来自Pro Git的Git分支示例(Git branching example from Pro Git)

 我正在阅读Pro Git书籍 ，试图让我的头脑在DVCS中进行分支和合并。 到目前为止，这是一个很好的资源，但我在这一节遇到了一些麻烦。 
 
 在图3-8中，我们有以下几点： 
 
 
 testing分支指向c2b9e ，没问题。 
 
 但是，作者检查出master ，提交了一个更改，突然间它的master指向c2b9e ，而不是testing ： 
 
 
 我期待它会导致 
 
HEAD -> master -> some_new_SHA -> f30ab
 
 和 
 
testing -> c2b9e -> f30ab
 
 我有一个“ 编译器有bug ”！ 与此时刻。 在编译器中几乎没有错误（当然，这个错误在我们自己的代码中），所以请帮助我看看我的方式错误。 

I'm going through the Pro Git book, trying to get my head around branching and merging in DVCS. So far it's been a great resource, but I'm having a little trouble with this section.
 
In Figure 3-8, we have the following:
 
 
The testing branch points to c2b9e, fine. 
 
But then the author checks out master, commits a change, and suddenly it's master that's pointing to c2b9e, rather than testing:
 
 
I was expecting it to result in
 
HEAD -> master -> some_new_SHA -> f30ab
 
and
 
testing -> c2b9e -> f30ab
 
I'm having one of those "there's a bug in the compiler!" moments with this. There almost never is a bug in the compiler (the bug's in our own code, of course), so please help me see the error of my ways with this.

原文：https://stackoverflow.com/questions/6865841