codegen/smithy-go-codegen/src/main/java/software/amazon/smithy/go/codegen/integration/ValidationGenerator.java [266:295]:
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                                    writer.openBlock("case *$T:", "", memberSymbol, () -> {
                                        String addr = "";
                                        if (!pointableIndex.isPointable(unionMember)
                                                && pointableIndex.isPointable(target)) {
                                            addr = "&";
                                        }
                                        writer.openBlock("if err := $L($Luv.Value); err != nil {", "}", memberHelper,
                                                addr, () -> {
                                                    writer.addUseImports(SmithyGoDependency.SMITHY);
                                                    writer.write("invalidParams.AddNested(\"[$L]\", "
                                                                    + "err.(smithy.InvalidParamsError))",
                                                            unionMember.getMemberName());
                                                });
                                    });
                                }
                            });
                        }
                        break;

                    default:
                        throw new CodegenException("Unexpected validation helper shape type " + shape.getType());
                }

                writer.write("if invalidParams.Len() > 0 {");
                writer.write("return invalidParams");
                writer.write("} else {");
                writer.write("return nil");
                writer.write("}");
            });
            writer.write("");
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codegen/smithy-go-codegen/src/main/java/software/amazon/smithy/go/codegen/server/ServerValidationgenerator.java [217:246]:
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                                    writer.openBlock("case *$T:", "", memberSymbol, () -> {
                                        String addr = "";
                                        if (!pointableIndex.isPointable(unionMember)
                                                && pointableIndex.isPointable(target)) {
                                            addr = "&";
                                        }
                                        writer.openBlock("if err := $L($Luv.Value); err != nil {", "}", memberHelper,
                                                addr, () -> {
                                                    writer.addUseImports(SmithyGoDependency.SMITHY);
                                                    writer.write("invalidParams.AddNested(\"[$L]\", "
                                                                    + "err.(smithy.InvalidParamsError))",
                                                            unionMember.getMemberName());
                                                });
                                    });
                                }
                            });
                        }
                        break;

                    default:
                        throw new CodegenException("Unexpected validation helper shape type " + shape.getType());
                }

                writer.write("if invalidParams.Len() > 0 {");
                writer.write("return invalidParams");
                writer.write("} else {");
                writer.write("return nil");
                writer.write("}");
            });
            writer.write("");
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