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3cebffe820
Our definition of `toString` for the internal tuple objects we create during the
points-to analysis may have been a _tad_ too ambitious. In particular, it can
easily lead to non-termination, e.g. using the following piece of code:
```python
x = ()
while True:
x = (x, x)
```
This commit cuts off the infinite recursion by replacing _nested_ tuples with
the string "...". In particular this means even non-recursive tuples will be cut
off at that point, so that the following tuples
```python
(1, "2")
((3, 4), [5, 6])
(1, 2, 3, 4, 5)
```
Get the following string representations.
```
"(int 1, '2', )"
"(..., List, )"
"(int 1, int 2, int 3, 2 more...)"
```