Variable declaration reset

A decidely non-challenging task to highlight a potential difference between programming languages.

Using a straightforward longhand loop as in the JavaScript and Phix examples below, show the locations of elements which are identical to the immediately preceding element in {1,2,2,3,4,4,5}. The (non-blank) results may be 2,5 for zero-based or 3,6 if one-based.
The purpose is to determine whether variable declaration (in block scope) resets the contents on every iteration.
If your programming language does not support block scope (eg assembly) it should be omitted from this task.

JavaScript

<head>
 <meta charset="utf-8"/>
 <meta name="viewport" content="width=device-width, initial-scale=1"/>
 <title>variable declaration reset</title>
</head>
<body>
 <script>

"use strict"; let s = [1, 2, 2, 3, 4, 4, 5]; for (let i=0; i<7; i+=1) {

   let curr = s[i], prev;
   if (i>1 && (curr===prev)) {
       console.log(i);
   }
   prev = curr;

}

 </script>
</body>

</html></lang> No output
Manually moving the declaration of prev to before the loop, or changing the third "let" to "var" (causes legacy hoisting and) gives:

Output:

2
5

Phix

with javascript_semantics
sequence s = {1,2,2,3,4,4,5}
for i=1 to length(s) do
    integer curr = s[i], prev
    if i>1 and curr=prev then
        ?i
    end if
    prev = curr
end for

Output:

3
6

Like the first/unchanged JavaScript example, under pwa/p2js there is no output (at least as things currently stand)
Obviously you can achieve consistent results by manually hoisting the declaration of prev to before/outside the loop.