#14052: Significant GHCi speed regression with :module and `let` in GHC 8.2.1 -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: osa1 Type: bug | Status: closed Priority: high | Milestone: 8.4.2 Component: GHCi | Version: 8.2.1-rc2 Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: #11547 | Differential Rev(s): Phab:D4478 Wiki Page: | -------------------------------------+------------------------------------- Comment (by osa1): The conclusion was to not keep shadowed variables at all (because there's no reason for it), whether it's fast or slow. So really the fix for #11547 is just a better error message (as mentioned in comment:22). sighingnow, would you be willing to open a new ticket for that and give it a try? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14052#comment:25 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler