#9804: Layering: Suspicious dependency from Parser to TcEvidence -------------------------------------+------------------------------------- Reporter: rodlogic | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 7.8.3 Resolution: invalid | Keywords: Operating System: | Architecture: Unknown/Multiple Unknown/Multiple | Difficulty: Unknown Type of failure: | Blocked By: None/Unknown | Related Tickets: Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Changes (by simonpj): * status: new => closed * resolution: => invalid Comment: Fair point, but there is a good reason for this. The same `HsSyn` syntax tree is used for * The output of the parser * The output of the renamer * The output of the typechecker The latter, in particular, decorates the tree with information generated by the typechecker; the data types for much of that information is in `TcEvidence`. There are alternatives, of course. Eg have three data types not one; or use more aggressive parameterisation. But the cure seems worse than the disease. By all means suggest improvements, but I'll close this for now as "by design". Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9804#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler