syntax_data: {"ast_node_type":"variable","tokens":[{"end":76,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let reason = attr.value_str().map(|s| errors::MustNotSuspendReason {
context_before:     if let Some(attr) = tcx.get_attr(def_id, sym::must_not_suspend) {
context_after:             span: data.source_span,