syntax_data: {"ast_node_type":"variable","tokens":[{"end":87,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let ExprKind::Scope { value, lint_level, region_scope } = v.kind else {
context_before:                 let v = &this.thir[value];
context_after:                     span_bug!(v.span, "`thir_check_tail_calls` should have disallowed this {v:?}")