#16261: [] interpreted as an overloaded list in rule LHS -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.10.1 Component: Compiler | Version: 8.6.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect | Unknown/Multiple error/warning at compile-time | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj):
Do you agree with my opinion that OverloadedLists should never be enabled in a rule LHS, regardless of which extensions are enabled in the module?
No: I think the same extensions should be in scope everywhere otherwise people will say "but I wrote `f []` and it didn't match a rule whose LHS was `f []`". However I do agree that it's bizarre that `OverloadedLists` seems to be enabled on the rule LHS but not in the rest of the module. Deeply strange. We just need to understand more about what is happening. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16261#comment:12 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler