askql: for...of doesn't seem to execute the body

Executing the following program:

ask {
    let mySum:float = 0
    for(let price of itemPrices) {
        mySum = mySum:plus(price)
    }
    mySum
}

should lead to an error as itemPrices does not exist and is not defined as resource or value either. Instead, this program return 0.

About this issue

Following our chat, this is how it should work for a string:

const word = 'Hello';
for(const letter of word) {
 log(letter);
}