{"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"//"}]}
// trait ref, and then go from the types in the substs back to the syntax).
// FIXME: It would probably be nicer if we could get this via HIR (i.e. get the
fn get_syntactic_substs(impl_def: ast::Impl) -> Option<AstSubsts> {