syntax_data: {"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // It also rewrites `return x` and `yield y` as writing a new coroutine state and returning
context_before:         // accesses for locals in `remap`.
context_after:         // either `CoroutineState::Complete(x)` and `CoroutineState::Yielded(y)`,