syntax_data: {"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// coroutine-closure. This signature parts type will have the general
context_before:     /// Represents all of the relevant parts of the coroutine returned by this
context_after:     /// shape of `fn(tupled_inputs, resume_ty) -> (return_ty, yield_ty)`, where