CString is:module

module GHC.CString
ghc-prim
GHC C strings definitions (previously in GHC.Base). Use GHC.Exts from the base package instead of importing this module directly.
module GHC.Hs.DocString
ghc, ghc-lib-parser
An exactprintable structure for docstrings
module GI.GObject.Objects.ParamSpecString
gi-gobject
A ParamSpec derived structure that contains the meta data for string properties.