<!DOCTYPE html><htmllang="en"><head><metacharset="utf-8"><metaname="viewport"content="width=device-width, initial-scale=1.0"><metaname="generator"content="rustdoc"><metaname="description"content="A chip that implements SHA-256 with a maximum lookup table size of $2^16$."><metaname="keywords"content="rust, rustlang, rust-lang, Table16Chip"><title>Table16Chip in halo2_gadgets::sha256 - Rust</title><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../../static.files/SourceSerif4-Regular-1f7d512b176f0f72.ttf.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../../static.files/SourceSerif4-Bold-124a1ca42af929b6.ttf.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><linkrel="stylesheet"href="../../static.files/normalize-76eba96aa4d2e634.css"><linkrel="stylesheet"href="../../static.files/rustdoc-cd23e1e4557aa9dd.css"id="mainThemeStyle"><linkrel="stylesheet"id="themeStyle"href="../../static.files/light-a21928845c7a186a.css"><linkrel="stylesheet"disabledhref="../../static.files/dark-90fc67ff25a42f29.css"><linkrel="stylesheet"disabledhref="../../static.files/ayu-d75a8bbde915b8ed.css"><scriptid="default-settings"></script><scriptsrc="../../static.files/storage-d43fa987303ecbbb.js"></script><scriptdefersrc="sidebar-items.js"></script><scriptdefersrc="../../static.files/main-458bffc4c06ccf37.js"></script><noscript><linkrel="stylesheet"href="../../static.files/noscript-13285aec31fa243e.css"></noscript><linkrel="alternate icon"type="image/png"href="../../static.files/favicon-16x16-8b506e7a72182f1c.png"><linkrel="alternate icon"type="image/png"href="../../static.files/favicon-32x32-422f7d1d52889060.png"><linkrel="icon"type="image/svg+xml"href="../../static.files/favicon-2c020d218678b618.svg"><linkrel="stylesheet"href="https://cdn.jsdelivr.net/npm/katex@0.10.0/dist/katex.min.css"integrity="sha384-9eLZqc9ds8eNjO3TmqPeYcDj8n+Qfa4nuSiGYa6DjLNcv9BtN69ZIulL9+8CqC9Y"crossorigin="anonymous">
</head><bodyclass="rustdoc struct"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><navclass="mobile-topbar"><buttonclass="sidebar-menu-toggle">☰</button><aclass="sidebar-logo"href="../../halo2_gadgets/index.html"><divclass="logo-container"><imgclass="rust-logo"src="../../static.files/rust-logo-151179464ae7ed46.svg"alt="logo"></div></a><h2></h2></nav><navclass="sidebar"><aclass="sidebar-logo"href="../../halo2_gadgets/index.html"><divclass="logo-container"><imgclass="rust-logo"src="../../static.files/rust-logo-151179464ae7ed46.svg"alt="logo"></div></a><h2class="location"><ahref="#">Table16Chip</a></h2><divclass="sidebar-elems"><section><h3><ahref="#implementations">Methods</a></h3><ulclass="block"><li><ahref="#method.configure">configure</a></li><li><ahref="#method.construct">construct</a></li><li><ahref="#method.load">load</a></li></ul><h3><ahref="#trait-implementations">Trait Implementations</a></h3><ulclass="block"><li><ahref="#impl-Chip%3CFp%3E-for-Table16Chip">Chip<Fp></a></li><li><ahref="#impl-Clone-for-Table16Chip">Clone</a></li><li><ahref="#impl-Debug-for-Table16Chip">Debug</a></li><li><ahref="#impl-Sha256Instructions%3CFp%3E-for-Table16Chip">Sha256Instructions<Fp></a></li></ul><h3><ahref="#synthetic-implementations">Auto Trait Implementations</a></h3><ulclass="block"><li><ahref="#impl-RefUnwindSafe-for-Table16Chip">RefUnwindSafe</a></li><li><ahref="#impl-Send-for-Table16Chip">Send</a></li><li><ahref="#impl-Sync-for-Table16Chip">Sync</a></li><li><ahref="#impl-Unpin-for-Table16Chip">Unpin</a></li><li><ahref="#impl-UnwindSafe-for-Table16Chip">UnwindSafe</a></li></ul><h3><ahref="#blanket-implementations">Blanket Implementations</a></h3><ulclass="block"><li><ahref="#impl-Any-for-Table16Chip">Any</a></li><li><ahref="#impl-Borrow%3CT%3E-for-Table16Chip">Borrow<T></a></li><li><ahref="#impl-BorrowMut%3CT%3E-for-Table16Chip">BorrowMut<T></a></li><li><ahref="#impl-Conv-for-Table16Chip">Conv</a></li><li><ahref="#impl-FmtForward-for-Table16Chip">FmtForward</a></li><li><ahref="#impl-From%3CT%3E-for-Table16Chip">From<T></a></li><li><ahref="#impl-Instrument-for-Table16Chip">Instrument</a></li><li><ahref="#impl-Into%3CU%3E-for-Table16Chip">Into<U></a></li><li><ahref="#impl-Pipe-for-Table16Chip">Pipe</a></li><li><ahref="#impl-Pointable-for-Table16Chip">Pointable</a></li><li><ahref="#impl-Tap-for-Table16Chip">Tap</a></li><li><ahref="#impl-ToOwned-for-Table16Chip">ToOwned</a></li><li><ahref="#impl-TryConv-for-Table16Chip">TryConv</a></li><li><ahref="#impl-TryFrom%3CU%3E-for-Table16Chip">TryFrom<U></a></li><li><ahref="#impl-TryInto%3CU%3E-for-Table16Chip">TryInto<U></a></li><li><ahref="#impl-VZip%3CV%3E-for-Table16Chip">VZip<V></a></li><li><ahref="#impl-WithSubscriber-for-Table16Chip">WithSubscriber</a></li></ul></section><h2><ahref="index.html">In halo2_gadgets::sha256</a></h2></div></nav><main><divclass="width-limiter"><navclass="sub"><formclass="search-form"><span></span><inputclass="search-input"name="search"autocomplete="off"spellcheck="false"placeholder="Click or press ‘S’ to search, ‘?’ for more options…"type="search"><divid="help-button"title="help"tabindex="-1"><ahref="../../help.html">?</a></div><divid="settings-menu"tabindex="-1"><ahref="../../settings.html"title="settings"><imgwidth="22"height="22"alt="Change settings"src="../../static.files/wheel-5ec35bf9ca753509.svg"></a></div></form></nav><sectionid="main-content"class="content"><divclass="main-heading"><h1class="fqn">Struct <ahref="../index.html">halo2_gadgets</a>::<wbr><ahref="index.html">sha256</a>::<wbr><aclass="struct"href="#">Table16Chip</a><buttonid="copy-path"onclick="copy_path(this)"title="Copy item path to clipboard"><imgsrc="../../static.files/clipboard-7571035ce49a181d.svg"width="19"height="18"alt="Copy item path"></button></h1><spanclass="out-of-band"><aclass="srclink"href="../../src/halo2_gadgets/sha256/table
</div></details><h2id="implementations"class="small-section-header">Implementations<ahref="#implementations"class="anchor"></a></h2><divid="implementations-list"><detailsclass="rustdoc-toggle implementors-toggle"open><summary><sectionid="impl-Table16Chip"class="impl has-srclink"><aclass="srclink rightside"href="../../src/halo2_gadgets/sha256/table16.rs.html#258-327">source</a><ahref="#impl-Table16Chip"class="anchor"></a><h3class="code-header">impl <aclass="struct"href="struct.Table16Chip.html"title="struct halo2_gadgets::sha256::Table16Chip">Table16Chip</a></h3></section></summary><divclass="impl-items"><detailsclass="rustdoc-toggle method-toggle"open><summary><sectionid="method.construct"class="method has-srclink"><aclass="srclink rightside"href="../../src/halo2_gadgets/sha256/table16.rs.html#260-265">source</a><h4class="code-header">pub fn <ahref="#method.construct"class="fnname">construct</a>(config: <Self as Chip<Base>>::Config) -> Self</h4></section></summary><divclass="docblock"><p>Reconstructs this chip from the given config.</p>
</div></details><detailsclass="rustdoc-toggle method-toggle"open><summary><sectionid="method.configure"class="method has-srclink"><aclass="srclink rightside"href="../../src/halo2_gadgets/sha256/table16.rs.html#268-318">source</a><h4class="code-header">pub fn <ahref="#method.configure"class="fnname">configure</a>(<br> meta: &mut ConstraintSystem<Base><br>) -><Self as Chip<Base>>::Config</h4></section></summary><divclass="docblock"><p>Configures a circuit to include this chip.</p>
</div></details><detailsclass="rustdoc-toggle method-toggle"open><summary><sectionid="method.load"class="method has-srclink"><aclass="srclink rightside"href="../../src/halo2_gadgets/sha256/table16.rs.html#321-326">source</a><h4class="code-header">pub fn <ahref="#method.load"class="fnname">load</a>(<br> config: <aclass="struct"href="struct.Table16Config.html"title="struct halo2_gadgets::sha256::Table16Config">Table16Config</a>,<br> layouter: &mut impl Layouter<Base><br>) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html"title="enum core::result::Result">Result</a><<aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Error></h4></section></summary><divclass="docblock"><p>Loads the lookup table required by this chip into the circuit.</p>
</div></details></div></details></div><h2id="trait-implementations"class="small-section-header">Trait Implementations<ahref="#trait-implementations"class="anchor"></a></h2><divid="trait-implementations-list"><detailsclass="rustdoc-toggle implementors-toggle"open><summary><sectionid="impl-Chip%3CFp%3E-for-Table16Chip"class="impl has-srclink"><aclass="srclink rightside"href="../../src/halo2_gadgets/sha256/table16.rs.html#245-256">source</a><ahref="#impl-Chip%3CFp%3E-for-Table16Chip"class="anchor"></a><h3class="code-header">impl Chip<Fp> for <aclass="struct"href="struct.Table16Chip.html"title="struct halo2_gadgets::sha256::Table16Chip">Table16Chip</a></h3></section></summary><divclass="impl-items"><detailsclass="rustdoc-toggle"open><summary><sectionid="associatedtype.Config"class="associatedtype trait-impl has-srclink"><ahref="#associatedtype.Config"class="anchor"></a><h4class="code-header">type <aclass="associatedtype">Config</a> = <aclass="struct"href="struct.Table16Config.html"title="struct halo2_gadgets::sha256::Table16Config">Table16Config</a></h4></section></summary><divclass='docblock'>A type that holds the configuration for this chip, and any other state it may need
during circuit synthesis, that can be derived during <ahref="crate::plonk::Circuit::configure"><code>Circuit::configure</code></a>. <a>Read more</a></div></details><detailsclass="rustdoc-toggle"open><summary><sectionid="associatedtype.Loaded"class="associatedtype trait-impl has-srclink"><ahref="#associatedtype.Loaded"class="anchor"></a><h4class="code-header">type <aclass="associatedtype">Loaded</a> = <aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a></h4></section></summary><divclass='docblock'>A type that holds any general chip state that needs to be loaded at the start of
<ahref="crate::plonk::Circuit::synthesize"><code>Circuit::synthesize</code></a>. This might simply be <code>()</code> for some chips. <a>Read more</a></div></details><detailsclass="rustdoc-toggle method-toggle"open><summary><sectionid="method.config"class="method trait-impl has-srclink"><aclass="srclink rightside"href="../../src/halo2_gadgets/sha256/table16.rs.html#249-251">source</a><ahref="#method.config"class="anchor"></a><h4class="code-header">fn <aclass="fnname">config</a>(&self) ->&Self::Config</h4></section></summary><divclass='docblock'>The chip holds its own configuration.</div></details><detailsclass="rustdoc-toggle method-toggle"open><summary><sectionid="method.loaded"class="method trait-impl has-srclink"><aclass="srclink rightside"href="../../src/halo2_gadgets/sha256/table16.rs.html#253-255">source</a><ahref="#method.loaded"class="anchor"></a><h4class="code-header">fn <aclass="fnname">loaded</a>(&self) ->&Self::Loaded</h4></section></summary><divclass='docblock'>Provides access to general chip state loaded at the beginning of circuit
function. <ahref="trait.Sha256Instructions.html#associatedtype.BlockWord">Read more</a></div></details><detailsclass="rustdoc-toggle method-toggle"open><summary><sectionid="method.initialization_vector"class="method trait-impl has-srclink"><aclass="srclink rightside"href="../../src/halo2_gadgets/sha256/table16.rs.html#333-338">source</a><ahref="#method.initialization_vector"class="anchor"></a><h4class="code-header">fn <ahref="trait.Sha256Instructions.html#tymethod.initialization_vector"class="fnname">initialization_vector</a>(<br> &self,<br> layouter: &mut impl Layouter<Base><br>) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html"title="enum core::result::Result">Result</a><State, Error></h4></section></summary><divclass='docblock'>Places the SHA-256 IV in the circuit, returning the initial state variable.</div></details><detailsclass="rustdoc-toggle method-toggle"open><summary><sectionid="method.initialization"class="method trait-impl has-srclink"><aclass="srclink rightside"href="../../src/halo2_gadgets/sha256/table16.rs.html#340-348">source</a><ahref="#method.initialization"class="anchor"></a><h4class="code-header">fn <ahref="trait.Sha256Instructions.html#tymethod.initialization"class="fnname">initialization</a>(<br> &self,<br> layouter: &mut impl Layouter<Base>,<br> init_state: &Self::<aclass="associatedtype"href="trait.Sha256Instructions.html#associatedtype.State"title="type halo2_gadgets::sha256::Sha256Instructions::State">State</a><br>) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html"title="enum core::result::Result">Result</a><Self::<aclass="associatedtype"href="trait.Sha256Instructions.html#associatedtype.State"title="type halo2_gadgets::sha256::Sha256Instructions::State">State</a>, Error></h4></section></summary><divclass='docblock'>Creates an initial state from the output state of a previous block</div></details><detailsclass="rustdoc-toggle method-toggle"open><summary><sectionid="method.compress"class="method trait-impl has-srclink"><aclass="srclink rightside"href="../../src/halo2_gadgets/sha256/table16.rs.html#352-363">source</a><ahref="#method.compress"class="anchor"></a><h4class="code-header">fn <ahref="trait.Sha256Instructions.html#tymethod.compress"class="fnname">compress</a>(<br> &self,<br> layouter: &mut impl Layouter<Base>,<br> initialized_state: &Self::<aclass="associatedtype"href="trait.Sha256Instructions.html#associatedtype.State"title="type halo2_gadgets::sha256::Sha256Instructions::State">State</a>,<br> input: [Self::<aclass="associatedtype"href="trait.Sha256Instructions.html#associatedtype.BlockWord"title="type halo2_gadgets::sha256::Sha256Instructions::BlockWord">BlockWord</a>; <aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.array.html">16</a>]<br>) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html"title="enum core::result::Result">Result</a><Self::<aclass="associatedtype"href="trait.Sha256Instructions.html#associatedtype.State"title="type halo2_gadgets::sha256::Sha256Instructions::State">State</a>, Error></h4></section></summary><divclass='docblock'>Starting from the given initialized state, processes a block of input and returns the
<code>Debug</code>-formatted. <a>Read more</a></div></details><detailsclass="rustdoc-toggle method-toggle"open><summary><sectionid="method.fmt_lower_exp"class="method trait-impl has-srclink"><ahref="#method.fmt_lower_exp"class="anchor"></a><h4class="code-header">fn <aclass="fnname">fmt_lower_exp</a>(self) -> FmtLowerExp<Self><spanclass="where fmt-newline">where<br> Self: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/fmt/trait.LowerExp.html"title="trait core::fmt::LowerExp">LowerExp</a>,</span></h4></section></summary><divclass='docblock'>Causes <code>self</code> to use its <code>LowerExp</code> implementation when
<code>Debug</code>-formatted. <a>Read more</a></div></details><detailsclass="rustdoc-toggle method-toggle"open><summary><sectionid="method.fmt_lower_hex"class="method trait-impl has-srclink"><ahref="#method.fmt_lower_hex"class="anchor"></a><h4class="code-header">fn <aclass="fnname">fmt_lower_hex</a>(self) -> FmtLowerHex<Self><spanclass="where fmt-newline">where<br> Self: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/fmt/trait.LowerHex.html"title="trait core::fmt::LowerHex">LowerHex</a>,</span></h4></section></summary><divclass='docblock'>Causes <code>self</code> to use its <code>LowerHex</code> implementation when
<code>Debug</code>-formatted. <a>Read more</a></div></details><detailsclass="rustdoc-toggle method-toggle"open><summary><sectionid="method.fmt_octal"class="method trait-impl has-srclink"><ahref="#method.fmt_octal"class="anchor"></a><h4class="code-header">fn <aclass="fnname">fmt_octal</a>(self) -> FmtOctal<Self><spanclass="where fmt-newline">where<br> Self: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/fmt/trait.Octal.html"title="trait core::fmt::Octal">Octal</a>,</span></h4></section></summary><divclass='docblock'>Causes <code>self</code> to use its <code>Octal</code> implementation when <code>Debug</code>-formatted.</div></details><detailsclass="rustdoc-toggle method-toggle"open><summary><sectionid="method.fmt_pointer"class="method trait-impl has-srclink"><ahref="#method.fmt_pointer"class="anchor"></a><h4class="code-header">fn <aclass="fnname">fmt_pointer</a>(self) -> FmtPointer<Self><spanclass="where fmt-newline">where<br> Self: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/fmt/trait.Pointer.html"title="trait core::fmt::Pointer">Pointer</a>,</span></h4></section></summary><divclass='docblock'>Causes <code>self</code> to use its <code>Pointer</code> implementation when
<code>Debug</code>-formatted. <a>Read more</a></div></details><detailsclass="rustdoc-toggle method-toggle"open><summary><sectionid="method.fmt_upper_exp"class="method trait-impl has-srclink"><ahref="#method.fmt_upper_exp"class="anchor"></a><h4class="code-header">fn <aclass="fnname">fmt_upper_exp</a>(self) -> FmtUpperExp<Self><spanclass="where fmt-newline">where<br> Self: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/fmt/trait.UpperExp.html"title="trait core::fmt::UpperExp">UpperExp</a>,</span></h4></section></summary><divclass='docblock'>Causes <code>self</code> to use its <code>UpperExp</code> implementation when
<code>Debug</code>-formatted. <a>Read more</a></div></details><detailsclass="rustdoc-toggle method-toggle"open><summary><sectionid="method.fmt_upper_hex"class="method trait-impl has-srclink"><ahref="#method.fmt_upper_hex"class="anchor"></a><h4class="code-header">fn <aclass="fnname">fmt_upper_hex</a>(self) -> FmtUpperHex<Self><spanclass="where fmt-newline">where<br> Self: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/fmt/trait.UpperHex.html"title="trait core::fmt::UpperHex">UpperHex</a>,</span></h4></section></summary><divclass='docblock'>Causes <code>self</code> to use its <code>UpperHex</code> implementation when
</div></details></div></details><detailsclass="rustdoc-toggle implementors-toggle"><summary><sectionid="impl-Instrument-for-Table16Chip"class="impl has-srclink"><aclass="srclink rightside"href="https://docs.rs/tracing/0.1.37/src/tracing/instrument.rs.html#276">source</a><ahref="#impl-Instrument-for-Table16Chip"class="anchor"></a><h3class="code-header">impl<T><aclass="trait"href="https://docs.rs/tracing/0.1.37/tracing/instrument/trait.Instrument.html"title="trait tracing::instrument::Instrument">Instrument</a> for T</h3></section></summary><divclass="impl-items"><detailsclass="rustdoc-toggle method-toggle"open><summary><sectionid="method.instrument"class="method trait-impl has-srclink"><aclass="srclink rightside"href="https://docs.rs/tracing/0.1.37/src/tracing/instrument.rs.html#82">source</a><ahref="#method.instrument"class="anchor"></a><h4class="code-header">fn <ahref="https://docs.rs/tracing/0.1.37/tracing/instrument/trait.Instrument.html#method.instrument"class="fnname">instrument</a>(self, span: <aclass="struct"href="https://docs.rs/tracing/0.1.37/tracing/span/struct.Span.html"title="struct tracing::span::Span">Span</a>) -><aclass="struct"href="https://docs.rs/tracing/0.1.37/tracing/instrument/struct.Instrumented.html"title="struct tracing::instrument::Instrumented">Instrumented</a><Self></h4></section></summary><divclass='docblock'>Instruments this type with the provided <ahref="https://docs.rs/tracing/0.1.37/tracing/span/struct.Span.html"title="Span"><code>Span</code></a>, returning an
<code>Instrumented</code> wrapper. <ahref="https://docs.rs/tracing/0.1.37/tracing/instrument/trait.Instrument.html#method.instrument">Read more</a></div></details><detailsclass="rustdoc-toggle method-toggle"open><summary><sectionid="method.in_current_span"class="method trait-impl has-srclink"><aclass="srclink rightside"href="https://docs.rs/tracing/0.1.37/src/tracing/instrument.rs.html#121">source</a><ahref="#method.in_current_span"class="anchor"></a><h4class="code-header">fn <ahref="https://docs.rs/tracing/0.1.37/tracing/instrument/trait.Instrument.html#method.in_current_span"class="fnname">in_current_span</a>(self) -><aclass="struct"href="https://docs.rs/tracing/0.1.37/tracing/instrument/struct.Instrumented.html"title="struct tracing::instrument::Instrumented">Instrumented</a><Self></h4></section></summary><divclass='docblock'>Instruments this type with the <ahref="https://docs.rs/tracing/0.1.37/tracing/span/struct.Span.html#method.current">current</a><ahref="https://docs.rs/tracing/0.1.37/tracing/span/struct.Span.html"><code>Span</code></a>, returning an
<ahref="https://docs.rs/tracing/0.1.37/tracing/instrument/struct.WithDispatch.html"title="WithDispatch"><code>WithDispatch</code></a> wrapper. <ahref="https://docs.rs/tracing/0.1.37/tracing/instrument/trait.WithSubscriber.html#method.with_subscriber">Read more</a></div></details><detailsclass="rustdoc-toggle method-toggle"open><summary><sectionid="method.with_current_subscriber"class="method trait-impl has-srclink"><aclass="srclink rightside"href="https://docs.rs/tracing/0.1.37/src/tracing/instrument.rs.html#221">source</a><ahref="#method.with_current_subscriber"class="anchor"></a><h4class="code-header">fn <ahref="https://docs.rs/tracing/0.1.37/tracing/instrument/trait.WithSubscriber.html#method.with_current_subscriber"class="fnname">with_current_subscriber</a>(self) -><aclass="struct"href="https://docs.rs/tracing/0.1.37/tracing/instrument/struct.WithDispatch.html"title="struct tracing::instrument::WithDispatch">WithDispatch</a><Self></h4></section></summary><divclass='docblock'>Attaches the current <ahref="https://docs.rs/tracing/0.1.37/tracing/dispatcher/index.html#setting-the-default-subscriber">default</a><ahref="https://docs.rs/tracing-core/0.1.22/tracing_core/subscriber/trait.Subscriber.html"><code>Subscriber</code></a> to this type, returning a