functions involving if and case do not throw exceptions anymore; but eqvt_at assumption has now a precondition
quick_and_dirty := true;
no_document use_thys
["Quotient",
"Examples/AbsRepTest",
"Examples/FSet",
"Examples/FSet2",
"Examples/FSet3",
"Examples/IntEx",
"Examples/IntEx2",
"Examples/LFex",
"Examples/LamEx",
"Examples/LarryDatatype",
"Examples/LarryInt",
"Examples/Terms"];