codegen/smithy-go-codegen/src/main/java/software/amazon/smithy/go/codegen/integration/ValidationGenerator.java [188:210]:
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                                    writer.openBlock("if err := $L(v.$L); err != nil {", "}", helperName, memberName,
                                            () -> {
                                                writer.addUseImports(SmithyGoDependency.SMITHY);
                                                writer.write(
                                                        "invalidParams.AddNested($S, err.(smithy.InvalidParamsError))",
                                                        memberName);
                                            });
                                };

                                if (isEnum) {
                                    writer.openBlock("if len(v.$L) > 0 {", "}", memberName, runnable);
                                } else if (pointableIndex.isNillable(memberShape)) {
                                    writer.openBlock("if v.$L != nil {", "}", memberName, runnable);
                                }
                            }
                        });
                        break;

                    case LIST:
                    case SET:
                        CollectionShape collectionShape = CodegenUtils.expectCollectionShape(shape);
                        MemberShape member = collectionShape.getMember();
                        Shape memberTarget = model.expectShape(member.getTarget());
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codegen/smithy-go-codegen/src/main/java/software/amazon/smithy/go/codegen/server/ServerValidationgenerator.java [137:159]:
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                                    writer.openBlock("if err := $L(v.$L); err != nil {", "}", helperName, memberName,
                                            () -> {
                                                writer.addUseImports(SmithyGoDependency.SMITHY);
                                                writer.write(
                                                        "invalidParams.AddNested($S, err.(smithy.InvalidParamsError))",
                                                        memberName);
                                            });
                                };

                                if (isEnum) {
                                    writer.openBlock("if len(v.$L) > 0 {", "}", memberName, runnable);
                                } else if (pointableIndex.isNillable(memberShape)) {
                                    writer.openBlock("if v.$L != nil {", "}", memberName, runnable);
                                }
                            }
                        });
                        break;

                    case LIST:
                    case SET:
                        CollectionShape collectionShape = CodegenUtils.expectCollectionShape(shape);
                        MemberShape member = collectionShape.getMember();
                        Shape memberTarget = model.expectShape(member.getTarget());
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