#13480: GHCi display visible type application -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: Iceland_jack Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler | 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: #8751 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by Iceland_jack): TODO See if you can easily generate a dependency tree of type class instances used for an expression. Quite often I delete instances to check which instance they make use of (especially with indirect dependencies). A famous case where this would help is `view _Just Nothing` which has a `Monoid` constraint and the connection is contrived (I haven't considered how this could be visualised): {{{ ghci> :whichInst view _Just Nothing instance Monoid m => Applicative (Const m) ... }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13480#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler