in #4154 and #5129 the rules for equational lemmas have changed, and new options were introduced that can be used to revert to the pre-4.12 behavior. Hopefully nobody really needs these options besides for backwards compatibility, therefore we put these options in the `backward` option name space. So the previous behavior can be achieved by setting ```lean set_option backward.eqns.nonrecursive false set_option backward.eqns.deepRecursiveSplit false ``` |
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