* A Capability holds all the state an OS thread/task needs to run
* Haskell code: its STG registers, a pointer to its TSO, a nursery
* etc. During STG execution, a pointer to the Capabilitity is kept in
* A Capability holds all the state an OS thread/task needs to run
* Haskell code: its STG registers, a pointer to its TSO, a nursery
* etc. During STG execution, a pointer to the Capabilitity is kept in