{"ast_node_type":"variable","tokens":[{"end":93,"kind":"keyword","start":0,"text":"let"}]}
        let head_span = self.mark_span_with_reason(DesugaringKind::ForLoop, head.span, None);
            self.mark_span_with_reason(DesugaringKind::ForLoop, self.lower_span(e.span), None);
        let pat_span = self.mark_span_with_reason(DesugaringKind::ForLoop, pat.span, None);