codegen/smithy-go-codegen/src/main/java/software/amazon/smithy/go/codegen/integration/ValidationGenerator.java [144:186]:
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            Symbol shapeSymbol = symbolProvider.toSymbol(shape);
            writer.openBlock("func $L(v $P) error {", "}", functionName, shapeSymbol, () -> {
                writer.addUseImports(SmithyGoDependency.SMITHY);

                if (pointableIndex.isNillable(shape)) {
                    writer.openBlock("if v == nil {", "}", () -> writer.write("return nil"));
                }

                writer.write("invalidParams := smithy.InvalidParamsError{Context: $S}", shapeSymbol.getName());
                switch (shape.getType()) {
                    case STRUCTURE:
                        shape.members().forEach(memberShape -> {
                            if (StreamingTrait.isEventStream(model, memberShape)) {
                                return;
                            }

                            String memberName = symbolProvider.toMemberName(memberShape);
                            Shape targetShape = model.expectShape(memberShape.getTarget());
                            boolean required = GoValidationIndex.isRequiredParameter(model, memberShape, topLevelShape);
                            boolean hasHelper = shapesWithHelpers.contains(targetShape.getId());
                            boolean isEnum = targetShape.getTrait(EnumTrait.class).isPresent();

                            if (required) {
                                Runnable runnable = () -> {
                                    writer.write("invalidParams.Add(smithy.NewErrParamRequired($S))", memberName);
                                    if (hasHelper) {
                                        writer.writeInline("} else ");
                                    } else {
                                        writer.write("}");
                                    }
                                };

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

                            if (hasHelper) {
                                Runnable runnable = () -> {
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codegen/smithy-go-codegen/src/main/java/software/amazon/smithy/go/codegen/server/ServerValidationgenerator.java [93:135]:
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            Symbol shapeSymbol = symbolProvider.toSymbol(shape);
            writer.openBlock("func $L(v $P) error {", "}", functionName, shapeSymbol, () -> {
                writer.addUseImports(SmithyGoDependency.SMITHY);

                if (pointableIndex.isNillable(shape)) {
                    writer.openBlock("if v == nil {", "}", () -> writer.write("return nil"));
                }

                writer.write("invalidParams := smithy.InvalidParamsError{Context: $S}", shapeSymbol.getName());
                switch (shape.getType()) {
                    case STRUCTURE:
                        shape.members().forEach(memberShape -> {
                            if (StreamingTrait.isEventStream(model, memberShape)) {
                                return;
                            }

                            String memberName = symbolProvider.toMemberName(memberShape);
                            Shape targetShape = model.expectShape(memberShape.getTarget());
                            boolean required = GoValidationIndex.isRequiredParameter(model, memberShape, topLevelShape);
                            boolean hasHelper = shapesWithHelpers.contains(targetShape.getId());
                            boolean isEnum = targetShape.getTrait(EnumTrait.class).isPresent();

                            if (required) {
                                Runnable runnable = () -> {
                                    writer.write("invalidParams.Add(smithy.NewErrParamRequired($S))", memberName);
                                    if (hasHelper) {
                                        writer.writeInline("} else ");
                                    } else {
                                        writer.write("}");
                                    }
                                };

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

                            if (hasHelper) {
                                Runnable runnable = () -> {
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