New versions of time and Cabal are causing a Core Lint error on Windows

Commit c8d995db in ghc bumped the time submodule to the latest version 4eb06c0e (time-1.8). But it caused a Core Lint error while compiling Distribution.Compat.Time, in the Cabal library:

*** Core Lint errors : in result of Float out(FOS {Lam = Just 0,
                                                   Consts = True,
                                                   OverSatApps = True}) ***
<no location info>: warning:
    In the expression: $wsystemToUTCTime
                         (case lvl_sdDL of v_B1 { I# v_B2 -> v_B2 })
                         (case lvl_sdDM of v_B1 { W# v_B2 -> v_B2 })
    This argument does not satisfy the let/app invariant:
      case lvl_sdDL of v_B1 { I# v_B2 -> v_B2 }

See https://phabricator.haskell.org/harbormaster/build/21371/ for the full build log.

For now the submodule bumps have been reverted.

Trac metadata

Trac field	Value
Version	8.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	highest
Resolution	Unresolved
Component	Compiler
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