[interpreter] Descriptor type validation #66
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| let DescT (ut1, ut2, ct) = dt in | ||
| let DescT (ut1', ut2', ct') = dt' in | ||
| match ut1, ut1' with | ||
| | (Some ut1, Some ut1') -> |
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@rossberg, I'm trying to validate that if dt <: dt', then we also have ut1 <: ut1', where ut1 and ut1' are the types described by dt and dt'.
I have this working in some cases, but it's super ugly and it breaks in other cases. Specifically, the idx_of_typeuse ut on line 178 fails when the four types are all in the same rec group because in that case it is a Rec rather than an idx.
Do you have a suggestion about how to do these checks more generally and cleanly?
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Oh yes, defining that isn't going to be straightforward, due to all the mutual recursion going on. I'll probably have to think about it. Unfortunately, I just arrived at ICFP/OOPSLA today, so might lack the quiet moment this week and the next. But yeah, assuming you can extract indices is not going to work.
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