GHC 6.12.1 #95

singpolyma opened this Issue Mar 23, 2013 · 1 comment


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I am working on backporting this library to Debian stable, and am running in to the following:

    Inferred type is less polymorphic than expected
      Quantified type variable `i' escapes
    In the expression: Prelude.mapM_ yield
    In the definition of `sourceList': sourceList = Prelude.mapM_ yield

I sort of know where this error is from, but not why I get it and newer GHC's do not. Was this a known bug with RankNTypes in older GHC?


I'm not really familiar with the changes that would cause this, but I can tell you that I've never even considered using 6.12.1 for conduit.

@snoyberg snoyberg closed this Mar 24, 2013
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