diff options
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/users_guide/flags.xml | 194 | ||||
| -rw-r--r-- | docs/users_guide/glasgow_exts.xml | 141 |
2 files changed, 164 insertions, 171 deletions
diff --git a/docs/users_guide/flags.xml b/docs/users_guide/flags.xml index 4ebcc965a3..eaa622596f 100644 --- a/docs/users_guide/flags.xml +++ b/docs/users_guide/flags.xml @@ -593,23 +593,23 @@ <entry><option>-fno-glasgow-exts</option></entry> </row> <row> - <entry><option>-X=AllowOverlappingInstances</option></entry> + <entry><option>-XOverlappingInstances</option></entry> <entry>Enable <link linkend="instance-overlap">overlapping instances</link></entry> <entry>dynamic</entry> - <entry><option>-X=NoAllowOverlappingInstances</option></entry> + <entry><option>-XNoOverlappingInstances</option></entry> </row> <row> - <entry><option>-X=AllowIncoherentInstances</option></entry> + <entry><option>-XIncoherentInstances</option></entry> <entry>Enable <link linkend="instance-overlap">incoherent instances</link>. - Implies <option>-X=AllowOverlappingInstances</option> </entry> + Implies <option>-XOverlappingInstances</option> </entry> <entry>dynamic</entry> - <entry><option>-X=NoAllowIncoherentInstances</option></entry> + <entry><option>-XNoIncoherentInstances</option></entry> </row> <row> - <entry><option>-X=AllowUndecidableInstances</option></entry> + <entry><option>-XUndecidableInstances</option></entry> <entry>Enable <link linkend="undecidable-instances">undecidable instances</link></entry> <entry>dynamic</entry> - <entry><option>-X=NoAllowUndecidableInstances</option></entry> + <entry><option>-XNoUndecidableInstances</option></entry> </row> <row> <entry><option>-fcontext-stack=N</option><replaceable>n</replaceable></entry> @@ -618,11 +618,11 @@ <entry></entry> </row> <row> - <entry><option>-X=Arrows</option></entry> + <entry><option>-XArrows</option></entry> <entry>Enable <link linkend="arrow-notation">arrow notation</link> extension</entry> <entry>dynamic</entry> - <entry><option>-X=NoArrows</option></entry> + <entry><option>-XNoArrows</option></entry> </row> <row> <entry><option>-fdisambiguate-record-fields</option></entry> @@ -632,24 +632,24 @@ <entry><option>-fno-disambiguate-record-fields</option></entry> </row> <row> - <entry><option>-X=FFI</option> or <option>-X=ForeignFunctionInterface</option></entry> + <entry><option>-XForeignFunctionInterface</option></entry> <entry>Enable <link linkend="ffi">foreign function interface</link> (implied by <option>-fglasgow-exts</option>)</entry> <entry>dynamic</entry> - <entry><option>-X=NoFFI</option></entry> + <entry><option>-XNoForeignFunctionInterface</option></entry> </row> <row> - <entry><option>-X=Generics</option></entry> + <entry><option>-XGenerics</option></entry> <entry>Enable <link linkend="generic-classes">generic classes</link></entry> <entry>dynamic</entry> - <entry><option>-X=NoGenerics</option></entry> + <entry><option>-XNoGenerics</option></entry> </row> <row> - <entry><option>-X=ImplicitParams</option></entry> + <entry><option>-XImplicitParams</option></entry> <entry>Enable <link linkend="implicit-parameters">Implicit Parameters</link>. Implied by <option>-fglasgow-exts</option>.</entry> <entry>dynamic</entry> - <entry><option>-X=NoImplicitParams</option></entry> + <entry><option>-XNoImplicitParams</option></entry> </row> <row> <entry><option>-firrefutable-tuples</option></entry> @@ -658,254 +658,254 @@ <entry><option>-fno-irrefutable-tuples</option></entry> </row> <row> - <entry><option>-X=NoImplicitPrelude</option></entry> + <entry><option>-XNoImplicitPrelude</option></entry> <entry>Don't implicitly <literal>import Prelude</literal></entry> <entry>dynamic</entry> - <entry><option>-X=ImplicitPrelude</option></entry> + <entry><option>-XImplicitPrelude</option></entry> </row> <row> - <entry><option>-X=NoMonomorphismRestriction</option></entry> + <entry><option>-XNoMonomorphismRestriction</option></entry> <entry>Disable the <link linkend="monomorphism">monomorphism restriction</link></entry> <entry>dynamic</entry> - <entry><option>-X=MonomorphismRrestriction</option></entry> + <entry><option>-XMonomorphismRrestriction</option></entry> </row> <row> - <entry><option>-X=NoMonoPatBinds</option></entry> + <entry><option>-XNoMonoPatBinds</option></entry> <entry>Make <link linkend="monomorphism">pattern bindings polymorphic</link></entry> <entry>dynamic</entry> - <entry><option>-X=MonoPatBinds</option></entry> + <entry><option>-XMonoPatBinds</option></entry> </row> <row> - <entry><option>-X=RelaxedPolyRed</option></entry> + <entry><option>-XRelaxedPolyRed</option></entry> <entry>Relaxed checking for <link linkend="typing-binds">mutually-recursive polymorphic functions</link></entry> <entry>dynamic</entry> - <entry><option>-X=NoRelaxedPolyRec</option></entry> + <entry><option>-XNoRelaxedPolyRec</option></entry> </row> <row> - <entry><option>-X=ExtendedDefaultRules</option></entry> + <entry><option>-XExtendedDefaultRules</option></entry> <entry>Use GHCi's <link linkend="extended-default-rules">extended default rules</link> in a normal module</entry> <entry>dynamic</entry> - <entry><option>-X=NoExtendedDefaultRules</option></entry> + <entry><option>-XNoExtendedDefaultRules</option></entry> </row> <row> - <entry><option>-X=OverloadedStrings</option></entry> + <entry><option>-XOverloadedStrings</option></entry> <entry>Enable <link linkend="overloaded-strings">overloaded string literals</link>. </entry> <entry>dynamic</entry> - <entry><option>-X=NoOverloadedStrings</option></entry> + <entry><option>-XNoOverloadedStrings</option></entry> </row> <row> - <entry><option>-X=GADTs</option></entry> + <entry><option>-XGADTs</option></entry> <entry>Enable <link linkend="gadts">generalised algebraic data types</link>. </entry> <entry>dynamic</entry> - <entry><option>-X=NoGADTs</option></entry> + <entry><option>-XNoGADTs</option></entry> </row> <row> - <entry><option>-X=TypeFamilies</option></entry> + <entry><option>-XTypeFamilies</option></entry> <entry>Enable <link linkend="type-families">type families</link>.</entry> <entry>dynamic</entry> - <entry><option>-X=NoTypeFamilies</option></entry> + <entry><option>-XNoTypeFamilies</option></entry> </row> <row> - <entry><option>-X=ScopedTypeVariables</option></entry> + <entry><option>-XScopedTypeVariables</option></entry> <entry>Enable <link linkend="scoped-type-variables">lexically-scoped type variables</link>. Implied by <option>-fglasgow-exts</option>.</entry> <entry>dynamic</entry> - <entry><option>-X=NoScopedTypeVariables</option></entry> + <entry><option>-XNoScopedTypeVariables</option></entry> </row> <row> - <entry><option>-X=TH</option> or <option>-X=TemplateHaskell</option></entry> + <entry><option>-XTemplateHaskell</option></entry> <entry>Enable <link linkend="template-haskell">Template Haskell</link>. No longer implied by <option>-fglasgow-exts</option>.</entry> <entry>dynamic</entry> - <entry><option>-X=NoTH</option></entry> + <entry><option>-XNoTemplateHaskell</option></entry> </row> <row> - <entry><option>-X=BangPtterns</option></entry> + <entry><option>-XBangPtterns</option></entry> <entry>Enable <link linkend="bang-patterns">bang patterns</link>.</entry> <entry>dynamic</entry> - <entry><option>-X=NoBangPatterns</option></entry> + <entry><option>-XNoBangPatterns</option></entry> </row> <row> - <entry><option>-X=CPP</option></entry> + <entry><option>-XCPP</option></entry> <entry>Enable the <link linkend="c-pre-processor">C preprocessor</link>.</entry> <entry>dynamic</entry> - <entry><option>-X=CPP</option></entry> + <entry><option>-XNoCPP</option></entry> </row> <row> - <entry><option>-X=PatternGuards</option></entry> + <entry><option>-XPatternGuards</option></entry> <entry>Enable <link linkend="pattern-guards">pattern guards</link>.</entry> <entry>dynamic</entry> - <entry><option>-X=PatternGuards</option></entry> + <entry><option>-XNoPatternGuards</option></entry> </row> <row> - <entry><option>-X=UnicodeSyntax</option></entry> + <entry><option>-XUnicodeSyntax</option></entry> <entry>Enable unicode syntax.</entry> <entry>dynamic</entry> - <entry><option>-X=UnicodeSyntax</option></entry> + <entry><option>-XNoUnicodeSyntax</option></entry> </row> <row> - <entry><option>-X=MagicHash</option></entry> + <entry><option>-XMagicHash</option></entry> <entry>Enable the “magic hash”.</entry> <entry>dynamic</entry> - <entry><option>-X=MagicHash</option></entry> + <entry><option>-XNoMagicHash</option></entry> </row> <row> - <entry><option>-X=PolymorphicComponents</option></entry> + <entry><option>-XPolymorphicComponents</option></entry> <entry>Enable polymorphic components.</entry> <entry>dynamic</entry> - <entry><option>-X=PolymorphicComponents</option></entry> + <entry><option>-XNoPolymorphicComponents</option></entry> </row> <row> - <entry><option>-X=ExistentialQuantification</option></entry> + <entry><option>-XExistentialQuantification</option></entry> <entry>Enable <link linkend="existential-quantification">existential quantification</link>.</entry> <entry>dynamic</entry> - <entry><option>-X=ExistentialQuantification</option></entry> + <entry><option>-XNoExistentialQuantification</option></entry> </row> <row> - <entry><option>-X=KindSignatures</option></entry> + <entry><option>-XKindSignatures</option></entry> <entry>Enable kind signatures.</entry> <entry>dynamic</entry> - <entry><option>-X=KindSignatures</option></entry> + <entry><option>-XNoKindSignatures</option></entry> </row> <row> - <entry><option>-X=PatternSignatures</option></entry> + <entry><option>-XPatternSignatures</option></entry> <entry>Enable <link linkend="pattern-type-sigs">pattern type signatures</link>.</entry> <entry>dynamic</entry> - <entry><option>-X=PatternSignatures</option></entry> + <entry><option>-XNoPatternSignatures</option></entry> </row> <row> - <entry><option>-X=EmptyDataDecls</option></entry> + <entry><option>-XEmptyDataDecls</option></entry> <entry>Enable empty data declarations.</entry> <entry>dynamic</entry> - <entry><option>-X=EmptyDataDecls</option></entry> + <entry><option>-XNoEmptyDataDecls</option></entry> </row> <row> - <entry><option>-X=ParallelListComp</option></entry> + <entry><option>-XParallelListComp</option></entry> <entry>Enable <link linkend="parallel-list-comprehensions">parallel list comprehensions</link>.</entry> <entry>dynamic</entry> - <entry><option>-X=ParallelListComp</option></entry> + <entry><option>-XNoParallelListComp</option></entry> </row> <row> - <entry><option>-X=UnliftedFFITypes</option></entry> + <entry><option>-XUnliftedFFITypes</option></entry> <entry>Enable unlifted FFI types.</entry> <entry>dynamic</entry> - <entry><option>-X=UnliftedFFITypes</option></entry> + <entry><option>-XNoUnliftedFFITypes</option></entry> </row> <row> - <entry><option>-X=PartiallyAppliedClosedTypeSynonyms</option></entry> + <entry><option>-XPartiallyAppliedClosedTypeSynonyms</option></entry> <entry>Enable partially applied type synonyms.</entry> <entry>dynamic</entry> - <entry><option>-X=PartiallyAppliedClosedTypeSynonyms</option></entry> + <entry><option>-XNoPartiallyAppliedClosedTypeSynonyms</option></entry> </row> <row> - <entry><option>-X=Rank2Types</option></entry> + <entry><option>-XNoRank2Types</option></entry> <entry>Enable rank-2 types.</entry> <entry>dynamic</entry> - <entry><option>-X=Rank2Types</option></entry> + <entry><option>-XNoRank2Types</option></entry> </row> <row> - <entry><option>-X=RankNTypes</option></entry> + <entry><option>-XRankNTypes</option></entry> <entry>Enable rank-N types.</entry> <entry>dynamic</entry> - <entry><option>-X=RankNTypes</option></entry> + <entry><option>-XNoRankNTypes</option></entry> </row> <row> - <entry><option>-X=TypeOperators</option></entry> + <entry><option>-XTypeOperators</option></entry> <entry>Enable type operators.</entry> <entry>dynamic</entry> - <entry><option>-X=TypeOperators</option></entry> + <entry><option>-XNoTypeOperators</option></entry> </row> <row> - <entry><option>-X=RecursiveDo</option></entry> + <entry><option>-XRecursiveDo</option></entry> <entry>Enable <link linkend="mdo-notation">recursive do (mdo) notation</link>.</entry> <entry>dynamic</entry> - <entry><option>-X=RecursiveDo</option></entry> + <entry><option>-XNoRecursiveDo</option></entry> </row> <row> - <entry><option>-X=Parr</option></entry> + <entry><option>-XPArr</option></entry> <entry>Enable parallel arrays.</entry> <entry>dynamic</entry> - <entry><option>-X=Parr</option></entry> + <entry><option>-XNoPArr</option></entry> </row> <row> - <entry><option>-X=RecordWildCards</option></entry> + <entry><option>-XRecordWildCards</option></entry> <entry>Enable record wildcards.</entry> <entry>dynamic</entry> - <entry><option>-X=RecordWildCards</option></entry> + <entry><option>-XNoRecordWildCards</option></entry> </row> <row> - <entry><option>-X=RecordPuns</option></entry> + <entry><option>-XRecordPuns</option></entry> <entry>Enable record puns.</entry> <entry>dynamic</entry> - <entry><option>-X=RecordPuns</option></entry> + <entry><option>-XNoRecordPuns</option></entry> </row> <row> - <entry><option>-X=DisambiguateRecordFields</option></entry> + <entry><option>-XDisambiguateRecordFields</option></entry> <entry>Enable the <link linkend="disambiguate-fields">disambiguate fields.</link> exception</entry> <entry>dynamic</entry> - <entry><option>-X=DisambiguateRecordFields</option></entry> + <entry><option>-XNoDisambiguateRecordFields</option></entry> </row> <row> - <entry><option>-X=UnboxedTuples</option></entry> + <entry><option>-XUnboxedTuples</option></entry> <entry>Enable <link linkend="unboxed-tuples">unboxed tuples</link>.</entry> <entry>dynamic</entry> - <entry><option>-X=UnboxedTuples</option></entry> + <entry><option>-XNoUnboxedTuples</option></entry> </row> <row> - <entry><option>-X=StandaloneDeriving</option></entry> + <entry><option>-XStandaloneDeriving</option></entry> <entry>Enable standalone deriving.</entry> <entry>dynamic</entry> - <entry><option>-X=StandaloneDeriving</option></entry> + <entry><option>-XNoStandaloneDeriving</option></entry> </row> <row> - <entry><option>-X=DeriveDataTypeable</option></entry> + <entry><option>-XDeriveDataTypeable</option></entry> <entry>Enable deriving for the Data and Typeable classes.</entry> <entry>dynamic</entry> - <entry><option>-X=DeriveDataTypeable</option></entry> + <entry><option>-XNoDeriveDataTypeable</option></entry> </row> <row> - <entry><option>-X=TypeSynonymInstances</option></entry> + <entry><option>-XTypeSynonymInstances</option></entry> <entry>Enable <link linkend="type-synonyms">type synonyms</link>.</entry> <entry>dynamic</entry> - <entry><option>-X=TypeSynonymInstances</option></entry> + <entry><option>-XNoTypeSynonymInstances</option></entry> </row> <row> - <entry><option>-X=FlexibleContexts</option></entry> + <entry><option>-XFlexibleContexts</option></entry> <entry>Enable flexible contexts.</entry> <entry>dynamic</entry> - <entry><option>-X=FlexibleContexts</option></entry> + <entry><option>-XNoFlexibleContexts</option></entry> </row> <row> - <entry><option>-X=FlexibleInstances</option></entry> + <entry><option>-XFlexibleInstances</option></entry> <entry>Enable flexible instances.</entry> <entry>dynamic</entry> - <entry><option>-X=FlexibleInstances</option></entry> + <entry><option>-XNoFlexibleInstances</option></entry> </row> <row> - <entry><option>-X=ConstrainedClassMethods</option></entry> + <entry><option>-XConstrainedClassMethods</option></entry> <entry>Enable constrained class methods.</entry> <entry>dynamic</entry> - <entry><option>-X=ConstrainedClassMethods</option></entry> + <entry><option>-XNoConstrainedClassMethods</option></entry> </row> <row> - <entry><option>-X=MultiParamTypeClasses</option></entry> + <entry><option>-XMultiParamTypeClasses</option></entry> <entry>Enable <link linkend="multi-param-type-classes">multi parameter type classes</link>.</entry> <entry>dynamic</entry> - <entry><option>-X=MultiParamTypeClasses</option></entry> + <entry><option>-XNoMultiParamTypeClasses</option></entry> </row> <row> - <entry><option>-X=FunctionalDependencies</option></entry> + <entry><option>-XFunctionalDependencies</option></entry> <entry>Enable <link linkend="functional-dependencies">functional dependencies</link>.</entry> <entry>dynamic</entry> - <entry><option>-X=FunctionalDependencies</option></entry> + <entry><option>-XNoFunctionalDependencies</option></entry> </row> <row> - <entry><option>-X=GeneralizedNewtypeDeriving</option></entry> + <entry><option>-XGeneralizedNewtypeDeriving</option></entry> <entry>Enable <link linkend="newtype-deriving">newtype deriving</link>.</entry> <entry>dynamic</entry> - <entry><option>-X=GeneralizedNewtypeDeriving</option></entry> + <entry><option>-XNoGeneralizedNewtypeDeriving</option></entry> </row> </tbody> </tgroup> diff --git a/docs/users_guide/glasgow_exts.xml b/docs/users_guide/glasgow_exts.xml index 27d38eeca0..053c4a93e1 100644 --- a/docs/users_guide/glasgow_exts.xml +++ b/docs/users_guide/glasgow_exts.xml @@ -42,23 +42,16 @@ documentation</ulink> describes all the libraries that come with GHC. permitted. Leaving out all of them gives you standard Haskell 98.</para> - <para>Generally speaking, all the language options are introduced by "<option>-X</option>" or "<option>-X=</option>"; - e.g. <option>-X=TemplateHaskell</option>. Before anything else is done, the string following - "<option>-X</option>" is normalised by removing hyphens and converting - to lower case. So <option>-X=TemplateHaskell</option>, <option>-XTemplateHaskell</option>, and - <option>-Xtemplate-haskell</option> are all equivalent. + <para>Generally speaking, all the language options are introduced by "<option>-X</option>", + e.g. <option>-XTemplateHaskell</option>. </para> <para> All the language options can be turned off by using the prefix "<option>No</option>"; - e.g. "<option>-X=NoTemplateHaskell</option>".</para> + e.g. "<option>-XNoTemplateHaskell</option>".</para> <para> Language options recognised by Cabal can also be enabled using the <literal>LANGUAGE</literal> pragma, thus <literal>{-# LANGUAGE TemplateHaskell #-}</literal> (see <xref linkend="language-pragma"/>>). </para> - <para> All the language options can be introduced with "<option>-f</option>" as well as "<option>-X</option>", - but this is a deprecated feature for backward compatibility. Use the "<option>-X</option>" - or LANGUAGE-pragma form.</para> - <para>Turning on an option that enables special syntax <emphasis>might</emphasis> cause working Haskell 98 code to fail to compile, perhaps because it uses a variable name which has @@ -115,18 +108,18 @@ documentation</ulink> describes all the libraries that come with GHC. <literal>|)</literal>, <literal>{|</literal>.</para> <para>Implies these specific language options: - <option>-X=ForeignFunctionInterface</option>, - <option>-X=ImplicitParams</option>, - <option>-X=ScopedTypeVariables</option>, - <option>-X=GADTs</option>, - <option>-X=TypeFamilies</option>. </para> + <option>-XForeignFunctionInterface</option>, + <option>-XImplicitParams</option>, + <option>-XScopedTypeVariables</option>, + <option>-XGADTs</option>, + <option>-XTypeFamilies</option>. </para> </listitem> </varlistentry> <varlistentry> <term> - <option>-X=ffi</option> and <option>-X=ForeignFunctionInterface</option>: - <indexterm><primary><option>-X=FFI</option></primary></indexterm> + <option>-XForeignFunctionInterface</option>: + <indexterm><primary><option>-XForeignFunctionInterface</option></primary></indexterm> </term> <listitem> <para>This option enables the language extension defined in the @@ -138,7 +131,7 @@ documentation</ulink> describes all the libraries that come with GHC. <varlistentry> <term> - <option>-X=MonomorphismRestriction</option>,<option>-X=MonoPatBinds</option>: + <option>-XMonomorphismRestriction</option>,<option>-XMonoPatBinds</option>: </term> <listitem> <para> These two flags control how generalisation is done. @@ -149,8 +142,8 @@ documentation</ulink> describes all the libraries that come with GHC. <varlistentry> <term> - <option>-X=ExtendedDefaultRules</option>: - <indexterm><primary><option>-X=ExtendedDefaultRules</option></primary></indexterm> + <option>-XExtendedDefaultRules</option>: + <indexterm><primary><option>-XExtendedDefaultRules</option></primary></indexterm> </term> <listitem> <para> Use GHCi's extended default rules in a regular module (<xref linkend="extended-default-rules"/>). @@ -161,16 +154,16 @@ documentation</ulink> describes all the libraries that come with GHC. <varlistentry> <term> - <option>-X=AllowOverlappingInstances</option> - <indexterm><primary><option>-X=AllowOverlappingInstances</option></primary></indexterm> + <option>-XOverlappingInstances</option> + <indexterm><primary><option>-XOverlappingInstances</option></primary></indexterm> </term> <term> - <option>-X=AllowUndecidableInstances</option> - <indexterm><primary><option>-X=AllowUndecidableInstances</option></primary></indexterm> + <option>-XUndecidableInstances</option> + <indexterm><primary><option>-XUndecidableInstances</option></primary></indexterm> </term> <term> - <option>-X=AllowIncoherentInstances</option> - <indexterm><primary><option>-X=AllowIncoherentInstances</option></primary></indexterm> + <option>-XIncoherentInstances</option> + <indexterm><primary><option>-XIncoherentInstances</option></primary></indexterm> </term> <term> <option>-fcontext-stack=N</option> @@ -195,8 +188,8 @@ documentation</ulink> describes all the libraries that come with GHC. <varlistentry> <term> - <option>-X=Arrows</option> - <indexterm><primary><option>-X=Arrows</option></primary></indexterm> + <option>-XArrows</option> + <indexterm><primary><option>-XArrows</option></primary></indexterm> </term> <listitem> <para>See <xref linkend="arrow-notation"/>. Independent of @@ -214,8 +207,8 @@ documentation</ulink> describes all the libraries that come with GHC. <varlistentry> <term> - <option>-X=Generics</option> - <indexterm><primary><option>-X=Generics</option></primary></indexterm> + <option>-XGenerics</option> + <indexterm><primary><option>-XGenerics</option></primary></indexterm> </term> <listitem> <para>See <xref linkend="generic-classes"/>. Independent of @@ -224,13 +217,13 @@ documentation</ulink> describes all the libraries that come with GHC. </varlistentry> <varlistentry> - <term><option>-X=NoImplicitIrelude</option></term> + <term><option>-XNoImplicitPrelude</option></term> <listitem> - <para><indexterm><primary>-XnoImplicitPrelude + <para><indexterm><primary>-XNoImplicitPrelude option</primary></indexterm> GHC normally imports <filename>Prelude.hi</filename> files for you. If you'd rather it didn't, then give it a - <option>-XnoImplicitPrelude</option> option. The idea is + <option>-XNoImplicitPrelude</option> option. The idea is that you can then import a Prelude of your own. (But don't call it <literal>Prelude</literal>; the Haskell module namespace is flat, and you must not conflict with any @@ -245,14 +238,14 @@ documentation</ulink> describes all the libraries that come with GHC. translation for list comprehensions continues to use <literal>Prelude.map</literal> etc.</para> - <para>However, <option>-X=NoImplicitPrelude</option> does + <para>However, <option>-XNoImplicitPrelude</option> does change the handling of certain built-in syntax: see <xref linkend="rebindable-syntax"/>.</para> </listitem> </varlistentry> <varlistentry> - <term><option>-X=ImplicitParams</option></term> + <term><option>-XImplicitParams</option></term> <listitem> <para>Enables implicit parameters (see <xref linkend="implicit-parameters"/>). Currently also implied by @@ -265,7 +258,7 @@ documentation</ulink> describes all the libraries that come with GHC. </varlistentry> <varlistentry> - <term><option>-X=OverloadedStrings</option></term> + <term><option>-XOverloadedStrings</option></term> <listitem> <para>Enables overloaded string literals (see <xref linkend="overloaded-strings"/>).</para> @@ -273,7 +266,7 @@ documentation</ulink> describes all the libraries that come with GHC. </varlistentry> <varlistentry> - <term><option>-X=ScopedTypeVariables</option></term> + <term><option>-XScopedTypeVariables</option></term> <listitem> <para>Enables lexically-scoped type variables (see <xref linkend="scoped-type-variables"/>). Implied by @@ -282,7 +275,7 @@ documentation</ulink> describes all the libraries that come with GHC. </varlistentry> <varlistentry> - <term><option>-X=TH</option>, <option>-X=TemplateHaskell</option></term> + <term><option>-XTemplateHaskell</option></term> <listitem> <para>Enables Template Haskell (see <xref linkend="template-haskell"/>). This flag must @@ -859,7 +852,7 @@ This name is not supported by GHC. hierarchy. It completely defeats that purpose if the literal "1" means "<literal>Prelude.fromInteger 1</literal>", which is what the Haskell Report specifies. - So the <option>-X=NoImplicitPrelude</option> flag causes + So the <option>-XNoImplicitPrelude</option> flag causes the following pieces of built-in syntax to refer to <emphasis>whatever is in scope</emphasis>, not the Prelude versions: @@ -1847,7 +1840,7 @@ may use different notation to that implemented in GHC. </para> <para> The rest of this section outlines the extensions to GHC that support GADTs. The extension is enabled with -<option>-X=GADTs</option>. +<option>-XGADTs</option>. <itemizedlist> <listitem><para> A GADT can only be declared using GADT-style syntax (<xref linkend="gadt-style"/>); @@ -2750,8 +2743,8 @@ makes instance inference go into a loop, because it requires the constraint </para> <para> Nevertheless, GHC allows you to experiment with more liberal rules. If you use -the experimental flag <option>-X=AllowUndecidableInstances</option> -<indexterm><primary>-X=AllowUndecidableInstances</primary></indexterm>, +the experimental flag <option>-XUndecidableInstances</option> +<indexterm><primary>-XUndecidableInstances</primary></indexterm>, both the Paterson Conditions and the Coverage Condition (described in <xref linkend="instance-rules"/>) are lifted. Termination is ensured by having a fixed-depth recursion stack. If you exceed the stack depth you get a @@ -2768,11 +2761,11 @@ with <option>-fcontext-stack=</option><emphasis>N</emphasis>. In general, <emphasis>GHC requires that that it be unambiguous which instance declaration should be used to resolve a type-class constraint</emphasis>. This behaviour -can be modified by two flags: <option>-X=AllowOverlappingInstances</option> -<indexterm><primary>-X=AllowOverlappingInstances +can be modified by two flags: <option>-XOverlappingInstances</option> +<indexterm><primary>-XOverlappingInstances </primary></indexterm> -and <option>-X=AllowIncoherentInstances</option> -<indexterm><primary>-X=AllowIncoherentInstances +and <option>-XIncoherentInstances</option> +<indexterm><primary>-XIncoherentInstances </primary></indexterm>, as this section discusses. Both these flags are dynamic flags, and can be set on a per-module basis, using an <literal>OPTIONS_GHC</literal> pragma if desired (<xref linkend="source-file-options"/>).</para> @@ -2800,7 +2793,7 @@ particular constraint matches more than one. </para> <para> -The <option>-X=AllowOverlappingInstances</option> flag instructs GHC to allow +The <option>-XOverlappingInstances</option> flag instructs GHC to allow more than one instance to match, provided there is a most specific one. For example, the constraint <literal>C Int [Int]</literal> matches instances (A), (C) and (D), but the last is more specific, and hence is chosen. If there is no @@ -2817,22 +2810,22 @@ Suppose that from the RHS of <literal>f</literal> we get the constraint GHC does not commit to instance (C), because in a particular call of <literal>f</literal>, <literal>b</literal> might be instantiate to <literal>Int</literal>, in which case instance (D) would be more specific still. -So GHC rejects the program. If you add the flag <option>-X=AllowIncoherentInstances</option>, +So GHC rejects the program. If you add the flag <option>-XIncoherentInstances</option>, GHC will instead pick (C), without complaining about the problem of subsequent instantiations. </para> <para> The willingness to be overlapped or incoherent is a property of the <emphasis>instance declaration</emphasis> itself, controlled by the -presence or otherwise of the <option>-X=AllowOverlappingInstances</option> -and <option>-X=AllowIncoherentInstances</option> flags when that mdodule is +presence or otherwise of the <option>-XOverlappingInstances</option> +and <option>-XIncoherentInstances</option> flags when that mdodule is being defined. Neither flag is required in a module that imports and uses the instance declaration. Specifically, during the lookup process: <itemizedlist> <listitem><para> An instance declaration is ignored during the lookup process if (a) a more specific match is found, and (b) the instance declaration was compiled with -<option>-X=AllowOverlappingInstances</option>. The flag setting for the +<option>-XOverlappingInstances</option>. The flag setting for the more-specific instance does not matter. </para></listitem> <listitem><para> @@ -2840,7 +2833,7 @@ Suppose an instance declaration does not match the constraint being looked up, b does unify with it, so that it might match when the constraint is further instantiated. Usually GHC will regard this as a reason for not committing to some other constraint. But if the instance declaration was compiled with -<option>-X=AllowIncoherentInstances</option>, GHC will skip the "does-it-unify?" +<option>-XIncoherentInstances</option>, GHC will skip the "does-it-unify?" check for that declaration. </para></listitem> </itemizedlist> @@ -2849,18 +2842,18 @@ overlapping instances without the library client having to know. </para> <para> If an instance declaration is compiled without -<option>-X=AllowOverlappingInstances</option>, +<option>-XOverlappingInstances</option>, then that instance can never be overlapped. This could perhaps be inconvenient. Perhaps the rule should instead say that the <emphasis>overlapping</emphasis> instance declaration should be compiled in this way, rather than the <emphasis>overlapped</emphasis> one. Perhaps overlap at a usage site should be permitted regardless of how the instance declarations -are compiled, if the <option>-X=AllowOverlappingInstances</option> flag is +are compiled, if the <option>-XOverlappingInstances</option> flag is used at the usage site. (Mind you, the exact usage site can occasionally be hard to pin down.) We are interested to receive feedback on these points. </para> -<para>The <option>-X=AllowIncoherentInstances</option> flag implies the -<option>-X=AllowOverlappingInstances</option> flag, but not vice versa. +<para>The <option>-XIncoherentInstances</option> flag implies the +<option>-XOverlappingInstances</option> flag, but not vice versa. </para> </sect3> @@ -3043,7 +3036,7 @@ Boston, Jan 2000. due to Jeff Lewis.)</para> <para>Implicit parameter support is enabled with the option -<option>-X=ImplicitParams</option>.</para> +<option>-XImplicitParams</option>.</para> <para> A variable is called <emphasis>dynamically bound</emphasis> when it is bound by the calling @@ -4081,7 +4074,7 @@ and all others are monomorphic until the group is generalised <para>Following a suggestion of Mark Jones, in his paper <ulink url="http://www.cse.ogi.edu/~mpj/thih/">Typing Haskell in Haskell</ulink>, -GHC implements a more general scheme. If <option>-X=RelaxedPolyRec</option> is +GHC implements a more general scheme. If <option>-XRelaxedPolyRec</option> is specified: <emphasis>the dependency analysis ignores references to variables that have an explicit type signature</emphasis>. @@ -4110,7 +4103,7 @@ Now, the defintion for <literal>f</literal> is typechecked, with this type for The same refined dependency analysis also allows the type signatures of mutually-recursive functions to have different contexts, something that is illegal in Haskell 98 (Section 4.5.2, last sentence). With -<option>-X=RelaxedPolyRec</option> +<option>-XRelaxedPolyRec</option> GHC only insists that the type signatures of a <emphasis>refined</emphasis> group have identical type signatures; in practice this means that only variables bound by the same pattern binding must have the same context. For example, this is fine: @@ -4131,7 +4124,7 @@ pattern binding must have the same context. For example, this is fine: <para> GHC supports <emphasis>overloaded string literals</emphasis>. Normally a string literal has type <literal>String</literal>, but with overloaded string -literals enabled (with <literal>-X=OverloadedStrings</literal>) +literals enabled (with <literal>-XOverloadedStrings</literal>) a string literal has type <literal>(IsString a) => a</literal>. </para> <para> @@ -4157,7 +4150,7 @@ it explicitly (for exmaple, to give an instance declaration for it), you can imp from module <literal>GHC.Exts</literal>. </para> <para> -Haskell's defaulting mechanism is extended to cover string literals, when <option>-X-OverloadedStrings</option> is specified. +Haskell's defaulting mechanism is extended to cover string literals, when <option>-XOverloadedStrings</option> is specified. Specifically: <itemizedlist> <listitem><para> @@ -4220,7 +4213,7 @@ wiki page on type families</ulink>. The material will be moved to this user's guide when it has stabilised. </para> <para> -Type families are enabled by the flag <option>-X=TypeFamilies</option>. +Type families are enabled by the flag <option>-XTypeFamilies</option>. </para> @@ -4269,10 +4262,10 @@ Tim Sheard is going to expand it.) <para> Template Haskell has the following new syntactic constructions. You need to use the flag - <option>-X=TemplateHaskell</option> or <option>-X=TH</option> - <indexterm><primary><option>-X=TemplateHaskell</option></primary> + <option>-XTemplateHaskell</option> + <indexterm><primary><option>-XTemplateHaskell</option></primary> </indexterm>to switch these syntactic extensions on - (<option>-X=TemplateHaskell</option> is no longer implied by + (<option>-XTemplateHaskell</option> is no longer implied by <option>-fglasgow-exts</option>).</para> <itemizedlist> @@ -4418,7 +4411,7 @@ pr s = gen (parse s) <para>Now run the compiler (here we are a Cygwin prompt on Windows): </para> <programlisting> -$ ghc --make -X=TemplateHaskell main.hs -o main.exe +$ ghc --make -XTemplateHaskell main.hs -o main.exe </programlisting> <para>Run "main.exe" and here is your output:</para> @@ -4507,7 +4500,7 @@ Palgrave, 2003. </itemizedlist> and the arrows web page at <ulink url="http://www.haskell.org/arrows/"><literal>http://www.haskell.org/arrows/</literal></ulink>. -With the <option>-X=Arrows</option> flag, GHC supports the arrow +With the <option>-XArrows</option> flag, GHC supports the arrow notation described in the second of these papers. What follows is a brief introduction to the notation; it won't make much sense unless you've read Hughes's paper. @@ -4977,7 +4970,7 @@ prime feature description</ulink> contains more discussion and examples than the material below. </para> <para> -Bang patterns are enabled by the flag <option>-X=BangPatterns</option>. +Bang patterns are enabled by the flag <option>-XBangPatterns</option>. </para> <sect2 id="bang-patterns-informal"> @@ -6525,7 +6518,7 @@ where clause and over-ride whichever methods you please. <itemizedlist> <listitem> <para>Use the flags <option>-fglasgow-exts</option> (to enable the extra syntax), - <option>-X=Generics</option> (to generate extra per-data-type code), + <option>-XGenerics</option> (to generate extra per-data-type code), and <option>-package lang</option> (to make the <literal>Generics</literal> library available. </para> </listitem> @@ -6734,21 +6727,21 @@ carried out at let and where bindings. <sect2> <title>Switching off the dreaded Monomorphism Restriction</title> - <indexterm><primary><option>-X=NoMonomorphismRestriction</option></primary></indexterm> + <indexterm><primary><option>-XNoMonomorphismRestriction</option></primary></indexterm> <para>Haskell's monomorphism restriction (see <ulink url="http://haskell.org/onlinereport/decls.html#sect4.5.5">Section 4.5.5</ulink> of the Haskell Report) can be completely switched off by -<option>-X=NoMonomorphismRestriction</option>. +<option>-XNoMonomorphismRestriction</option>. </para> </sect2> <sect2> <title>Monomorphic pattern bindings</title> - <indexterm><primary><option>-X=NoMonoPatBinds</option></primary></indexterm> - <indexterm><primary><option>-X=MonoPatBinds</option></primary></indexterm> + <indexterm><primary><option>-XNoMonoPatBinds</option></primary></indexterm> + <indexterm><primary><option>-XMonoPatBinds</option></primary></indexterm> <para> As an experimental change, we are exploring the possibility of making pattern bindings monomorphic; that is, not generalised at all. @@ -6764,7 +6757,7 @@ can be completely switched off by [x] = e -- A pattern binding </programlisting> Experimentally, GHC now makes pattern bindings monomorphic <emphasis>by -default</emphasis>. Use <option>-X=MonoPatBinds</option> to recover the +default</emphasis>. Use <option>-XMonoPatBinds</option> to recover the standard behaviour. </para> </sect2> |