Consider this JS code:

for (let i = 0; i < 10; i++) {
    console.log(i);
}

for (let i = 0; i < 10; i++) {  
    console.log(i); 
} 

Here the variable `i` should be scoped to their parent for-loops, but yet Qt Creator gives warnings: `var "i" is used before its declaration` and `"i" is declared more than once`.

Note, that it says `var` despite `let` being used.