syntax_data: {"ast_node_type":"variable","tokens":[{"end":58,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let source_info = this.source_info(expr.span);
context_before:         if let ExprKind::Scope { region_scope, lint_level, value } = expr.kind {
context_after:             let region_scope = (region_scope, source_info);