syntax_data: {"ast_node_type":"variable","tokens":[{"end":73,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let scrutinee_span = this.thir.exprs[scrutinee].span;
context_before:                         unpack!(body_block = this.as_place_builder(body_block, scrutinee));
context_after:                     let match_start_span = match_span.shrink_to_lo().to(scrutinee_span);