syntax_data: {"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                     // Iterator::next doesn't accept a pinned argument,
context_before:                 hir::CoroutineKind::Desugared(hir::CoroutineDesugaring::Gen, _) => {
context_after:                     // unlike for all other coroutine kinds.