syntax_data: {"ast_node_type":"variable","tokens":[{"end":71,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let place_builder = if this.is_bound_var_in_guard(id) {
context_before:             ExprKind::VarRef { id } => {
context_after:                     let index = this.var_local_id(id, RefWithinGuard);