Generic "slices" Functions not working - prevents use of OTEL in Traefik middleware

[markdingram]

The following program sample.go triggers an unexpected result

package main

import (
	"fmt"
	"slices"
)

func main() {
	s := []string{"Bat", "Fox", "Owl", "Fox"}
	slices.Sort(s)
	fmt.Println(s)
}

// Output:
// [Bat Fox Fox Owl]

Expected result

$ go run _test/slices.go
[Bat Fox Fox Owl]

Got

$ yaegi _test/slices.go 
run: 16:19: undefined selector: slices.Sort

# After editing stdlib/generic/go1_22_generic.go 

$ yaegi _test/slices.go 
run: 16:19: undefined type for E

Go version

1.22.12

Yaegi Version

d93266d

Additional Notes

First seen while trying to use OTEL from inside a Traefik middleware:

2025-08-11T21:32:24Z ERR Command error error="command traefik error: plugin: failed to create plugin builder: failed to create Yaegi interpreter: failed to import plugin code \"trace-middleware\": 1:21: import \"trace-middleware\" error: plugins-local/src/trace-middleware/trace.go:7:2: import \"go.opentelemetry.io/otel/trace\" error: plugins-local/src/trace-middleware/vendor/go.opentelemetry.io/otel/trace/config.go:9:2: import \"go.opentelelemetry.io/otel/attribute\" error: plugins-local/src/trace-middleware/vendor/go.opentelemetry.io/otel/attribute/set.go:212:2: undefined selector: slices.SortStableFunc"

Failing test added to markdingram@0731b81