[mcoblenz]

I just added a clarification to the README about this. The main issue is that the current implementation keeps track of roots with a shadow stack technique (https://llvm.org/docs/GarbageCollection.html#using-llvm-gcwr...), which is not thread-safe. It wasn't worth the engineering work for this particular study since the tasks didn't require more than one thread. A practical implementation, of course, would need to be thread-safe.

[dahfizz]

I'm sure the GC implementation itself could be made thread safe. But the paper mentions that Bronze lets you have multiple mutable references to an object. Doesn't this open the door to the user's code having data races, whereas it would be safe by default in vanilla Rust?