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fa78d937dc
fixes #22597
```nim
proc autoToOpenArray*[T](s: Slice[T]): openArray[T] =
echo "here twice"
result = toOpenArray(s.p, s.first, s.last)
```
For functions returning openarray types, `fixupCall` creates a temporary
variable to store the return value: `let tmp = autoToOpenArray()`. But
`genOpenArrayConv` cannot handle openarray assignements with side
effects. It should have stored the right part of the assignment first
instead of calling the right part twice.
(cherry picked from commit d44b0b1869)