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<h3>
Richard Eisenberg pushed to branch wip/T19064
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ae4f003bf1971be216b87dbfebde29ac531217c2">ae4f003b</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-12-16T15:00:20-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Correct documentation around -XTypeOperators
Close #19064
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<h4>1 changed file:</h4>
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<a href="#adc1e431f971fd0417a3116d79ff654e6f669740">
docs/users_guide/exts/type_operators.rst
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<h4>Changes:</h4>
<li id="adc1e431f971fd0417a3116d79ff654e6f669740">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ae4f003bf1971be216b87dbfebde29ac531217c2#adc1e431f971fd0417a3116d79ff654e6f669740"><strong>docs/users_guide/exts/type_operators.rst</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -12,24 +12,11 @@ Type operators</td>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext"> Allow the use and definition of types with operator names.</span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="plaintext"><span class="idiff left right">In types, an operator symbol like ``(+)`` is normally treated as a type</span></span>
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<pre style="margin: 0;">-<span id="LC16" class="line" lang="plaintext"><span class="idiff left right">*variable*, just like ``a``. Thus in Haskell 98 you can say</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"><span class="idiff left right">The language :extension:`TypeOperators` allows you to use infix operators</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"><span class="idiff left right">in types.</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC18" class="line" lang="plaintext">::</span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="plaintext"> type T (+) = ((+), (+))</span>
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<pre style="margin: 0;">-<span id="LC21" class="line" lang="plaintext"> -- Just like: type T a = (a,a)</span>
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<pre style="margin: 0;">-<span id="LC22" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC23" class="line" lang="plaintext"> f :: T Int -> Int</span>
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<pre style="margin: 0;">-<span id="LC24" class="line" lang="plaintext"> f (x,y)= x</span>
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<pre style="margin: 0;">-<span id="LC25" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC26" class="line" lang="plaintext">As you can see, using operators in this way is not very useful, and</span>
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<pre style="margin: 0;">-<span id="LC27" class="line" lang="plaintext">Haskell 98 does not even allow you to write them infix.</span>
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<pre style="margin: 0;">-<span id="LC28" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC29" class="line" lang="plaintext">The language :extension:`TypeOperators` changes this behaviour:</span>
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<pre style="margin: 0;">-<span id="LC30" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC31" class="line" lang="plaintext">- Operator symbols become type *constructors* rather than type</span>
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<pre style="margin: 0;">-<span id="LC32" class="line" lang="plaintext"> *variables*.</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext">- Operator symbols are *constructors* rather than type</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> *variables* (as they are in terms).</span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext">- Operator symbols in types can be written infix, both in definitions</span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="plaintext"> and uses. For example: ::</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -37,6 +24,12 @@ The language :extension:`TypeOperators` changes this behaviour:</td>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="plaintext"> data a + b = Plus a b</span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="plaintext"> type Foo = Int + Bool</span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="plaintext">- Alphanumeric type constructors can now be written infix, using backquote</span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext"> syntax::</span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="plaintext"> x :: Int `Either` Bool</span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="plaintext"> x = Left 5</span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="plaintext"> </span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="plaintext">- There is now some potential ambiguity in import and export lists; for</span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="plaintext"> example if you write ``import M( (+) )`` do you mean the *function*</span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="plaintext"> ``(+)`` or the *type constructor* ``(+)``? The default is the former,</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -52,4 +45,18 @@ The language :extension:`TypeOperators` changes this behaviour:</td>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext"> declarations but, as in :ref:`infix-tycons`, the function and type</span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="plaintext"> constructor share a single fixity.</span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC55" class="line" lang="plaintext"></span></pre>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="plaintext">- There is now potential ambiguity in the traditional syntax for</span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="plaintext"> data constructor declarations. For example::</span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="plaintext"> type a :+: b = Either a b</span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="plaintext"> data X = Int :+: Bool :+: Char</span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="plaintext"> This code wants to declare both a type-level ``:+:`` and a term-level</span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="plaintext"> ``:+:`` (which is, generally, allowed). But we cannot tell how to</span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="plaintext"> parenthesize the data constructor declaration in ``X``: either way</span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="plaintext"> makes sense. We might</span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="plaintext"> imagine that a fixity declaration could help us, but it is awkward</span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="plaintext"> to apply the fixity declaration to the very definition of a new</span>
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<pre style="margin: 0;">+<span id="LC60" class="line" lang="plaintext"> data constructor. Instead of declaring delicate rules around this</span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="plaintext"> issue, GHC simply rejects if the top level of a traditional-syntax</span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="plaintext"> data constructor declaration uses two operators without parenthesizing.</span></pre>
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