syntax_data: {"ast_node_type":"variable","tokens":[{"end":83,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let bytes = cv.try_to_raw_bytes(self.tcx()).unwrap_or_else(|| {
context_before:                 ty::Slice(t) if *t == u8_type => {
context_after:                         bug!(