syntax_data: {"ast_node_type":"import","tokens":[{"end":75,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// When the kind and upvars are known, use the other helper functions.
context_before:     /// during typeck, when we want to put inference vars into the kind and upvars tys.
context_after:     pub fn to_coroutine(