syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // place to have storage *before* the yield, only after.
context_before:             // only when the coroutine is later resumed. Unlike `Call`, this doesn't require the
context_after:             TerminatorKind::Yield { .. } => {}