removing the constant and opting for duplicating the string

graphql.go

@@ -42,8 +42,6 @@ import (
 	"github.com/pkg/errors"
 )
 
-const errorNon200Template = "graphql: server returned a non-200 status code: %v"
-
 // Client is a client for interacting with a GraphQL API.
 type Client struct {
 	endpoint         string
@@ -137,7 +135,7 @@ func (c *Client) runWithJSON(ctx context.Context, req *Request, resp interface{}
 	c.logf("<< %s", buf.String())
 	if err := json.NewDecoder(&buf).Decode(&gr); err != nil {
 		if res.StatusCode != http.StatusOK {
-			return fmt.Errorf(errorNon200Template, res.StatusCode)
+			return fmt.Errorf("graphql: server returned a non-200 status code: %v", res.StatusCode)
 		}
 		return errors.Wrap(err, "decoding response")
 	}
@@ -207,7 +205,7 @@ func (c *Client) runWithPostFields(ctx context.Context, req *Request, resp inter
 	c.logf("<< %s", buf.String())
 	if err := json.NewDecoder(&buf).Decode(&gr); err != nil {
 		if res.StatusCode != http.StatusOK {
-			return fmt.Errorf(errorNon200Template, res.StatusCode)
+			return fmt.Errorf("graphql: server returned a non-200 status code: %v", res.StatusCode)
 		}
 		return errors.Wrap(err, "decoding response")
 	}