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cf5b89f573
fixes #25046
```nim
proc makeiter(v: string): iterator(): string =
return iterator(): string =
yield v
# loops
for c in makeiter("test")():
echo "loops ", c
```
becomes
```nim
var temp = makeiter("test")
for c in temp():
echo "loops ", c
```
for closures that might have side effects
(cherry picked from commit 31d64b57d5)