ghc-lib-0.20190402: The GHC API, decoupled from GHC versions

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TcTyDecls

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type RolesInfo = Name -> [Role] Source #

checkSynCycles :: UnitId -> [TyCon] -> [LTyClDecl GhcRn] -> TcM () Source #

Checks if any of the passed in TyCons have cycles. Takes the UnitId of the home package (as we can avoid checking those TyCons: cycles never go through foreign packages) and the corresponding LTyClDecl Name for each TyCon, so we can give better error messages.

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