#13646: strict patterns with no bindings (e.g. `let !() = ...`) trigger -Wunused- pattern-binds -------------------------------------+------------------------------------- Reporter: exphp | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.2 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 dfeuer): No objection here. I think exphp's point about the assertion with a missing function is quite interesting in itself. Simon, do you think it would be possible to implement a warning when someone applies a bang pattern, `seq`, or `seq#` to something known to have a function type? That seems almost always the wrong thing. It's also bad to force something that will take a dictionary argument, but that seems potentially harder to detect conservatively. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13646#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler