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in https://leanprover-community.github.io/lean4-metaprogramming-book/main/04_metam.html#backtracking , > `Lean.commitIfNoEx (x : α) : m α` executes `x`. If `x` succeeds, `commitIfNoEx` returns its result. If `x` throws an exception, `commitIfNoEx` backtracks the state and...