GHC Handbook

Note [ghcPrimIds (aka pseudoops)]

GHC/Types/Id/Make.hs:128 compiler 

The ghcPrimIds

  * Are exported from GHC.Prim (see ghcPrimExports, used in ghcPrimInterface)
    See Note [GHC.Prim] in primops.txt.pp for the remaining items in GHC.Prim.

  * Can't be defined in Haskell, and hence no Haskell binding site,
    but have perfectly reasonable unfoldings in Core

  * Either have a CompulsoryUnfolding (hence always inlined), or
        of an EvaldUnfolding and void representation (e.g. realWorldPrimId)

  * Are (or should be) defined in primops.txt.pp as 'pseudoop'
    Reason: that's how we generate documentation for them

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