prog, err := ruleEnv.Program(ast,
		cel.CostLimit(perCallLimit),
		cel.CostTracking(estimator),
		cel.InterruptCheckFrequency(celconfig.CheckFrequency),
	)
	if err != nil {
		compilationResult.Error = &apiservercel.Error{Type: apiservercel.ErrorTypeInvalid, Detail: "program instantiation failed: " + err.Error()}
		return
	}

		// should be impossible since env.Compile returned no issues
		return resultError("unexpected compilation error: "+err.Error(), apiservercel.ErrorTypeInternal)
	}
	prog, err := env.Program(ast,
		cel.InterruptCheckFrequency(celconfig.CheckFrequency),
	)
	if err != nil {
		return resultError("program instantiation failed: "+err.Error(), apiservercel.ErrorTypeInternal)
	}
	return CompilationResult{
		Program:            prog,