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<commit-ish> parsing does not recognize @ as HEAD

See original GitHub issue

With nbgv 3.4.244+c60a07221c, nbgv get-version @ claims “rev-parse produced no commit for @”, even though git rev-parse @ treats @ as equivalent to HEAD as documented in git-rev-parse(1).

Microsoft Windows [Version 10.0.19044.1415]
(c) Microsoft Corporation. All rights reserved.

C:\Projects>mkdir commit-ish-parsing

C:\Projects>cd commit-ish-parsing

C:\Projects\commit-ish-parsing>git init
Initialized empty Git repository in C:/Projects/commit-ish-parsing/.git/

C:\Projects\commit-ish-parsing>nbgv install

C:\Projects\commit-ish-parsing>git status
starting fsmonitor-daemon in 'C:/Projects/commit-ish-parsing'
On branch master

No commits yet

Changes to be committed:
  (use "git rm --cached <file>..." to unstage)
        new file:   Directory.Build.props
        new file:   version.json


C:\Projects\commit-ish-parsing>git commit -m "nbgv install"
[master (root-commit) 84f4f71] nbgv install
 2 files changed, 22 insertions(+)
 create mode 100644 Directory.Build.props
 create mode 100644 version.json

C:\Projects\commit-ish-parsing>copy nul dummy
        1 file(s) copied.

C:\Projects\commit-ish-parsing>git add dummy

C:\Projects\commit-ish-parsing>git commit -m dummy
[master c4fd226] dummy
 1 file changed, 0 insertions(+), 0 deletions(-)
 create mode 100644 dummy

C:\Projects\commit-ish-parsing>nbgv get-version
Version:                      1.0.2.64964
AssemblyVersion:              1.0.0.0
AssemblyInformationalVersion: 1.0.2-beta+c4fd226c01
NuGetPackageVersion:          1.0.2-beta
NpmPackageVersion:            1.0.2-beta

C:\Projects\commit-ish-parsing>nbgv get-version @
rev-parse produced no commit for @

C:\Projects\commit-ish-parsing>nbgv get-version HEAD
Version:                      1.0.2.64964
AssemblyVersion:              1.0.0.0
AssemblyInformationalVersion: 1.0.2-beta+c4fd226c01
NuGetPackageVersion:          1.0.2-beta
NpmPackageVersion:            1.0.2-beta

C:\Projects\commit-ish-parsing>git rev-parse @
c4fd226c0169d5f05e10030513c60c376ed565ae

C:\Projects\commit-ish-parsing>nbgv --version
3.4.244+c60a07221c

C:\Projects\commit-ish-parsing>