IronPython.Compiler.Ast.YieldExpression.Reduce C# (CSharp) Метод

        public override MSAst.Expression Reduce() {
            // (yield z) becomes:
            // .comma (1) {
            //    .void ( .yield_statement (_expression) ),
            //    $gen.CheckThrowable() // <-- has return result from send            
            //  }

            return Ast.Block(
                AstUtils.YieldReturn(
                    GeneratorLabel,
                    AstUtils.Convert(_expression, typeof(object))
                ),
                CreateCheckThrowExpression(Span) // emits ($gen.CheckThrowable())
            );
        }