{"ast_node_type":"variable","tokens":[{"end":67,"kind":"keyword","start":0,"text":"let"}]}
            let const_loc = bx.tcx().span_as_caller_location(span);
        self.mir.caller_location_span(source_info, self.caller_location, bx.tcx(), |span: Span| {
            OperandRef::from_const(bx, const_loc, bx.tcx().caller_location_ty())