Yuras Shumovich
Hello,
Hello, Sorry for the late reply; this required a bit of reflection. The invariants surrounding the suspension of ST computations is a rather delicate and poorly documented area. I believe the asynchronous exception case which you point out is precisely #13615. The solution there was, as David suggests, ensure that no resulting thunk could be entered more than once by a very strict blackholing protocol. Note that this isn't normal "eager" blackholing protocol, which still might allow multiple entrancy. It's rather a more strict variant, requiring two atomic operations. I can't be certain that there aren't more cases like this, but I suspect not since most asynchronous suspensions where the resulting thunk might "leak" back into the program go through the raiseAsync codepath that was fixed in #13615. Cheers, - ben