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<p>Please refer to the <ahref="index.html">crate level documentation</a> for explanation
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<br>
<p><strong>Define your own PhantomData and similarly behaved unit types.</strong></p>
<p><ahref="https://doc.rust-lang.org/std/marker/struct.PhantomData.html"><code>PhantomData</code></a> as defined by the Rust standard library is magical in that
the same type is impossible to define in ordinary Rust code. It is defined
<p>The <code>#[lang = "..."]</code> attribute indicates that this is a <ahref="https://manishearth.github.io/blog/2017/01/11/rust-tidbits-what-is-a-lang-item/">lang item</a>, a
special case known to the compiler. It is the only type permitted to carry
an unused type parameter.</p>
<p>If we try to define an equivalent unit struct with type parameter, the
<table><trclass="module-item"><td><aclass="attr"href="attr.phantom.html"title="ghost::phantom attr">phantom</a></td><tdclass="docblock-short"><p>Define your own PhantomData and similarly behaved unit types.</p>
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