#13277: When type classes are redefined in GHCi bindings that use old instances are still accessible -------------------------------------+------------------------------------- Reporter: deech | Owner: (none) Type: bug | Status: closed Priority: normal | Milestone: Component: GHCi | Version: 8.0.1 Resolution: invalid | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Other | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by simonpj): * status: new => closed * resolution: => invalid Comment: No, this is by design. Consiider {{{ Prelude> let x = 3 Prelude> let y = x+4 Preluce> (\x -> y) 72 8 Prelude> let x = "hello" Prelude> y 8 }}} The value of `y` is `x+4` where `x`'s value comes from the binding site of `y`. The fact that `x` now has a totally different value (72, or "hello" in the two examples) is irrelevant. Same with `f` above. Its value is 1 regardless of what other bindings you bring into scope subsequently. Does that make sense? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13277#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler