Fixed nil lastErr "%!w()" (#1956)

Author: asmyasnikov

internal/pool/pool.go

@@ -2,6 +2,7 @@ package pool
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"sync"
 	"time"
@@ -876,12 +877,17 @@ func (p *Pool[PT, T]) getItem(ctx context.Context) (item PT, finalErr error) { /
 	p.mu.RLock()
 	defer p.mu.RUnlock()
 
-	return nil, xerrors.WithStackTrace(
-		fmt.Errorf("failed to get item from pool after %d attempts and %v, pool has %d items (%d busy, "+
-			"%d idle, %d create_in_progress): %w", attempt, p.config.clock.Since(start), len(p.index),
-			len(p.index)-p.idle.Len(), p.idle.Len(), p.createInProgress, lastErr,
-		),
+	errMsg := fmt.Sprintf(
+		"failed to get item from pool after %d attempts and %v, pool has %d items (%d busy, %d idle, %d create_in_progress)", //nolint:lll
+		attempt, p.config.clock.Since(start), len(p.index),
+		len(p.index)-p.idle.Len(), p.idle.Len(), p.createInProgress,
 	)
+
+	if lastErr != nil {
+		return nil, xerrors.WithStackTrace(fmt.Errorf(errMsg+": %w", lastErr))
+	}
+
+	return nil, xerrors.WithStackTrace(errors.New(errMsg))
 }
 
 //nolint:funlen