{"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"|"}]}
            | (types::F32, types::F64 | types::F128)
            (types::F16, types::F32 | types::F64 | types::F128)
            | (types::F64, types::F128) => fx.bcx.ins().fpromote(to_ty, from),