#5267: Missing type checks for arrow command combinators ------------------------------------------------+-------------------------- Reporter: peteg | Owner: ross Type: bug | Status: new Priority: low | Milestone: 7.10.1 Component: Compiler (Type checker) | Version: 7.0.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: GHC accepts invalid program | Unknown/Multiple Test Case: | Difficulty: Blocking: | Blocked By: | Related Tickets: ------------------------------------------------+-------------------------- Comment (by Simon Peyton Jones ): In [changeset:"f50d62bb6c0357991fabf938bc971d528bbf5cc4/ghc"]: {{{ #!CommitTicketReference repository="ghc" revision="f50d62bb6c0357991fabf938bc971d528bbf5cc4" Fix the scope-nesting for arrows Previously we were capturing the *entire environment* when moving under a 'proc', for the newArrowScope/escapeArrowScope thing. But that a blunderbuss, and in any case isn't right (the untouchable-type-varaible invariant gets invalidated). So I fixed it to be much more refined: just the LocalRdrEnv and constraints are captured. I think this is right; but if not we should just add more fields to ArrowCtxt, not return to the blunderbuss. This patch fixes the ASSERT failure in Trac #5267 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/5267#comment:22 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler