Type Alias GitBranchPushFn 

pub type GitBranchPushFn = fn(gitdir: &Path, remote: &str, branch: &str, mem: &str, force: bool) -> Result<PushOutcome, BackendError>;

Engine::push dispatch for git-branch mounts. branch is the mount’s declared branch (see GitBranchPullFn); mem labels the outcome only.