I've just tried adding swift package SGLMath to an Xcode 13 project without adding any code. When I build the project, it produces the compiler's segmentation faults coming from 15 SGLMath's .swift files. I looked at the build log and the compiler seems to have a problem with the use of * operator during type-checking as the operator is used in every instance of the errors.
Currently, I don't have much idea about why it breaks exactly and am looking forward to hints and fixes. I'll come back if I find anything relevant.