The standard doesn't require compilers find all such cases. The standard allows it, but doesn't require it. There are many known cases where the compiler cannot find a case (at least not in a reasonable amount of time)
The consequence of not being required in the standard is that compilers may not implement it and if they do, they will likely have different implementations/functionality
The consequence of not being required in the standard is that compilers may not implement it and if they do, they will likely have different implementations/functionality