cargo liquid build error

[jewelzms]

根据说明文档 https://liquid-doc.readthedocs.io/zh_CN/latest/docs/quickstart/prerequisite.html 配置好环境之后。

尝试编译 HelloWorld 例子合约，开始遇到 proc-macro2 等一些依赖库报错，在修改 HelloWorld 示例合约部分依赖库版本之后继续编译，提示需要 edition2021 特性，编译出现如下错误：

[1/4] 🔍  Collecting crate metadata
[2/4] 🚚  Building cargo project
error: failed to parse manifest at `/tmp/cargo-xbuildqtQwtT/Cargo.toml`

Caused by:
  feature `edition2021` is required

  consider adding `cargo-features = ["edition2021"]` to the manifest
ERROR: Building with xargo

Caused by:
    `"/home/john/.rustup/toolchains/nightly-2021-06-23-x86_64-unknown-linux-gnu/bin/cargo" "rustc" "-p" "alloc" "--release" "--manifest-path" "/tmp/cargo-xbuildqtQwtT/Cargo.toml" "--target" "wasm32-unknown-unknown" "--" "-Z" "force-unstable-if-unmarked"` failed with exit code: Some(101)

根据提示修改 Cargo.toml，在文件顶部增加 cargo-features = ["edition2021"]，报错如下：

[1/4] 🔍  Collecting crate metadata
[2/4] 🚚  Building cargo project
   Compiling core v0.0.0 (/home/john/.rustup/toolchains/nightly-2021-06-23-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core)
   Compiling compiler_builtins v0.1.45
   Compiling rustc-std-workspace-core v1.99.0 (/home/john/.rustup/toolchains/nightly-2021-06-23-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/rustc-std-workspace-core)
   Compiling alloc v0.0.0 (/tmp/cargo-xbuildLJMsg2)
    Finished release [optimized] target(s) in 19.60s
error[E0463]: can't find crate for `std`
  |
  = note: the `wasm32-unknown-unknown` target may not support the standard library
  = note: `std` is required by `predicates_core` because it does not declare `#![no_std]`
  = help: consider building the standard library from source with `cargo build -Zbuild-std`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0463`.
error[E0463]: can't find crate for `std`
  |
  = note: the `wasm32-unknown-unknown` target may not support the standard library
  = note: `std` is required by `bumpalo` because it does not declare `#![no_std]`
  = help: consider building the standard library from source with `cargo build -Zbuild-std`

error: could not compile `predicates-core`

To learn more, run the command again with --verbose.
error: aborting due to previous error

For more information about this error, try `rustc --explain E0463`.
error: build failed
ERROR: xbuild failed with status exit status: 101

目前提供的编译链因为当时使用的版本老旧，很多库已升级（patch不兼容），使得编译链无法正常使用，似乎难以找到整套兼容的依赖。
官方有无好的解决方案，或是当时有无封装可用容器？

[bxq2011hust]

WeBankBlockchain/liquid#37

尝试一下这个issue中的操作

[jewelzms]

已看到最新版本对该问题的解决，非常感谢官方作者的艰苦付出，谢谢！