{"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":"///"}]}
    /// where `base` is the `Option<Expr>`.
    /// E.g., `Foo {x: 1, y: 2}`, or `Foo {x: 1, .. base}`,
    Struct(&'hir QPath<'hir>, &'hir [ExprField<'hir>], StructTailExpr<'hir>),