Fri, 16 Aug 2019 10:04:47 +0200 wenzelm clarified derivation_name vs. raw_derivation_name;
Thu, 15 Aug 2019 21:46:43 +0200 wenzelm merged
Thu, 15 Aug 2019 21:18:06 +0200 wenzelm more careful treatment of hidden type variable names: smash before zero_var_indexes to get standard enumeration;
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