#12895: Lookup rules associated with functions/values in GHCI -------------------------------------+------------------------------------- Reporter: harpocrates | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: GHCi | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by harpocrates): Replying to [comment:1 simonpj]:
I can see the value, and I don't think it'd be hard. Happy to advise.
First look at how `:info` works, I suggest.
Simon
After a quick survey of how `:info` works, I think I'm starting to see what needs to be done (or getting lost). As `:info` does for finding instances, I'll need to start by loading some interfaces to make sure I really do find all my `RULES`, then I should be able to get out of the `ExternalPackageState` a `RuleBase`, at which point I just need to filter for the right `CoreRule`s . However, is `CoreRule` really the abstraction I'm looking for? I noticed there is also an interface level `IfaceRule` and a type checker level `LRuleDecl Id` (from `TcGblEnv`) so I thought I'd ask... More generally, how little of this sounds right? :) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12895#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler