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License: MIT License
yacctt: Yet Another Cartesian Cubical Type Theory
License: MIT License
Hello.
From the implementation I failed to find how eta rule for VType is implemented. It seems to me at least it is essential for some computation rules to be correct.
It seems to me that the conversion checking in yacctt is syntax directed, but lambda term is not domain-free. open variables needs to have it's type because we need to have infer
for path type application rules.
In my implementation https://github.com/molikto/mlang/blob/master/shared/shared/src/main/scala/mlang/core/Unify.scala#L381 I can get type directed eta rules for all types except VType, because VType don't really terminate unfolding in a type directed way.
So what's the best conversion checking for cartisian cubical type theory? It seems both syntax-directed way and type directed way has its slight problems
I saw
Lines 428 to 433 in 72cf547
Is it that you are too lazy to implement the general case, or is it an open problem?
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