syntax_data: {"ast_node_type":"other","tokens":[{"end":36,"kind":"keyword","start":0,"text":"ty::Error(_)"}]}
source_snippet:         ty::Error(_) => return None,
context_before:         ty::Coroutine(def_id, _) => tcx.coroutine_movability(def_id) == hir::Movability::Movable,
context_after:         _ => span_bug!(body.span, "unexpected coroutine type {}", coroutine_ty),