Fix BoxStackInstance error #1309
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…week, this is the case where we have a dominating initialization that nevertheless doesn't write to the variable's register, but a later delay-captured reference does write to the register. Conservatively emitting undef-init now; delay capture needs to be revisited in the wake of the stable closures change.
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Similar issue to the missiung-undef-initialization case I fixed last week, this is the case where we have a dominating initialization that nevertheless doesn't write to the variable's register, but a later delay-captured reference does write to the register. Conservatively emitting undef-init now; delay capture needs to be revisited in the wake of the stable closures change.