Tue, 08 Aug 2023 12:35:14 +0200 wenzelm proper prev_thy (amending 92a547feec88), notably for the sake of 'print_theorems', which is the only use of Toplevel.previous_theory_of;
Tue, 08 Aug 2023 15:49:01 +0200 traytel made another two tactics more robust in presence of BNFs nesting live variables (reported by Wolfgang Jeltsch)
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