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stg_dummy_ret info table has type CONSTR_NOCAF but doesn't have a constructor description
`stg_dummy_ret` is defined in `StgMiscClosures.cmm` with the `INFO_TABLE` macro but anything with a constructor type, needs to use `INFO_TABLE_CONSTR` so that there is a constructor description as well. This causes decoding in ghc-debug to fail for this closure.
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