Opaque block fresh soundness #6066
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Fixed #6060
What was changed?
Always introduce a new heap variable after an opaque block. I think if no reference 'escapes' the opaque block, then the new heap variable is not needed, and it would be better not to create it, but I couldn't find the machinery to check for the escaping.
How has this been tested?
Added a test for the soundness bug
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