virtual void visit(ProgramSyntax::ExpressionStatement &);
virtual void visit(ProgramSyntax::Import &);
virtual void visit(ProgramSyntax::Layout &);
+ virtual void visit(ProgramSyntax::InterfaceLayout &);
virtual void visit(ProgramSyntax::StructDeclaration &);
virtual void visit(ProgramSyntax::VariableDeclaration &);
virtual void visit(ProgramSyntax::InterfaceBlock &);