codegen/smithy-go-codegen/src/main/java/software/amazon/smithy/go/codegen/integration/HttpBindingProtocolGenerator.java [1580:1604]:
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    private void generateErrorDeserializer(GenerationContext context, StructureShape shape) {
        GoWriter writer = context.getWriter().get();
        String functionName = ProtocolGenerator.getErrorDeserFunctionName(
                shape, context.getService(), context.getProtocolName());
        Symbol responseType = getApplicationProtocol().getResponseType();

        writer.addUseImports(SmithyGoDependency.BYTES);
        writer.openBlock("func $L(response $P, errorBody *bytes.Reader) error {", "}",
                functionName, responseType, () -> deserializeError(context, shape));
        writer.write("");
    }

    /**
     * Writes a function body that deserializes the given error.
     *
     * <p>Two parameters will be available in scope:
     * <ul>
     *   <li>{@code response: smithyhttp.HTTPResponse}: the HTTP response received.</li>
     *   <li>{@code errorBody: bytes.BytesReader}: the HTTP response body.</li>
     * </ul>
     *
     * @param context The generation context.
     * @param shape   The error shape.
     */
    protected abstract void deserializeError(GenerationContext context, StructureShape shape);
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codegen/smithy-go-codegen/src/main/java/software/amazon/smithy/go/codegen/integration/HttpRpcProtocolGenerator.java [417:441]:
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    private void generateErrorDeserializer(GenerationContext context, StructureShape shape) {
        GoWriter writer = context.getWriter().get();
        String functionName = ProtocolGenerator.getErrorDeserFunctionName(
                shape, context.getService(), context.getProtocolName());
        Symbol responseType = getApplicationProtocol().getResponseType();

        writer.addUseImports(SmithyGoDependency.BYTES);
        writer.openBlock("func $L(response $P, errorBody *bytes.Reader) error {", "}",
                functionName, responseType, () -> deserializeError(context, shape));
        writer.write("");
    }

    /**
     * Writes a function body that deserializes the given error.
     *
     * <p>Two parameters will be available in scope:
     * <ul>
     *   <li>{@code response: smithyhttp.HTTPResponse}: the HTTP response received.</li>
     *   <li>{@code errorBody: bytes.BytesReader}: the HTTP response body.</li>
     * </ul>
     *
     * @param context The generation context.
     * @param shape   The error shape.
     */
    protected abstract void deserializeError(GenerationContext context, StructureShape shape);
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