use `Char` internally, and `HsStringPrim` uses a `ByteString` internally, which can easily be converted to `[Word8]`, which is what `StringPrimL` uses. Reviewers: goldfire, austin, simonpj, bgamari Reviewed By: simonpj, bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1054 GHC Trac Issues: #10620
* Docs: `sortOn = sortBy (comparing f)` [skip ci]Thomas Miedema2015-07-161-1/+1
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* Testsuite: rename *.stderr-ghc to *.stderrThomas Miedema2015-07-143-59/+4
| | | | And *.stdout-ghc to *.stdout. We only have output files for ghc now.
* Testsuite: delete remaining only_compiler_types(['ghc']) setupsThomas Miedema2015-07-142-3/+1
| | | | | No point in pretending other compilers can use the GHC testsuite. This makes the *.T files a bit shorter.
* Fix self-contained handling of ASCII encodingBen Gamari2015-07-103-18/+49
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | D898 was primarily intended to fix hangs in the event that iconv was unavailable (namely #10298 and #7695). In addition to this fix, it also introduced self-contained handling of ANSI terminals to allow compiled executables to run in minimal environments lacking iconv. However, the behavior that the patch introduced is highly suspicious. Specifically, it gives the user a UTF-8 encoding even if they requested ASCII. This has the potential to break quite a lot of code. At very least it breaks GHC's Unicode terminal detection logic, which attempts to catch an invalid character when encoding a pair of smart-quotes. Of course, this exception will never be thrown if a UTF-8 encoder is used. Here we use the `char8` encoding to handle requests for ASCII encodings in the event that we find iconv to be non-functional. Fixes #10623. Test Plan: Validate with T8959a Reviewers: rwbarton, hvr, austin, hsyl20 Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1059 GHC Trac Issues: #10623
* Delete the WayPar wayThomas Miedema2015-07-104-38/+1
| | | | | | Also remove 't' and 's' from ALL_WAYS; they don't exist. Differential Revision: https://phabricator.haskell.org/D1055
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