syntax_data: {"ast_node_type":"variable","tokens":[{"end":82,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let hir::ExprKind::Block(block_body, _) = rhs_expr.kind else {
context_after:                         dcx.emit_fatal(LoopMatchBadRhs { span: rhs_expr.span })