Blue berries

Looks delicious but are they eatable? 
They look like:
Vaccinium floribundum ( Andean Blueberry). This blueberry is densely spreading evergreen shrub with small, rounded, glossy dark green leaves, which are purple-red when young. Dense clusters of mid pink flowers appear in May, followed by edible, red berries.
But I don't know. 
Is it perhaps ordinary elderberry.
Who knows.