rust-sdk version: v1.1.4 rustc version: rustc 1.57.0-nightly (51e514c0f 2021-09-12) When I use `cargo b` in the folder `sgx_align_struct_attribute`, the following error is reported: ``` error[E0658]: use of unstable library feature 'proc_macro_is_available' --> /home/emison/.cargo/registry/src/mirrors.tuna.tsinghua.edu.cn-df7c3c540f42cdbd/proc-macro2-1.0.33/src/detection.rs:28:21 | 28 | let available = proc_macro::is_available(); | ^^^^^^^^^^^^^^^^^^^^^^^^ | = note: see issue #71436 <https://github.com/rust-lang/rust/issues/71436> for more information = help: add `#![feature(proc_macro_is_available)]` to the crate attributes to enable ```
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