Wed, 16 Apr 1997 18:25:46 +0200 moved classes / sorts to sorts.ML;
wenzelm [Wed, 16 Apr 1997 18:25:46 +0200] rev 2964
moved classes / sorts to sorts.ML; moved (and reimplemented) type inference to type_infer.ML; cleaned up type unification; misc cleanup and tuning;
Wed, 16 Apr 1997 18:23:25 +0200 renamed subclass to classrel;
wenzelm [Wed, 16 Apr 1997 18:23:25 +0200] rev 2963
renamed subclass to classrel; tune type checking error msgs;
Wed, 16 Apr 1997 18:22:10 +0200 Sorts.str_of_sort;
wenzelm [Wed, 16 Apr 1997 18:22:10 +0200] rev 2962
Sorts.str_of_sort;
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