Make Thm.SPEC use lazy_beta_conv instead of beta_conv #1301
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The former, unlike the latter, avoids traversing the entire term, which can take exponentially long in certain degenerate conditions observed while replaying certain Z3 proof certificates. Unfortunately, this only fixes the issue for the standard kernel. The experimental kernel does not seem to be amenable to such a straightforward fix, as it does not seem to support closures in the underlying term representation. Partially fixes HOL-Theorem-Prover#1300
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The former, unlike the latter, avoids traversing the entire term, which can take exponentially long in certain degenerate conditions observed while replaying certain Z3 proof certificates.
Unfortunately, this only fixes the issue for the standard kernel. The experimental kernel does not seem to be amenable to such a straightforward fix, as it does not seem to support closures in the underlying term representation.
Partially fixes #1300
Note: I'm not completely certain that it is safe to perform this change, as I do not have a complete understanding of the HOL kernel design or implementation.
Also, I've only done minimal testing by performing a standard build and observing that it completes successfully. I'd be happy to perform more extensive testing if you could provide pointers as to how to perform such testing.
Thanks!