syntax_data: {"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// is agnostic to the type of generator that is returned (by-ref/by-move),
context_before:     /// Construct a coroutine from the closure signature. Since a coroutine signature
context_after:     /// the caller must specify what "flavor" of generator that they'd like to