#15809: Use level numbers for generalisation -------------------------------------+------------------------------------- Reporter: simonpj | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.6.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- GHC's type inference engine goes to quite a bit of effort to pin a ''level number'' on every type variable (both skolems and unification variables). '''Idea''': when generalising a type or kind, use those level numbers to decide which variables to generalise. This could completely replace the "global tyvars" field of the `TcLclEnv` (the `tcl_tyvars` field), which is very tiresome to maintain. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15809 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler