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Without a "--detach" option, git worktree will refuse to checkout a branch that's already checked out. This makes the abi_check.py script not very useful for checking the currently checked out branch, as git will error that the branch is already checked out. Add the "--detach" option to check out the new temporary worktree in detached head mode. This is acceptable because we aren't planning on working on the branch and just want a checkout to do ABI checking from.