syntax_data: {"ast_node_type":"other","tokens":[{"end":89,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // the parent captures `&s` but the child captures `&(s.field)`, then we will
context_before:             // to capture *to* the upvar of the parent coroutine-closure. For example, if
context_after:             // apply a field projection.