Re: [PATCH v4 11/16] revision.c: --all adds HEAD from all worktrees

> [...]
> diff --git a/revision.c b/revision.c
> index 8d04516266..0e98444857 100644
> --- a/revision.c
> +++ b/revision.c
> @@ -2133,6 +2133,14 @@ static int handle_revision_pseudo_opt(const char *submodule,
>  	int argcount;
>  
>  	if (submodule) {
> +		/*
> +		 * We need some something like get_submodule_worktrees()
> +		 * before we can go through all worktrees of a submodule,
> +		 * .e.g with adding all HEADs from --all, which is not
> +		 * supported right now, so stick to single worktree.
> +		 */
> +		if (!revs->single_worktree)
> +			die("BUG: --single-worktree cannot be used together with submodule");
>  		refs = get_submodule_ref_store(submodule);
>  	} else
>  		refs = get_main_ref_store();