syntax_data: {"ast_node_type":"variable","tokens":[{"end":80,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let adjusted_span = if let ExprKind::Block { block } = expr.kind
context_before:                 // than the entirety of block(s) surrounding it.
context_after:                     && let Some(tail_ex) = this.thir[block].expr