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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: QArPWFO+3hwaa6HJMqtrpjmX1qPX5M369qVGZ5Z+L1hrGvBJ3PrGAca9PbF/eUik4A+2yAq2zfSFJDsojX5TDxr5c1faChNwwwgsKMnjfct2lIc3U1TD2RaP6RJM4duDWfWVXPTLoiskkYQTiz9hCZx+9otQzokUYaVxJQB/+ULUp6yihzxMntXhofW5CeTnyoYbdHbt/3QWq6dv05gKvrBxKAQkbrFakidQomBYeoNevQ/MTE8HiA/tFCr2qOtDHd+oIJP+jxICHO+YZHHWYKgosFobVZWCm2tuIHoC8rCYw9NWaFq8wKltBvYV+rtWXtI972gEHxtbJgtNAoqTaLOkyXJGATydAswfVm+2PM5V/a6O8wlDSemUFxiShX6HnG1mmEgI3dw9kuxkkx1BDK9Ulra7On1YvFIW7NKr5WND/fQcDUgqtPtG3FtydshK X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 31 Aug 2026 14:23:59.9955 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f9086f8c-d34a-4a5c-a4a6-08df076b8000 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: DU6PEPF0000A7DF.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AMBPR08MB131521 Hi, I ran into this issue a few weeks ago. I'm using Git 2.55.0, which is the latest released. `git help check-ref-format` says this about a branch name: [...] 9. They cannot be the single character @. [...] And as expected, it is rejected: $ git check-ref-format @ && echo BUG! $ However, the following commands all create a branch named @ : $ git checkout -b @ $ git switch -c @ $ git branch @ I believe this to be a bug. Other invalid names are properly rejected though: $ git checkout -b master@{1} fatal: 'master@{1}' is not a valid branch name hint: See 'git help check-ref-format' hint: Disable this message with "git config set advice.refSyntax false" $ git checkout -b @{1} fatal: '@{1}' is not a valid branch name hint: See 'git help check-ref-format' hint: Disable this message with "git config set advice.refSyntax false" $ git checkout -b @^ fatal: '@^' is not a valid branch name hint: See 'git help check-ref-format' hint: Disable this message with "git config set advice.refSyntax false" After creation, this branch cannot be checked out again, as `git checkout @` is a no-op. Luckily though, `git branch -d @` works, so I didn't permanently damage my Git repo :P Bence P.S. as I was typing this mail, I realized that I should've given `--branch` to check-ref-format, and sure enough, there's the problem: $ git check-ref-format --branch @ @ $ git check-ref-format --branch @{1} fatal: '@{1}' is not a valid branch name $ Not sure why it thinks that would be a valid branch name... IMPORTANT NOTICE: The contents of this email and any attachments are confid= ential and may also be privileged. If you are not the intended recipient, p= lease notify the sender immediately and do not disclose the contents to any= other person, use it for any purpose, or store or copy the information in = any medium. Thank you.