Function build_stack 

pub fn build_stack<G>(
    git: &G,
    doc: &PlanDocument,
    view: &DiffView,
    opts: &StackOptions<'_>,
) -> Result<StackResult, EngineError>
where
    G: ObjectReader + ObjectWriter + TreeBuilder + CommitWriter + TreeResolver + RecountSource + RefWriter,

Build and land the stack. Errors (and leaves the ref untouched) if any stack invariant fails.