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Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d3d055b8d10a549e42d18ae4859bc902f939f534">d3d055b8</a></strong>
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<span>by Galen Huntington</span>
<i>at 2020-05-21T12:20:18-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clarify pitfalls of NegativeLiterals; see #18022.</pre>
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<h4>1 changed file:</h4>
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<a href="#afc5c9567f619749d27f89c5904b2eb41814069c">
docs/users_guide/exts/negative_literals.rst
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<h4>Changes:</h4>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d3d055b8d10a549e42d18ae4859bc902f939f534#afc5c9567f619749d27f89c5904b2eb41814069c"><strong>docs/users_guide/exts/negative_literals.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">@@ -8,16 +8,24 @@ Negative literals</td>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"> :since: 7.8.1</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="plaintext"> Enable <span class="idiff left right">the use of un-parenthesized </span>negative numeric literals.</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> Enable negative numeric literals.</span>
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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">The literal ``-123`` is, according to Haskell98 and Haskell 2010,</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext">two tokens, a unary minus (``-``) and the number 123, and is</span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext">desugared as ``negate (fromInteger 123)``. The language extension</span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="plaintext">:extension:`NegativeLiterals` <span class="idiff left right">means that it is instead desugared as</span></span>
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<pre style="margin: 0;">-<span id="LC16" class="line" lang="plaintext">``fromInteger (-123)``.</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext">:extension:`NegativeLiterals` <span class="idiff left right">causes it to be treated as a single</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"><span class="idiff left right">token and desugared as </span>``fromInteger (-123)``.</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="LC18" class="line" lang="plaintext">This can <span class="idiff left right">make a difference when the positive and negative range of a</span></span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="plaintext"><span class="idiff left right">numeric </span>data type don't match up. For example, in 8-bit arithmetic -128</span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="plaintext">is representable, but +128 is not. So ``negate (fromInteger 128)``<span class="idiff left right"> will</span></span>
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<pre style="margin: 0;">-<span id="LC21" class="line" lang="plaintext">elicit an unexpected integer-literal-overflow message.</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext">This can <span class="idiff left right">be useful when the positive and negative range of a numeric</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext">data type don't match up. For example, in 8-bit arithmetic -128</span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext">is representable, but +128 is not. So ``negate (fromInteger 128)``</span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext"><span class="idiff left right">will </span>elicit an unexpected integer-literal-overflow message.</span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext">Whitespace can be inserted, as in ``- 123``, to force interpretation</span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="plaintext">as two tokens.</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">One pitfall is that with :extension:`NegativeLiterals`, ``x-1`` will</span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext">be parsed as ``x`` applied to the argument ``-1``, which is usually</span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="plaintext">not what you want. ``x - 1`` or even ``x- 1`` can be used instead</span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="plaintext">for subtraction.</span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="plaintext"></span></pre>
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