Passing -C flag causes the 'impossible' to happen

Passing -C flag to GHC causes compiler panic:

addFlag by -C on the commandline: Warning:
    The -fvia-C flag does nothing; it will be removed in a future GHC release
ghc-stage2: panic! (the 'impossible' happened)
  (GHC version 7.7.20130108 for x86_64-unknown-linux):
        pipeLoop: at phase As but I wanted to stop at phase HCc

Comment in "main/DriverPipeline.hs", lines 665-668 suggests that this behaviour might happen with native code generator. If C codegen is being removed, then -C flag should perhaps be removed as well (also from the documentation)?

Trac metadata

Trac field	Value
Version	7.7
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Driver
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