gf-3.1.6: lib/src/api/SymbolicDut.gf
--# -path=.:present:mathematical:prelude resource SymbolicDut = Symbolic with (Symbol = SymbolDut), (Grammar = GrammarDut) ;
--# -path=.:present:mathematical:prelude resource SymbolicDut = Symbolic with (Symbol = SymbolDut), (Grammar = GrammarDut) ;