From: Tim Hockin <thockin@google.com>
Date: Sat, 20 Aug 2022 22:39:54 GMT
Subject: rev-parse: -- is sometimes a flag and sometimes an arg?
Message-ID: <CAO_RewbD+BJd1hPKCmCNM8wYBSUmZ2TuOoy6t1up1CT-rbn4DA@mail.gmail.com>

```
$ git rev-parse unknown-tag
unknown-tag
fatal: ambiguous argument 'unknown-tag': unknown revision or path not
in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'
```

OK

```
$ git rev-parse unknown-tag --
fatal: bad revision 'unknown-tag'
```

Much nicer error.  But:

```
$ git rev-parse HEAD --
113a928239196d0d9f70671517ce917071ceecf6
--
```

That's not very nice.  Why is "--" treated as an arg?

```
$ git rev-parse HEAD
113a928239196d0d9f70671517ce917071ceecf6
```

Looking at rev-parse code it SEEMS to be intentional, but I can't
comprehend why.

Tim