Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
fcd60e73f8
This PR addresses the lean crash (stack overflow) with nested induction and the generation of the `SizeOf` spec lemmas, reported at #9018. It does not address the underlying issue that in these cases, the generated SizeOf code does not match the the SizeOf function found by instance search, and thus the generation fails. This seem hard to fix: `mkSizeOfMinors` would have to recognize that given, say, `List (Id Tree)`, the derived instance (assuming there was one for `Tree`) is not the same as for `List Tree`. The problem seems just about as hard as getting derived SizeOf right in the presence of nested induction and non-canonical SizeOf instances. |
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