wasmer/rustdoc/scroll/trait.Pwrite.html

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `Pwrite` trait in crate `scroll`."><meta name="keywords" content="rust, rustlang, rust-lang, Pwrite"><title>scroll::Pwrite - Rust</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../dark.css"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script src="../storage.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="shortcut icon" href="../favicon.ico"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc trait"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">&#9776;</div><a href='../scroll/index.html'><div class='logo-container'><img src='../rust-logo.png' alt='logo'></div></a><p class='location'>Trait Pwrite</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#provided-methods">Provided Methods</a><div class="sidebar-links"><a href="#method.gwrite">gwrite</a><a href="#method.gwrite_with">gwrite_with</a><a href="#method.pwrite">pwrite</a><a href="#method.pwrite_with">pwrite_with</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='index.html'>scroll</a></p><script>window.sidebarCurrent = {name: 'Pwrite', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press S to search, ? for more options…" type="search"></div><a id="settings-menu" href="../settings.html"><img src="../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='out-of-band'><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>&#x2212;</span>]</a></span><a class='srclink' href='../src/scroll/pwrite.rs.html#33-79' title='goto source code'>[src]</a></span><span class='in-band'>Trait <a href='index.html'>scroll</a>::<wbr><a class="trait" href=''>Pwrite</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class='rust trait'>pub trait Pwrite&lt;Ctx, E, I&nbsp;=&nbsp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html" title="trait core::ops::index::Index">Index</a>&lt;I&gt; + <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/index/trait.IndexMut.html" title="trait core::ops::index::IndexMut">IndexMut</a>&lt;<a class="struct" href="https://doc.rust-lang.org/nightly/core/ops/range/struct.RangeFrom.html" title="struct core::ops::range::RangeFrom">RangeFrom</a>&lt;I&gt;&gt; + <a class="trait" href="../scroll/ctx/trait.MeasureWith.html" title="trait scroll::ctx::MeasureWith">MeasureWith</a>&lt;Ctx, Units = I&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;Ctx: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Copy.html" title="trait core::marker::Copy">Copy</a>,<br>&nbsp;&nbsp;&nbsp;&nbsp;I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/op
fn <a href='#method.pwrite' class='fnname'>pwrite</a>&lt;N:&nbsp;<a class="trait" href="../scroll/ctx/trait.TryIntoCtx.html" title="trait scroll::ctx::TryIntoCtx">TryIntoCtx</a>&lt;Ctx, Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html#associatedtype.Output" title="type core::ops::index::Index::Output">Output</a>, Error = E, Size = I&gt;&gt;(<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&amp;mut self, <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;n: N, <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;offset: I<br>&nbsp;&nbsp;&nbsp;&nbsp;) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;I, E&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ctx: <a class="trait" href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html" title="trait core::default::Default">Default</a></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.pwrite_with' class='fnname'>pwrite_with</a>&lt;N:&nbsp;<a class="trait" href="../scroll/ctx/trait.TryIntoCtx.html" title="trait scroll::ctx::TryIntoCtx">TryIntoCtx</a>&lt;Ctx, Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html#associatedtype.Output" title="type core::ops::index::Index::Output">Output</a>, Error = E, Size = I&gt;&gt;(<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&amp;mut self, <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;n: N, <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;offset: I, <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ctx: Ctx<br>&nbsp;&nbsp;&nbsp;&nbsp;) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;I, E&gt; { ... }
<div class='item-spacer'></div> fn <a href='#method.gwrite' class='fnname'>gwrite</a>&lt;N:&nbsp;<a class="trait" href="../scroll/ctx/trait.TryIntoCtx.html" title="trait scroll::ctx::TryIntoCtx">TryIntoCtx</a>&lt;Ctx, Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html#associatedtype.Output" title="type core::ops::index::Index::Output">Output</a>, Error = E, Size = I&gt;&gt;(<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&amp;mut self, <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;n: N, <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;offset: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut </a>I<br>&nbsp;&nbsp;&nbsp;&nbsp;) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;I, E&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/arith/trait.AddAssign.html" title="trait core::ops::arith::AddAssign">AddAssign</a>,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ctx: <a class="trait" href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html" title="trait core::default::Default">Default</a></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.gwrite_with' class='fnname'>gwrite_with</a>&lt;N:&nbsp;<a class="trait" href="../scroll/ctx/trait.TryIntoCtx.html" title="trait scroll::ctx::TryIntoCtx">TryIntoCtx</a>&lt;Ctx, Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html#associatedtype.Output" title="type core::ops::index::Index::Output">Output</a>, Error = E, Size = I&gt;&gt;(<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&amp;mut self, <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;n: N, <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;offset: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut </a>I, <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ctx: Ctx<br>&nbsp;&nbsp;&nbsp;&nbsp;) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;I, E&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/arith/trait.AddAssign.html" title="trait core::ops::arith::AddAssign">AddAssign</a></span>,
{ ... }
}</pre></div><div class='docblock'><p>Writes into <code>Self</code> at an offset of type <code>I</code> using a <code>Ctx</code></p>
<p>To implement writing into an arbitrary byte buffer, implement <code>TryIntoCtx</code></p>
<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">scroll</span>::{<span class="self">self</span>, <span class="ident">ctx</span>, <span class="ident">LE</span>, <span class="ident">Endian</span>, <span class="ident">Pwrite</span>};
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Foo</span>(<span class="ident">u16</span>);
<span class="comment">// this will use the default `DefaultCtx = scroll::Endian` and `I = usize`...</span>
<span class="kw">impl</span> <span class="ident">ctx</span>::<span class="ident">TryIntoCtx</span><span class="op">&lt;</span><span class="ident">Endian</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Foo</span> {
<span class="comment">// you can use your own error here too, but you will then need to specify it in fn generic parameters</span>
<span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> <span class="ident">scroll</span>::<span class="ident">Error</span>;
<span class="kw">type</span> <span class="ident">Size</span> <span class="op">=</span> <span class="ident">usize</span>;
<span class="comment">// you can write using your own context too... see `leb128.rs`</span>
<span class="kw">fn</span> <span class="ident">try_into_ctx</span>(<span class="self">self</span>, <span class="ident">this</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">u8</span>], <span class="ident">le</span>: <span class="ident">Endian</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="self">Self</span>::<span class="ident">Size</span>, <span class="self">Self</span>::<span class="ident">Error</span><span class="op">&gt;</span> {
<span class="kw">if</span> <span class="ident">this</span>.<span class="ident">len</span>() <span class="op">&lt;</span> <span class="number">2</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>((<span class="ident">scroll</span>::<span class="ident">Error</span>::<span class="ident">Custom</span>(<span class="string">&quot;whatever&quot;</span>.<span class="ident">to_string</span>())).<span class="ident">into</span>()) }
<span class="ident">this</span>.<span class="ident">pwrite_with</span>(<span class="self">self</span>.<span class="number">0</span>, <span class="number">0</span>, <span class="ident">le</span>)<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(<span class="number">2</span>)
}
}
<span class="comment">// now we can write a `Foo` into some buffer (in this case, a byte buffer, because that&#39;s what we implemented it for above)</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bytes</span>: [<span class="ident">u8</span>; <span class="number">4</span>] <span class="op">=</span> [<span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>];
<span class="ident">bytes</span>.<span class="ident">pwrite_with</span>(<span class="ident">Foo</span>(<span class="number">0x7f</span>), <span class="number">1</span>, <span class="ident">LE</span>).<span class="ident">unwrap</span>();</pre></div>
</div>
<h2 id='provided-methods' class='small-section-header'>Provided methods<a href='#provided-methods' class='anchor'></a></h2><div class='methods'><h3 id='method.pwrite' class='method'><code id='pwrite.v'>fn <a href='#method.pwrite' class='fnname'>pwrite</a>&lt;N:&nbsp;<a class="trait" href="../scroll/ctx/trait.TryIntoCtx.html" title="trait scroll::ctx::TryIntoCtx">TryIntoCtx</a>&lt;Ctx, Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html#associatedtype.Output" title="type core::ops::index::Index::Output">Output</a>, Error = E, Size = I&gt;&gt;(<br>&nbsp;&nbsp;&nbsp;&nbsp;&amp;mut self, <br>&nbsp;&nbsp;&nbsp;&nbsp;n: N, <br>&nbsp;&nbsp;&nbsp;&nbsp;offset: I<br>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;I, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;Ctx: <a class="trait" href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html" title="trait core::default::Default">Default</a>,&nbsp;</span></code></h3><h3 id='method.pwrite_with' class='method'><code id='pwrite_with.v'>fn <a href='#method.pwrite_with' class='fnname'>pwrite_with</a>&lt;N:&nbsp;<a class="trait" href="../scroll/ctx/trait.TryIntoCtx.html" title="trait scroll::ctx::TryIntoCtx">TryIntoCtx</a>&lt;Ctx, Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html#associatedtype.Output" title="type core::ops::index::Index::Output">Output</a>, Error = E, Size = I&gt;&gt;(<br>&nbsp;&nbsp;&nbsp;&nbsp;&amp;mut self, <br>&nbsp;&nbsp;&nbsp;&nbsp;n: N, <br>&nbsp;&nbsp;&nbsp;&nbsp;offset: I, <br>&nbsp;&nbsp;&nbsp;&nbsp;ctx: Ctx<br>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;I, E&gt;</code></h3><div class='docblock'><p>Write <code>N</code> at offset <code>I</code> with context <code>Ctx</code></p>
<h1 id="example-1" class="section-header"><a href="#example-1">Example</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">scroll</span>::{<span class="ident">Pwrite</span>, <span class="ident">Pread</span>, <span class="ident">LE</span>};
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bytes</span>: [<span class="ident">u8</span>; <span class="number">8</span>] <span class="op">=</span> [<span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>];
<span class="ident">bytes</span>.<span class="ident">pwrite_with</span>::<span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span>(<span class="number">0xbeefbeef</span>, <span class="number">0</span>, <span class="ident">LE</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">bytes</span>.<span class="ident">pread_with</span>::<span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span>(<span class="number">0</span>, <span class="ident">LE</span>).<span class="ident">unwrap</span>(), <span class="number">0xbeefbeef</span>);</pre></div>
</div><h3 id='method.gwrite' class='method'><code id='gwrite.v'>fn <a href='#method.gwrite' class='fnname'>gwrite</a>&lt;N:&nbsp;<a class="trait" href="../scroll/ctx/trait.TryIntoCtx.html" title="trait scroll::ctx::TryIntoCtx">TryIntoCtx</a>&lt;Ctx, Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html#associatedtype.Output" title="type core::ops::index::Index::Output">Output</a>, Error = E, Size = I&gt;&gt;(<br>&nbsp;&nbsp;&nbsp;&nbsp;&amp;mut self, <br>&nbsp;&nbsp;&nbsp;&nbsp;n: N, <br>&nbsp;&nbsp;&nbsp;&nbsp;offset: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut </a>I<br>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;I, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/arith/trait.AddAssign.html" title="trait core::ops::arith::AddAssign">AddAssign</a>,<br>&nbsp;&nbsp;&nbsp;&nbsp;Ctx: <a class="trait" href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html" title="trait core::default::Default">Default</a>,&nbsp;</span></code></h3><div class='docblock'><p>Write <code>n</code> into <code>self</code> at <code>offset</code>, with a default <code>Ctx</code>. Updates the offset.</p>
</div><h3 id='method.gwrite_with' class='method'><code id='gwrite_with.v'>fn <a href='#method.gwrite_with' class='fnname'>gwrite_with</a>&lt;N:&nbsp;<a class="trait" href="../scroll/ctx/trait.TryIntoCtx.html" title="trait scroll::ctx::TryIntoCtx">TryIntoCtx</a>&lt;Ctx, Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html#associatedtype.Output" title="type core::ops::index::Index::Output">Output</a>, Error = E, Size = I&gt;&gt;(<br>&nbsp;&nbsp;&nbsp;&nbsp;&amp;mut self, <br>&nbsp;&nbsp;&nbsp;&nbsp;n: N, <br>&nbsp;&nbsp;&nbsp;&nbsp;offset: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut </a>I, <br>&nbsp;&nbsp;&nbsp;&nbsp;ctx: Ctx<br>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;I, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/arith/trait.AddAssign.html" title="trait core::ops::arith::AddAssign">AddAssign</a>,&nbsp;</span></code></h3><div class='docblock'><p>Write <code>n</code> into <code>self</code> at <code>offset</code>, with the <code>ctx</code>. Updates the offset.</p>
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<h2 id='implementors' class='small-section-header'>Implementors<a href='#implementors' class='anchor'></a></h2><div class='item-list' id='implementors-list'><h3 id='impl-Pwrite%3CCtx%2C%20E%2C%20I%3E' class='impl'><code class='in-band'>impl&lt;Ctx:&nbsp;<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Copy.html" title="trait core::marker::Copy">Copy</a>, I:&nbsp;<a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/arith/trait.Add.html" title="trait core::ops::arith::Add">Add</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Copy.html" title="trait core::marker::Copy">Copy</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialOrd.html" title="trait core::cmp::PartialOrd">PartialOrd</a>, E:&nbsp;<a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;<a class="enum" href="../scroll/enum.Error.html" title="enum scroll::Error">Error</a>&lt;I&gt;&gt;, R:&nbsp;?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html" title="trait core::ops::index::Index">Index</a>&lt;I&gt; + <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/index/trait.IndexMut.html" title="trait core::ops::index::IndexMut">IndexMut</a>&lt;<a class="struct" href="https://doc.rust-lang.org/nightly/core/ops/range/struct.RangeFrom.html" title="struct core::ops::range::RangeFrom">RangeFrom</a>&lt;I&gt;&gt; + <a class="trait" href="../scroll/ctx/trait.MeasureWith.html" title="trait scroll::ctx::MeasureWith">MeasureWith</a>&lt;Ctx, Units = I&gt;&gt; Pwrite&lt;Ctx, E, I&gt; for R</code><a href='#impl-Pwrite%3CCtx%2C%20E%2C%20I%3E' class='anchor'></a><a class='srclink' href='../src/scroll/pwrite.rs.html#81-85' title='goto source code'>[src]</a></h3><div class='impl-items'></div></div><span class='loading-content'>Loading content...</span><script type="text/javascript">window.inlined_types=new Set([]);</script><script type="text/javascript" async
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