Why cannot do var x,y,z = 0 in Intellij worksheet?

This is ok in .scala file:

var x, y, z = 0

but not in WorkSheet?

Error:(1, 6) constructor cannot be instantiated to expected type;
 found   : (T1, T2)
 required: Int
var (x,y) = { 0;};}
    ^

Also enabling ShowLine Numbers in WorkSheet only temporarily makes line 
numbers appear. As soon
as clicking anywhere in WorkSheet area line numbers disappear again?

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