I wouldn't say the answer is ignoring the assert, if it is then what's
#13142: Substitution invariant failure arising from OptCoercion -------------------------------------+------------------------------------- Reporter: jeiea | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.2 Resolution: | Keywords: Determinism Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: #11371 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): the point of the assert? Correct; but it's a good way to get moving again. In this case, failure of the assertion probably won't lead to anything bad happening. It's not a reason to ignore the bug! -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13142#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler