fix: restore go compatibility for runtime models

internal/runtime/module_test.go

@@ -0,0 +1,45 @@
+package runtime
+
+import (
+	"os"
+	"path/filepath"
+	"runtime"
+	"testing"
+)
+
+func TestModuleKeepsGo122Compatibility(t *testing.T) {
+	if runtime.Version() == "" {
+		t.Fatal("runtime version unavailable")
+	}
+	data, err := os.ReadFile(filepath.Join("..", "..", "go.mod"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !containsLine(string(data), "go 1.22") {
+		t.Fatalf("go.mod must keep Go 1.22 compatibility, got:\n%s", data)
+	}
+}
+
+func containsLine(input string, want string) bool {
+	for _, line := range splitLines(input) {
+		if line == want {
+			return true
+		}
+	}
+	return false
+}
+
+func splitLines(input string) []string {
+	var lines []string
+	start := 0
+	for i, char := range input {
+		if char == '\n' {
+			lines = append(lines, input[start:i])
+			start = i + 1
+		}
+	}
+	if start <= len(input) {
+		lines = append(lines, input[start:])
+	}
+	return lines
+}