Core lint error while compiling GHC.IO.Handle

While compiling GHC.IO.Handle with -g3 -dcore-lint -O I encountered the following,

*** Core Lint errors : in result of Simplifier ***
<no location info>: warning:
    [RHS of w1_s8qY :: Addr#]
    Recursive or top-level binder has strict demand info: w1_s8qY
    Binder's demand info: <L,U>

The binding in question is,

w1_s8qY :: Addr#
[LclId,
 Unf=Unf{Src=<vanilla>, TopLvl=False, Value=True, ConLike=True,
         WorkFree=True, Expandable=True, Guidance=IF_ARGS [] 20 0}]
w1_s8qY
  = src<libraries/base/GHC/IO/Handle.hs:745:37-50>
    src<libraries/base/GHC/IO/Handle.hs:739:9-10> "}"#

Trac metadata

Trac field	Value
Version	8.2.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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