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</pre><pre class='rust '>
<span class='doccomment'>//! This module contains `Impossible` serializer and its implementations.</span>
<span class='kw'>use</span> <span class='ident'>core</span>::<span class='ident'>marker</span>::<span class='ident'>PhantomData</span>;
<span class='kw'>use</span> <span class='ident'>ser</span>::{<span class='self'>self</span>, <span class='ident'>Serialize</span>, <span class='ident'>SerializeSeq</span>, <span class='ident'>SerializeTuple</span>, <span class='ident'>SerializeTupleStruct</span>,
<span class='ident'>SerializeTupleVariant</span>, <span class='ident'>SerializeMap</span>, <span class='ident'>SerializeStruct</span>, <span class='ident'>SerializeStructVariant</span>};
<span class='doccomment'>/// Helper type for implementing a `Serializer` that does not support</span>
<span class='doccomment'>/// serializing one of the compound types.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This type cannot be instantiated, but implements every one of the traits</span>
<span class='doccomment'>/// corresponding to the `Serializer` compound types: `SerializeSeq`,</span>
<span class='doccomment'>/// `SerializeTuple`, `SerializeTupleStruct`, `SerializeTupleVariant`,</span>
<span class='doccomment'>/// `SerializeMap`, `SerializeStruct`, and `SerializeStructVariant`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// ```rust,ignore</span>
<span class='doccomment'>/// impl Serializer for MySerializer {</span>
<span class='doccomment'>/// type Ok = ();</span>
<span class='doccomment'>/// type Error = Error;</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// type SerializeSeq = Impossible<(), Error>;</span>
<span class='doccomment'>/// /* other associated types */</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// /// This data format does not support serializing sequences.</span>
<span class='doccomment'>/// fn serialize_seq(self,</span>
<span class='doccomment'>/// len: Option<usize>)</span>
<span class='doccomment'>/// -> Result<Self::SerializeSeq, Error> {</span>
<span class='doccomment'>/// // Given Impossible cannot be instantiated, the only</span>
<span class='doccomment'>/// // thing we can do here is to return an error.</span>
<span class='doccomment'>/// Err(...)</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// /* other Serializer methods */</span>
<span class='doccomment'>/// }</span>
<span class='doccomment'>/// ```</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Impossible</span><span class='op'><</span><span class='prelude-val'>Ok</span>, <span class='ident'>E</span><span class='op'>></span> {
<span class='ident'>void</span>: <span class='ident'>Void</span>,
<span class='ident'>_marker</span>: <span class='ident'>PhantomData</span><span class='op'><</span>(<span class='prelude-val'>Ok</span>, <span class='ident'>E</span>)<span class='op'>></span>,
}
<span class='kw'>enum</span> <span class='ident'>Void</span> {}
<span class='kw'>impl</span><span class='op'><</span><span class='prelude-val'>Ok</span>, <span class='ident'>E</span><span class='op'>></span> <span class='ident'>SerializeSeq</span> <span class='kw'>for</span> <span class='ident'>Impossible</span><span class='op'><</span><span class='prelude-val'>Ok</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>ser</span>::<span class='ident'>Error</span>
{
<span class='kw'>type</span> <span class='prelude-val'>Ok</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>;
<span class='kw'>type</span> <span class='ident'>Error</span> <span class='op'>=</span> <span class='ident'>E</span>;
<span class='kw'>fn</span> <span class='ident'>serialize_element</span><span class='op'><</span><span class='ident'>T</span>: <span class='question-mark'>?</span><span class='ident'>Sized</span> <span class='op'>+</span> <span class='ident'>Serialize</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>_value</span>: <span class='kw-2'>&</span><span class='ident'>T</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span>(), <span class='ident'>E</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>void</span> {}
}
<span class='kw'>fn</span> <span class='ident'>end</span>(<span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='prelude-val'>Ok</span>, <span class='ident'>E</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>void</span> {}
}
}
<span class='kw'>impl</span><span class='op'><</span><span class='prelude-val'>Ok</span>, <span class='ident'>E</span><span class='op'>></span> <span class='ident'>SerializeTuple</span> <span class='kw'>for</span> <span class='ident'>Impossible</span><span class='op'><</span><span class='prelude-val'>Ok</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>ser</span>::<span class='ident'>Error</span>
{
<span class='kw'>type</span> <span class='prelude-val'>Ok</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>;
<span class='kw'>type</span> <span class='ident'>Error</span> <span class='op'>=</span> <span class='ident'>E</span>;
<span class='kw'>fn</span> <span class='ident'>serialize_element</span><span class='op'><</span><span class='ident'>T</span>: <span class='question-mark'>?</span><span class='ident'>Sized</span> <span class='op'>+</span> <span class='ident'>Serialize</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>_value</span>: <span class='kw-2'>&</span><span class='ident'>T</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span>(), <span class='ident'>E</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>void</span> {}
}
<span class='kw'>fn</span> <span class='ident'>end</span>(<span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='prelude-val'>Ok</span>, <span class='ident'>E</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>void</span> {}
}
}
<span class='kw'>impl</span><span class='op'><</span><span class='prelude-val'>Ok</span>, <span class='ident'>E</span><span class='op'>></span> <span class='ident'>SerializeTupleStruct</span> <span class='kw'>for</span> <span class='ident'>Impossible</span><span class='op'><</span><span class='prelude-val'>Ok</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>ser</span>::<span class='ident'>Error</span>
{
<span class='kw'>type</span> <span class='prelude-val'>Ok</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>;
<span class='kw'>type</span> <span class='ident'>Error</span> <span class='op'>=</span> <span class='ident'>E</span>;
<span class='kw'>fn</span> <span class='ident'>serialize_field</span><span class='op'><</span><span class='ident'>T</span>: <span class='question-mark'>?</span><span class='ident'>Sized</span> <span class='op'>+</span> <span class='ident'>Serialize</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>_value</span>: <span class='kw-2'>&</span><span class='ident'>T</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span>(), <span class='ident'>E</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>void</span> {}
}
<span class='kw'>fn</span> <span class='ident'>end</span>(<span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='prelude-val'>Ok</span>, <span class='ident'>E</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>void</span> {}
}
}
<span class='kw'>impl</span><span class='op'><</span><span class='prelude-val'>Ok</span>, <span class='ident'>E</span><span class='op'>></span> <span class='ident'>SerializeTupleVariant</span> <span class='kw'>for</span> <span class='ident'>Impossible</span><span class='op'><</span><span class='prelude-val'>Ok</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>ser</span>::<span class='ident'>Error</span>
{
<span class='kw'>type</span> <span class='prelude-val'>Ok</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>;
<span class='kw'>type</span> <span class='ident'>Error</span> <span class='op'>=</span> <span class='ident'>E</span>;
<span class='kw'>fn</span> <span class='ident'>serialize_field</span><span class='op'><</span><span class='ident'>T</span>: <span class='question-mark'>?</span><span class='ident'>Sized</span> <span class='op'>+</span> <span class='ident'>Serialize</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>_value</span>: <span class='kw-2'>&</span><span class='ident'>T</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span>(), <span class='ident'>E</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>void</span> {}
}
<span class='kw'>fn</span> <span class='ident'>end</span>(<span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='prelude-val'>Ok</span>, <span class='ident'>E</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>void</span> {}
}
}
<span class='kw'>impl</span><span class='op'><</span><span class='prelude-val'>Ok</span>, <span class='ident'>E</span><span class='op'>></span> <span class='ident'>SerializeMap</span> <span class='kw'>for</span> <span class='ident'>Impossible</span><span class='op'><</span><span class='prelude-val'>Ok</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>ser</span>::<span class='ident'>Error</span>
{
<span class='kw'>type</span> <span class='prelude-val'>Ok</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>;
<span class='kw'>type</span> <span class='ident'>Error</span> <span class='op'>=</span> <span class='ident'>E</span>;
<span class='kw'>fn</span> <span class='ident'>serialize_key</span><span class='op'><</span><span class='ident'>T</span>: <span class='question-mark'>?</span><span class='ident'>Sized</span> <span class='op'>+</span> <span class='ident'>Serialize</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>_key</span>: <span class='kw-2'>&</span><span class='ident'>T</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span>(), <span class='ident'>E</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>void</span> {}
}
<span class='kw'>fn</span> <span class='ident'>serialize_value</span><span class='op'><</span><span class='ident'>T</span>: <span class='question-mark'>?</span><span class='ident'>Sized</span> <span class='op'>+</span> <span class='ident'>Serialize</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>_value</span>: <span class='kw-2'>&</span><span class='ident'>T</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span>(), <span class='ident'>E</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>void</span> {}
}
<span class='kw'>fn</span> <span class='ident'>end</span>(<span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='prelude-val'>Ok</span>, <span class='ident'>E</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>void</span> {}
}
}
<span class='kw'>impl</span><span class='op'><</span><span class='prelude-val'>Ok</span>, <span class='ident'>E</span><span class='op'>></span> <span class='ident'>SerializeStruct</span> <span class='kw'>for</span> <span class='ident'>Impossible</span><span class='op'><</span><span class='prelude-val'>Ok</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>ser</span>::<span class='ident'>Error</span>
{
<span class='kw'>type</span> <span class='prelude-val'>Ok</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>;
<span class='kw'>type</span> <span class='ident'>Error</span> <span class='op'>=</span> <span class='ident'>E</span>;
<span class='kw'>fn</span> <span class='ident'>serialize_field</span><span class='op'><</span><span class='ident'>T</span>: <span class='question-mark'>?</span><span class='ident'>Sized</span> <span class='op'>+</span> <span class='ident'>Serialize</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>,
<span class='ident'>_key</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span>,
<span class='ident'>_value</span>: <span class='kw-2'>&</span><span class='ident'>T</span>)
<span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span>(), <span class='ident'>E</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>void</span> {}
}
<span class='kw'>fn</span> <span class='ident'>end</span>(<span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='prelude-val'>Ok</span>, <span class='ident'>E</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>void</span> {}
}
}
<span class='kw'>impl</span><span class='op'><</span><span class='prelude-val'>Ok</span>, <span class='ident'>E</span><span class='op'>></span> <span class='ident'>SerializeStructVariant</span> <span class='kw'>for</span> <span class='ident'>Impossible</span><span class='op'><</span><span class='prelude-val'>Ok</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>ser</span>::<span class='ident'>Error</span>
{
<span class='kw'>type</span> <span class='prelude-val'>Ok</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>;
<span class='kw'>type</span> <span class='ident'>Error</span> <span class='op'>=</span> <span class='ident'>E</span>;
<span class='kw'>fn</span> <span class='ident'>serialize_field</span><span class='op'><</span><span class='ident'>T</span>: <span class='question-mark'>?</span><span class='ident'>Sized</span> <span class='op'>+</span> <span class='ident'>Serialize</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>,
<span class='ident'>_key</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span>,
<span class='ident'>_value</span>: <span class='kw-2'>&</span><span class='ident'>T</span>)
<span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span>(), <span class='ident'>E</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>void</span> {}
}
<span class='kw'>fn</span> <span class='ident'>end</span>(<span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='prelude-val'>Ok</span>, <span class='ident'>E</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>void</span> {}
}
}
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<h2>Keyboard Shortcuts</h2>
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<dt>?</dt>
<dd>Show this help dialog</dd>
<dt>S</dt>
<dd>Focus the search field</dd>
<dt>⇤</dt>
<dd>Move up in search results</dd>
<dt>⇥</dt>
<dd>Move down in search results</dd>
<dt>⏎</dt>
<dd>Go to active search result</dd>
<dt>+</dt>
<dd>Collapse/expand all sections</dd>
</dl>
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<div class="infos">
<h2>Search Tricks</h2>
<p>
Prefix searches with a type followed by a colon (e.g.
<code>fn:</code>) to restrict the search to a given type.
</p>
<p>
Accepted types are: <code>fn</code>, <code>mod</code>,
<code>struct</code>, <code>enum</code>,
<code>trait</code>, <code>type</code>, <code>macro</code>,
and <code>const</code>.
</p>
<p>
Search functions by type signature (e.g.
<code>vec -> usize</code> or <code>* -> vec</code>)
</p>
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