How do I initialize a set of range?

[tobia]

This code:
    
    
    let somePrimes: set[1..10] = {2, 3, 5, 7}
    
    
    Run

gives:
    
    
    Error: type mismatch: got <set[range 0..65535(int)]> but expected 
'set[range 1..10(int)]'
    
    
    Run

How do I initialize a set of range?