{"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"bx.lifetime_start(scratch.llval,"}]}
                    bx.lifetime_start(scratch.llval, arg.layout.size);
                    let scratch = PlaceValue::alloca(bx, arg.layout.size, required_align);
                    op.val.store(bx, scratch.with_type(arg.layout));