slightly more standard data merge: Symtax.merge (K true) avoids equality on abstract type Pretty.T and gracefully accepts overriding, Symtab.join prefers first entry as usual;
(* Title: Admin/Benchmarks/HOL-datatype/ROOT.ML
Some rather large datatype examples (from John Harrison).
*)
val tests = ["Brackin", "Instructions", "SML", "Verilog"];
Unsynchronized.set timing;
warning "\nset quick_and_dirty\n"; Unsynchronized.set quick_and_dirty;
List.app time_use_thy tests;
warning "\nreset quick_and_dirty\n"; Unsynchronized.reset quick_and_dirty;
List.app ThyInfo.remove_thy tests;
List.app time_use_thy tests;