Disable ghc-pkg accepting multiple package IDs (differing package keys) for now.
Duncan requested that ghc-pkg not accept duplicate package IDs (foo-0.1) by default until the higher level tools can accommodate it. Until then you'll need to use the --multi-instance flag to install multiple copies in the package database. I think reusing the --multi-instance flag is dodgy, because that can be used to cause duplicate package keys; but there is a mode of use of the database where package keys are unique. Signed-off-by: Edward Z. Yang <email@example.com>
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