[perl #66280] [BUG] Ranges appear to modify readonly lexicals in pointy nested for loops

[Patrick R. Michaud via RT]

Now fixed in 9e2b9ad:

    $ cat 66280
    for 1,3 -> $i { 
        for $i..4 -> $j { say "$j,$i" }; 
        $i.say;
    }
    $ ./perl6 66280
    1,1
    2,1
    3,1
    4,1
    1
    3,3
    4,3
    3
    $ 

Test added to range.t.  Closing ticket, thanks!

Pm