Correctly parse EVAL response containing customized error (redis#710)

* always parse all content in an array including error

commands_test.go

@@ -10,6 +10,7 @@ import (
 	. "github.com/onsi/gomega"
 
 	"github.com/go-redis/redis"
+	"github.com/go-redis/redis/internal"
 )
 
 var _ = Describe("Commands", func() {
@@ -2993,6 +2994,15 @@ var _ = Describe("Commands", func() {
 			Expect(vals).To(Equal([]interface{}{"key", "hello"}))
 		})
 
+		It("returns all values after an error", func() {
+			vals, err := client.Eval(
+				`return {12, {err="error"}, "abc"}`,
+				nil,
+			).Result()
+			Expect(err).NotTo(HaveOccurred())
+			Expect(vals).To(Equal([]interface{}{int64(12), internal.RedisError("error"), "abc"}))
+		})
+
 	})
 
 })

parser.go

@@ -17,7 +17,7 @@ func sliceParser(rd *proto.Reader, n int64) (interface{}, error) {
 		if err == Nil {
 			vals = append(vals, nil)
 		} else if err != nil {
-			return nil, err
+			vals = append(vals, err)
 		} else {
 			switch vv := v.(type) {
 			case []byte: