Version check that is go1.21 compatible

cmd/goversion_go122.go

@@ -0,0 +1,13 @@
+//go:build go1.22
+// +build go1.22
+
+package cmd
+
+import (
+	goversion "go/version"
+	"runtime"
+)
+
+func isGoVersionAtLeast(v string) bool {
+	return goversion.Compare(runtime.Version(), v) < 0
+}

cmd/goversion_old.go

@@ -0,0 +1,8 @@
+//go:build !go1.22
+// +build !go1.22
+
+package cmd
+
+func isGoVersionAtLeast(_ string) bool {
+	return false
+}

cmd/main_e2e_test.go

@@ -2,7 +2,6 @@ package cmd
 
 import (
 	"bytes"
-	goversion "go/version"
 	"io/ioutil"
 	"os"
 	"path/filepath"
@@ -32,8 +31,8 @@ func TestE2E_RerunFails(t *testing.T) {
 	if testing.Short() {
 		t.Skip("too slow for short run")
 	}
-	if v := runtime.Version(); goversion.Compare(v, "go1.22") < 0 {
-		t.Skipf("version %v no longer supported by this test", v)
+	if !isGoVersionAtLeast("go1.22") {
+		t.Skipf("version %v no longer supported by this test", runtime.Version())
 	}
 	t.Setenv("GITHUB_ACTIONS", "no")