Variable with a single reference as parameter

A simple reassignment of an array does not work:

Input > arr = [1, 2] [m]
Input > c = arr
Expression type error: None:1:22 --> arr <--
Invalid type in expression

Obviously the variable parameter is parsed as an expression and expression does not allow array types.

The same can be seen for series:

Input > s = (n: 1, 2)
Input > r = s
Expression type error: None:1:35 --> s <--
Invalid type in expression

Actually, any reference is parsed in an expression and it should not.