[Haskell-cafe] Simple question about blackholing

Hello, By all accounts I've found a thunk is blackholed by replacing its header with a (the) blackhole code pointer (or blackhole info pointer in the unregisterized case). My simple-minded question is how garbage collection can take place given that the layout of the payload is lost. Surely not a custom blackhole for each (statically defined) thunk? A list of blackholes maintained somewhere that the GC knows about? Thanks for any insight! Kei -- Kei Davis Applied Computer Science Group CCS-7, Mail Stop B287 Los Alamos National Laboratory Los Alamos, NM 87545, U.S.A.