syntax_data: {"ast_node_type":"variable","tokens":[{"end":96,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                             let brace_span = sm.span_extend_to_next_char(scrut_span, '{', true);
context_before:                             let sm = self.tcx.sess.source_map();
context_after:                             if sm.span_to_snippet(sm.next_point(brace_span)).as_deref() == Ok("{") {