Well.. that escalated quickly.

Completely forgot that Traefik uses outdated Yaegi and requires compatibility with 1.20 ( pre-generic Go code ).

error_recovery_test.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"errors"
 	"net"
-	"slices"
 	"testing"
 	"time"
 )
@@ -208,7 +207,7 @@ func TestGracefulDegradation(t *testing.T) {
 	}()
 
 	t.Run("Register fallback and health check", func(t *testing.T) {
-		gd.RegisterFallback("test-service", func() (any, error) {
+		gd.RegisterFallback("test-service", func() (interface{}, error) {
 			return "fallback-result", nil
 		})
 
@@ -223,12 +222,12 @@ func TestGracefulDegradation(t *testing.T) {
 	})
 
 	t.Run("Execute with fallback on failure", func(t *testing.T) {
-		gd.RegisterFallback("failing-service", func() (any, error) {
+		gd.RegisterFallback("failing-service", func() (interface{}, error) {
 			return "fallback-result", nil
 		})
 
 		// First call should fail and mark service as degraded
-		result, err := gd.ExecuteWithFallback("failing-service", func() (any, error) {
+		result, err := gd.ExecuteWithFallback("failing-service", func() (interface{}, error) {
 			return nil, errors.New("service failure")
 		})
 		if err != nil {
@@ -245,7 +244,7 @@ func TestGracefulDegradation(t *testing.T) {
 	})
 
 	t.Run("No fallback available", func(t *testing.T) {
-		_, err := gd.ExecuteWithFallback("no-fallback-service", func() (any, error) {
+		_, err := gd.ExecuteWithFallback("no-fallback-service", func() (interface{}, error) {
 			return nil, errors.New("service failure")
 		})
 
@@ -256,7 +255,13 @@ func TestGracefulDegradation(t *testing.T) {
 
 	t.Run("Get degraded services", func(t *testing.T) {
 		degraded := gd.GetDegradedServices()
-		found := slices.Contains(degraded, "failing-service")
+		found := false
+		for _, s := range degraded {
+			if s == "failing-service" {
+				found = true
+				break
+			}
+		}
 		if !found {
 			t.Error("Expected failing-service to be in degraded list")
 		}