syntax_data: {"ast_node_type":"other","tokens":[{"end":89,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // currently transforming *from* the old upvar that the by-ref coroutine used
context_before:             // These projections are applied in order to "bridge" the local that we are
context_after:             // to capture *to* the upvar of the parent coroutine-closure. For example, if