Fix #710 – Calling wrenEnsureSlots before wrenInterpret causes apiStack to become invalid #712
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This PR fixes #710.
I am not sure if this causes memory leaks or not. As far as I know, the fiber should somehow be freed, but I can't tell how. Valgrind does report some problems, but they seem unrelated to this issue.
This does not include any tests, because I have no idea how the test system works. If anyone can explain it to me, I'd be more than happy to create a test for this.