pub type QSQuad<'a, TS> = <TS as IsQuadSource>::Quad<'a>;Expand description
Type alias to denote the type of quads yielded by a QuadSource.
Why not using TS::Item<'a> instead?
Source::Item being a generic associated type (GAT),
the compiler will not always “know” that TS::Item<'a> implements the Quad trait.
This type alias, on the other hand, will always be recognized as a Quad implementation.