syntax_data: {"ast_node_type":"other","tokens":[{"end":76,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// This contains the `DefId` and the `GenericArgsRef` of the coroutine.
context_before:     ///
context_after:     /// The actual witness types are computed on MIR by the `mir_coroutine_witnesses` query.