Trait frunk_core::hlist::HList
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pub trait HList: Sized { fn length(&self) -> u32; fn prepend<H>(self, h: H) -> HCons<H, Self> { ... } }
Typeclass for HList-y behaviour
An HList is a heterogeneous list, one that is statically typed at compile time. In simple terms, it is just an arbitrarily-nested Tuple2.