UnsupportedClosure and CacheMiss errors running sample code

Richard Warfield
2023-12-13T09:37:27Z

Hello - I'm trying to run the [Count.hs](https://gitlab.haskell.org/ghc/ghc-debug/-/blob/master/client/src/GHC/Debug/Count.hs) example script on a snapshot, and am running into the following errors:

```
Populating block cache with 174666 blocks
"Warning!!: block decoding failed, report this as a bug:(0x422dc5a7c8,DCS {extraDCS = Size {getSize = 24}, unDCS = UnsupportedClosure {info = StgInfoTableWithPtr {tableId = 0x7025cf0, decodedTable = StgInfoTable {entry = Nothing, ptrs = 2, nptrs = 0, tipe = PRIM, srtlen = 0, code = Nothing}}}})"
"Warning!!: block decoding failed, report this as a bug:(0x4200063a18,DCS {extraDCS = Size {getSize = 24}, unDCS = UnsupportedClosure {info = StgInfoTableWithPtr {tableId = 0x7025cf0, decodedTable = StgInfoTable {entry = Nothing, ptrs = 2, nptrs = 0, tipe = PRIM, srtlen = 0, code = Nothing}}}})"
"Warning!!: block decoding failed, report this as a bug:(0x42000639f8,DCS {extraDCS = Size {getSize = 16}, unDCS = ConstrClosure {info = StgInfoTableWithPtr {tableId = 0x39b5280, decodedTable = StgInfoTable {entry = Nothing, ptrs = 1, nptrs = 0, tipe = CONSTR_1_0, srtlen = 0, code = Nothing}}, ptrArgs = [0x42000639e8], dataArgs = [], constrDesc = 0x39b5280}})"
(lots more lines like that...)
"Warning!!: block decoding failed, report this as a bug:(0x42000633c0,DCS {extraDCS = Size {getSize = 32}, unDCS = ConstrClosure {info = StgInfoTableWithPtr {tableId = 0x6f39638, decodedTable = StgInfoTable {entry = Nothing, ptrs = 2, nptrs = 1, tipe = CONSTR, srtlen = 1, code = Nothing}}, ptrArgs = [0xe7213d8,0xe6c7bb0], dataArgs = [210], constrDesc = 0x6f39638}})"
cabal-script-Count.hs: Cache Miss:RequestBlock 0x4211ad2b00
CallStack (from HasCallStack):
error, called at src/GHC/Debug/Client/Monad/Simple.hs:177:20 in ghc-debug-client-0.5.0.0-8ibPHTIGQPzCROI8BvbH7y:GHC.Debug.Client.Monad.Simple
```

Actually I run into pretty much the same thing with any of the sample programs.