syntax_data: {"ast_node_type":"struct","tokens":[{"end":85,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// Construct a coroutine from the closure signature. Since a coroutine signature
context_before: impl<I: Interner> CoroutineClosureSignature<I> {
context_after:     /// is agnostic to the type of generator that is returned (by-ref/by-move),