syntax_data: {"ast_node_type":"variable","tokens":[{"end":79,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let region_scope = (region_scope, this.source_info(expr_span));
context_before:             ExprKind::Scope { region_scope, lint_level, value } => {
context_after:                 this.in_scope(region_scope, lint_level, |this| {