#4959: Warning about variables with leading underscore that are used anyway -------------------------------------+------------------------------------- Reporter: Lemming | Owner: Type: feature request | Status: new Priority: low | Milestone: 7.10.1 Component: Compiler | Version: 7.0.1 (Parser) | Keywords: warning unused Resolution: | underscore variable Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------- Comment (by goldfire): I don't have too strong an opinion here, but I want to note that sometimes the use of a variable with a leading underscore is intentional. In particular, I have found this necessary when I use CPP to optionally disable a certain chunk. I don't want warnings to appear when I disable the chunk (eliminating the one use of a variable, to which I prepend a `_`) or when I enable the chunk (now using a variable with a leading underscore). So, I have a slight preference for "no change" here, but it really is a slight preference -- I do see and understand the original poster's point. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/4959#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler