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<h3>
Ben Gamari pushed to branch wip/fix-users-guide
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/785ce6263367184ea5251cd9f5784e23d9b349d3">785ce626</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-11T04:32:22Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Fix a few markup issues
Strangely these were only causing the build to fail in the aarch64-linux
job, despite Sphinx throwing errors in all jobs I checked.
Also changes some `#ifdef`s to `#if defined` to satisfy the linter.
</pre>
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<h4>2 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#2b8f04584fafff0b8f78c8867b06665527f31762">
docs/users_guide/ffi-chap.rst
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<li class="file-stats">
<a href="#b02c1c6109c60b8f685234b0dbaabf6c79fed2a2">
docs/users_guide/ghci.rst
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<h4>Changes:</h4>
<li id="2b8f04584fafff0b8f78c8867b06665527f31762">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/785ce6263367184ea5251cd9f5784e23d9b349d3#2b8f04584fafff0b8f78c8867b06665527f31762"><strong>docs/users_guide/ffi-chap.rst</strong></a>
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<table class="code white" style="font-family: monospace; font-size: 90%;" bgcolor="#fff" width="100%" cellpadding="0" cellspacing="0">
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="87" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="87" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -87,7 +87,7 @@ Newtype wrapping of the IO monad</td>
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<td class="diff-line-num new_line" data-linenumber="87" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC87" class="line" lang="plaintext">The FFI spec requires the IO monad to appear in various places, but it</span>
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<td class="diff-line-num old_line" data-linenumber="88" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="88" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC88" class="line" lang="plaintext">can sometimes be convenient to wrap the IO monad in a ``newtype``, thus: ::</span>
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<td class="diff-line-num old_line" data-linenumber="89" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC89" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC90" class="line" lang="plaintext"> newtype MyIO a = MIO (IO a)</span>
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<pre style="margin: 0;">+<span id="LC90" class="line" lang="plaintext"> <span class="idiff left right"> </span>newtype MyIO a = MIO (IO a)</span>
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<td class="diff-line-num old_line" data-linenumber="91" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC91" class="line" lang="plaintext"></span>
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<td class="diff-line-num old_line" data-linenumber="92" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="92" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC92" class="line" lang="plaintext">(A reason for doing so might be to prevent the programmer from calling</span>
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<td class="diff-line-num old_line" data-linenumber="93" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="93" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="plaintext">arbitrary IO procedures in some part of the program.)</span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="112" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="112" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -112,15 +112,15 @@ The type variables in the type of a foreign declaration may be quantified with</td>
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<td class="diff-line-num old_line" data-linenumber="112" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="112" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC112" class="line" lang="plaintext">an explicit ``forall`` by using the :extension:`ExplicitForAll` language</span>
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<td class="diff-line-num old_line" data-linenumber="113" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="plaintext">extension, as in the following example: ::</span>
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<pre style="margin: 0;"> <span id="LC114" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC115" class="line" lang="plaintext"> {-# LANGUAGE ExplicitForAll #-}</span>
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<pre style="margin: 0;">-<span id="LC116" class="line" lang="plaintext"> foreign import ccall "mmap" c_mmap :: forall a. CSize -> IO (Ptr a)</span>
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<td class="diff-line-num new old_line" data-linenumber="117" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="plaintext"> <span class="idiff left right"> </span>{-# LANGUAGE ExplicitForAll #-}</span>
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="plaintext"> <span class="idiff left right"> </span>foreign import ccall "mmap" c_mmap :: forall a. CSize -> IO (Ptr a)</span>
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<pre style="margin: 0;"> <span id="LC117" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC118" class="line" lang="plaintext">Note that an explicit ``forall`` must appear at the front of the type signature</span>
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="plaintext">and is not permitted to appear nested within the type, as in the following</span>
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="plaintext">(erroneous) examples: ::</span>
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<pre style="margin: 0;"> <span id="LC121" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC122" class="line" lang="plaintext"> foreign import ccall "mmap" c_mmap' :: CSize -> forall a. IO (Ptr a)</span>
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<pre style="margin: 0;">-<span id="LC123" class="line" lang="plaintext"> foreign import ccall quux :: (forall a. Ptr a) -> IO ()</span>
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="plaintext"> <span class="idiff left right"> </span>foreign import ccall "mmap" c_mmap' :: CSize -> forall a. IO (Ptr a)</span>
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="plaintext"> <span class="idiff left right"> </span>foreign import ccall quux :: (forall a. Ptr a) -> IO ()</span>
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<pre style="margin: 0;"> <span id="LC124" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC125" class="line" lang="plaintext">.. _ffi-prim:</span>
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="plaintext"></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">@@ -372,7 +372,7 @@ program. Here's the C code:</td>
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372
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372
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<pre style="margin: 0;"> <span id="LC372" class="line" lang="plaintext"> #include <stdio.h></span>
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<pre style="margin: 0;"> <span id="LC373" class="line" lang="plaintext"> #include "HsFFI.h"</span>
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<pre style="margin: 0;"> <span id="LC374" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC375" class="line" lang="plaintext"> #if<span class="idiff left right">def __GLASGOW_HASKELL__</span></span>
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<pre style="margin: 0;">+<span id="LC375" class="line" lang="plaintext"> #if<span class="idiff left right"> defined(__GLASGOW_HASKELL__)</span></span>
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<pre style="margin: 0;"> <span id="LC376" class="line" lang="plaintext"> #include "Foo_stub.h"</span>
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<pre style="margin: 0;"> <span id="LC377" class="line" lang="plaintext"> #endif</span>
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<pre style="margin: 0;"> <span id="LC378" class="line" lang="plaintext"></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">@@ -391,7 +391,7 @@ program. Here's the C code:</td>
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<pre style="margin: 0;"> <span id="LC391" class="line" lang="plaintext"> }</span>
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392
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<pre style="margin: 0;"> <span id="LC392" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC393" class="line" lang="plaintext">We've surrounded the GHC-specific bits with</span>
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<pre style="margin: 0;">-<span id="LC394" class="line" lang="plaintext">``#if<span class="idiff left right">def __GLASGOW_HASKELL__</span>``; the rest of the code should be portable</span>
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<pre style="margin: 0;">+<span id="LC394" class="line" lang="plaintext">``#if<span class="idiff left right"> defined(__GLASGOW_HASKELL__)</span>``; the rest of the code should be portable</span>
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<pre style="margin: 0;"> <span id="LC395" class="line" lang="plaintext">across Haskell implementations that support the FFI standard.</span>
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396
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<pre style="margin: 0;"> <span id="LC396" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC397" class="line" lang="plaintext">The call to ``hs_init()`` initializes GHC's runtime system. Do NOT try</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">@@ -435,7 +435,7 @@ GHC-specific API instead of ``hs_init()``:</td>
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<pre style="margin: 0;"> <span id="LC435" class="line" lang="plaintext"> #include <stdio.h></span>
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<pre style="margin: 0;"> <span id="LC436" class="line" lang="plaintext"> #include "HsFFI.h"</span>
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<pre style="margin: 0;"> <span id="LC437" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC438" class="line" lang="plaintext"> #if<span class="idiff left right">def __GLASGOW_HASKELL__</span></span>
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<pre style="margin: 0;">+<span id="LC438" class="line" lang="plaintext"> #if<span class="idiff left right"> defined(__GLASGOW_HASKELL__)</span></span>
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<pre style="margin: 0;"> <span id="LC439" class="line" lang="plaintext"> #include "Foo_stub.h"</span>
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<pre style="margin: 0;"> <span id="LC440" class="line" lang="plaintext"> #include "Rts.h"</span>
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<pre style="margin: 0;"> <span id="LC441" class="line" lang="plaintext"> #endif</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">@@ -2582,21 +2582,22 @@ commonly used commands.</td>
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<pre style="margin: 0;"> <span id="LC2582" class="line" lang="plaintext"> For example:</span>
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<pre style="margin: 0;"> <span id="LC2583" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2584" class="line" lang="plaintext"> .. code-block:: none</span>
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<pre style="margin: 0;">-<span id="LC2585" class="line" lang="plaintext"> >:instances Maybe (Maybe Int)</span>
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<pre style="margin: 0;">-<span id="LC2586" class="line" lang="plaintext"> instance Eq (Maybe (Maybe Int)) -- Defined in ‘GHC.Maybe’</span>
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<pre style="margin: 0;">-<span id="LC2587" class="line" lang="plaintext"> instance Ord (Maybe (Maybe Int)) -- Defined in ‘GHC.Maybe’</span>
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<pre style="margin: 0;">-<span id="LC2588" class="line" lang="plaintext"> instance Show (Maybe (Maybe Int)) -- Defined in ‘GHC.Show’</span>
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<pre style="margin: 0;">-<span id="LC2589" class="line" lang="plaintext"> instance Read (Maybe (Maybe Int)) -- Defined in ‘GHC.Read’</span>
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<pre style="margin: 0;">-<span id="LC2590" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2591" class="line" lang="plaintext"> >:set -XPartialTypeSignatures -fno-warn-partial-type-signatures</span>
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<pre style="margin: 0;">-<span id="LC2592" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2593" class="line" lang="plaintext"> >:instances Maybe _</span>
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<pre style="margin: 0;">-<span id="LC2594" class="line" lang="plaintext"> instance Eq _ => Eq (Maybe _) -- Defined in ‘GHC.Maybe’</span>
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<pre style="margin: 0;">-<span id="LC2595" class="line" lang="plaintext"> instance Semigroup _ => Monoid (Maybe _) -- Defined in ‘GHC.Base’</span>
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<pre style="margin: 0;">-<span id="LC2596" class="line" lang="plaintext"> instance Ord _ => Ord (Maybe _) -- Defined in ‘GHC.Maybe’</span>
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<pre style="margin: 0;">-<span id="LC2597" class="line" lang="plaintext"> instance Semigroup _ => Semigroup (Maybe _) -- Defined in ‘GHC.Base’</span>
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<pre style="margin: 0;">-<span id="LC2598" class="line" lang="plaintext"> instance Show _ => Show (Maybe _) -- Defined in ‘GHC.Show’</span>
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<pre style="margin: 0;">-<span id="LC2599" class="line" lang="plaintext"> instance Read _ => Read (Maybe _) -- Defined in ‘GHC.Read’</span>
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<pre style="margin: 0;">+<span id="LC2585" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC2586" class="line" lang="plaintext"> > :instances Maybe (Maybe Int)</span>
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<pre style="margin: 0;">+<span id="LC2587" class="line" lang="plaintext"> instance Eq (Maybe (Maybe Int)) -- Defined in ‘GHC.Maybe’</span>
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2588
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<pre style="margin: 0;">+<span id="LC2588" class="line" lang="plaintext"> instance Ord (Maybe (Maybe Int)) -- Defined in ‘GHC.Maybe’</span>
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2589
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<pre style="margin: 0;">+<span id="LC2589" class="line" lang="plaintext"> instance Show (Maybe (Maybe Int)) -- Defined in ‘GHC.Show’</span>
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2590
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<pre style="margin: 0;">+<span id="LC2590" class="line" lang="plaintext"> instance Read (Maybe (Maybe Int)) -- Defined in ‘GHC.Read’</span>
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2591
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<pre style="margin: 0;">+<span id="LC2591" class="line" lang="plaintext"></span>
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2592
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<pre style="margin: 0;">+<span id="LC2592" class="line" lang="plaintext"> > :set -XPartialTypeSignatures -fno-warn-partial-type-signatures</span>
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2593
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<pre style="margin: 0;">+<span id="LC2593" class="line" lang="plaintext"></span>
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2594
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<pre style="margin: 0;">+<span id="LC2594" class="line" lang="plaintext"> > :instances Maybe _</span>
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2595
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<pre style="margin: 0;">+<span id="LC2595" class="line" lang="plaintext"> instance Eq _ => Eq (Maybe _) -- Defined in ‘GHC.Maybe’</span>
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2596
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<pre style="margin: 0;">+<span id="LC2596" class="line" lang="plaintext"> instance Semigroup _ => Monoid (Maybe _) -- Defined in ‘GHC.Base’</span>
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2597
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<pre style="margin: 0;">+<span id="LC2597" class="line" lang="plaintext"> instance Ord _ => Ord (Maybe _) -- Defined in ‘GHC.Maybe’</span>
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2598
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<pre style="margin: 0;">+<span id="LC2598" class="line" lang="plaintext"> instance Semigroup _ => Semigroup (Maybe _) -- Defined in ‘GHC.Base’</span>
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2599
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<pre style="margin: 0;">+<span id="LC2599" class="line" lang="plaintext"> instance Show _ => Show (Maybe _) -- Defined in ‘GHC.Show’</span>
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2600
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<pre style="margin: 0;">+<span id="LC2600" class="line" lang="plaintext"> instance Read _ => Read (Maybe _) -- Defined in ‘GHC.Read’</span>
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2600
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2601
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<pre style="margin: 0;"> <span id="LC2601" class="line" lang="plaintext"></span>
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2601
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2602
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<pre style="margin: 0;"> <span id="LC2602" class="line" lang="plaintext">.. ghci-cmd:: :main; ⟨arg1⟩ ... ⟨argn⟩</span>
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2602
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2603
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<pre style="margin: 0;"> <span id="LC2603" class="line" lang="plaintext"></span>
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