Function resolve_maybe_upvar 

fn resolve_maybe_upvar<'db>(
    db: &'db dyn HirDatabase,
    resolver: &mut Resolver<'db>,
    owner: ExpressionStoreOwnerId,
    body: &ExpressionStore,
    current_closure: ExprId,
    expr: ExprId,
    id: ExprOrPatId,
    upvars: &mut FxHashSet<BindingId>,
    path: &Path,
)