Question

我正在尝试升级Haskell堆栈的副本，如下所示：

public class Test{

private int[] array = new int [5];

  public int method(int i) {
      for(int s = 0; s <= array.length; s++) {
          if( array[s] != null) { //I get the error in here even though the highest upvoted answer in the linked question recommends this solution. I obviously cant check it for 0, because the user input can be 0.
            array[s] = i;
          } else {
             method(i);
        }
      }
   }
}

为什么mac:~ me$ stack --version Version 1.4.0, Git revision e714f1dd3fade19496d91bd6a017e435a96a6bcd (4640 commits) x86_64 hpack-0.17.0 mac:~ me$ stack upgrade Current Stack version: 1.4.0, available download version: 1.7.1 Newer version detected, downloading Querying for archive location for platform: osx-x86_64-static Querying for archive location for platform: osx-x86_64 Downloading from: https://github.com/commercialhaskell/stack/releases/download/v1.7.1/stack-1.7.1-osx-x86_64.tar.gz Download complete, testing executable Version 1.7.1, Git revision 681c800873816c022739ca7ed14755e85a579565 (5807 commits) x86_64 hpack-0.28.2 New stack executable available at /Users/me/.local/bin/stack mac:~ me$ stack --version Version 1.4.0, Git revision e714f1dd3fade19496d91bd6a017e435a96a6bcd (4640 commits) x86_64 hpack-0.17.0 mac:~ me$ which stack /Users/me/.local/bin/stack似乎正确升级了堆栈，声称安装了新版本，然后甚至说stack upgrade，但实际上并没有在测试时升级堆栈版本，New stack executable available at /Users/me/.local/bin/stack命令确认运行的确实是新堆栈可执行文件的位置？

更新：

由于Probie的建议，我检查了which是否报告了更新的版本，并且确实如此：

/Users/me/.local/bin/stack --version

出于这个原因，这使我彻底感到困惑：

mac:~ me$ /Users/me/.local/bin/stack --version
Version 1.7.1, Git revision 681c800873816c022739ca7ed14755e85a579565 (5807 commits) x86_64 hpack-0.28.2

为什么使用mac:~ me$ /Users/me/.local/bin/stack --version Version 1.7.1, Git revision 681c800873816c022739ca7ed14755e85a579565 (5807 commits) x86_64 hpack-0.28.2 mac:~ me$ which stack /Users/me/.local/bin/stack mac:~ me$ stack --version Version 1.4.0, Git revision e714f1dd3fade19496d91bd6a017e435a96a6bcd (4640 commits) x86_64 hpack-0.17.0命令运行的堆栈版本与stack命令显示的位置显示的版本不同？

Answer 1

编辑：

事实证明，就bash而言，which并没有返回正确的结果。 It might be related to this

很可能bash缓存了堆栈的位置，并且没有使用新的堆栈。

尝试运行hash stack，然后重试。（否则，如果hash -r无法清空缓存）

Haskell堆栈不会升级

更新：

1 个答案: