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Make Thm.SPEC use lazy_beta_conv instead of beta_conv #1301

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Make Thm.SPEC use lazy_beta_conv instead of beta_conv #1301

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Commits on Sep 13, 2024

  1. Make Thm.SPEC use lazy_beta_conv instead of beta_conv 

    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
    @someplaceguy
    someplaceguy committed Sep 13, 2024
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