{"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"//"}]}
            // instantiate it, and take the type of its only method as our own.
            // We're either a closure or a coroutine. Our goal is to find the trait we're defined on,
            let closure_ty = instance.ty(tcx, ty::TypingEnv::fully_monomorphized());