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</pre><pre class='rust '>
<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'>de</span>::{<span class='ident'>Deserialize</span>, <span class='ident'>Deserializer</span>, <span class='ident'>Error</span>, <span class='ident'>Visitor</span>};
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>any</span>(<span class='ident'>feature</span> <span class='op'>=</span> <span class='string'>"std"</span>, <span class='ident'>feature</span> <span class='op'>=</span> <span class='string'>"collections"</span>))]</span>
<span class='kw'>pub</span> <span class='kw'>use</span> <span class='ident'>de</span>::<span class='ident'>content</span>::{<span class='ident'>Content</span>, <span class='ident'>ContentRefDeserializer</span>, <span class='ident'>ContentDeserializer</span>, <span class='ident'>TaggedContentVisitor</span>,
<span class='ident'>TagOrContentField</span>, <span class='ident'>TagOrContentFieldVisitor</span>, <span class='ident'>InternallyTaggedUnitVisitor</span>,
<span class='ident'>UntaggedUnitVisitor</span>};
<span class='doccomment'>/// If the missing field is of type `Option<T>` then treat is as `None`,</span>
<span class='doccomment'>/// otherwise it is an error.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>missing_field</span><span class='op'><</span><span class='ident'>V</span>, <span class='ident'>E</span><span class='op'>></span>(<span class='ident'>field</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Deserialize</span>,
<span class='ident'>E</span>: <span class='ident'>Error</span>
{
<span class='kw'>struct</span> <span class='ident'>MissingFieldDeserializer</span><span class='op'><</span><span class='ident'>E</span><span class='op'>></span>(<span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span>, <span class='ident'>PhantomData</span><span class='op'><</span><span class='ident'>E</span><span class='op'>></span>);
<span class='kw'>impl</span><span class='op'><</span><span class='ident'>E</span><span class='op'>></span> <span class='ident'>Deserializer</span> <span class='kw'>for</span> <span class='ident'>MissingFieldDeserializer</span><span class='op'><</span><span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>E</span>: <span class='ident'>Error</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'>deserialize</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>_visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>
{
<span class='prelude-val'>Err</span>(<span class='ident'>Error</span>::<span class='ident'>missing_field</span>(<span class='self'>self</span>.<span class='number'>0</span>))
}
<span class='kw'>fn</span> <span class='ident'>deserialize_option</span><span class='op'><</span><span class='ident'>V</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>visitor</span>: <span class='ident'>V</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>V</span>::<span class='ident'>Value</span>, <span class='ident'>E</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>V</span>: <span class='ident'>Visitor</span>
{
<span class='ident'>visitor</span>.<span class='ident'>visit_none</span>()
}
<span class='macro'>forward_to_deserialize</span><span class='macro'>!</span> {
<span class='ident'>bool</span> <span class='ident'>u8</span> <span class='ident'>u16</span> <span class='ident'>u32</span> <span class='ident'>u64</span> <span class='ident'>i8</span> <span class='ident'>i16</span> <span class='ident'>i32</span> <span class='ident'>i64</span> <span class='ident'>f32</span> <span class='ident'>f64</span> <span class='ident'>char</span> <span class='ident'>str</span> <span class='ident'>string</span> <span class='ident'>unit</span> <span class='ident'>seq</span>
<span class='ident'>seq_fixed_size</span> <span class='ident'>bytes</span> <span class='ident'>byte_buf</span> <span class='ident'>map</span> <span class='ident'>unit_struct</span> <span class='ident'>newtype_struct</span>
<span class='ident'>tuple_struct</span> <span class='kw'>struct</span> <span class='ident'>struct_field</span> <span class='ident'>tuple</span> <span class='kw'>enum</span> <span class='ident'>ignored_any</span>
}
}
<span class='kw'>let</span> <span class='ident'>deserializer</span> <span class='op'>=</span> <span class='ident'>MissingFieldDeserializer</span>(<span class='ident'>field</span>, <span class='ident'>PhantomData</span>);
<span class='ident'>Deserialize</span>::<span class='ident'>deserialize</span>(<span class='ident'>deserializer</span>)
}
</pre>
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