New issue 2838: {*iterator} does not behave like set(iterator).
https://bitbucket.org/pypy/pypy/issues/2838/iterator-does-not-behave-like-set-iterator
dudu bs:
When I convert iterator to set using the expression {*x} exceptions that are
thrown away by 'x' disappear as opposed to using expression set(x)
```
#!python
def gen():
yield 1
raise TypeError()
test1 = {*gen()} # not raised
test2 = set(gen()) # raised
```
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