Stack package:ghc-lib-parser

Representation of StgStack: The 'tsoStack ' of a TSOClosure.
A pointer field
A non-pointer field
The closure is a stack frame
A Stack Slot is either known or unknown. We avoid maybe here for more strictness.
The current thread's stack exceeded its limit. Since an exception has been raised, the thread's stack will certainly be below its limit again, but the programmer should take remedial action immediately.
non-zero => dirty
stack size in *words*