在substrate.dev中构建失败油墨！教程 sp-aritmetic缺乏类型？

问题描述

我的构建失败。

在我使用以下命令测试合同之前，一切看起来都很好：

cargo +nightly test

我收到错误[E0282]

这是整个错误报告：

error[E0282]: type annotations needed
      --> /home/mal/.cargo/registry/src/github.com-1ecc6299db9ec823/sp-arithmetic-2.0.0/src/fixed_point.rs:541:9
       |
  541  |                   let accuracy = P::ACCURACY.saturated_into();
       |                       ^^^^^^^^ consider giving `accuracy` a type
  ...
  1595 | / implement_fixed!(
  1596 | |     FixedI64,1597 | |     test_fixed_i64,1598 | |     i64,...    |
  1601 | |     "_Fixed Point 64 bits signed,range = [-9223372036.854775808,9223372036.854775807]_",1602 | | );
       | |__- in this macro invocation
       |
       = note: this error originates in a macro (in Nightly builds,run with -Z macro-backtrace for more info)

  error[E0282]: type annotations needed
      --> /home/mal/.cargo/registry/src/github.com-1ecc6299db9ec823/sp-arithmetic-2.0.0/src/fixed_point.rs:541:9
       |
  541  |                   let accuracy = P::ACCURACY.saturated_into();
       |                       ^^^^^^^^ consider giving `accuracy` a type
  ...
  1604 | / implement_fixed!(
  1605 | |     FixedI128,1606 | |     test_fixed_i128,1607 | |     i128,...    |
  1611 | |         [-170141183460469231731.687303715884105728,170141183460469231731.687303715884105727]_",1612 | | );
       | |__- in this macro invocation
       |
       = note: this error originates in a macro (in Nightly builds,run with -Z macro-backtrace for more info)

  error[E0282]: type annotations needed
      --> /home/mal/.cargo/registry/src/github.com-1ecc6299db9ec823/sp-arithmetic-2.0.0/src/fixed_point.rs:541:9
       |
  541  |                   let accuracy = P::ACCURACY.saturated_into();
       |                       ^^^^^^^^ consider giving `accuracy` a type
  ...
  1614 | / implement_fixed!(
  1615 | |     FixedU128,1616 | |     test_fixed_u128,1617 | |     u128,...    |
  1621 | |         [0.000000000000000000,340282366920938463463.374607431768211455]_",1622 | | );
       | |__- in this macro invocation
       |
       = note: this error originates in a macro (in Nightly builds,run with -Z macro-backtrace for more info)

  error: aborting due to 3 previous errors

  For more information about this error,try `rustc --explain E0282`.
  error: could not compile `sp-arithmetic`

这是更广泛的教程的一部分。

我相信铁锈已经更新。

问题似乎是宏sp-aritmetic，但是我不确定如何给它一个“类型”。我的铁锈不存在了...

真的渴望进入Ink！因此我们将不胜感激。

解决方法

该错误的原因是从2020-10-06版本开始的rust night编译器中的regression。您需要rustup toolchain install 2020-10-05并将其用于构建运行时，直到解决此问题为止。通常，最新的每晚会自动用于构建运行时。您可以通过设置WASM_BUILD_TOOLCHAIN环境变量来覆盖此行为。在这种情况下：

export WASM_BUILD_TOOLCHAIN='nightly-2020-10-05'

如果要与货运合同订立合同，则应使用：

cargo +nightly-2020-10-05 contract build