syntax_data: {"ast_node_type":"other","tokens":[{"end":34,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: ///   completion of the coroutine.
context_before: /// * `GR`: The "return type", which is the type of value returned upon
context_after: #[derive_where(Clone, Copy, PartialEq, Eq, Hash, Debug; I: Interner)]