Sven Panne
I'm a little bit late to the 8.0.1 show, but nevertheless: Motivated by the current discussion about -Wcompat and friends I decided to take a detailed look at the warnings in my projects and hit a regression(?): Somehow I'm unable to suppress the "Top-level binding with no type signature" warnings from 8.0.1 onwards.
The gory details: In my .cabal file I set -Wall ( https://github.com/haskell-opengl/OpenGLRaw/blob/master/OpenGLRaw.cabal#L618), and in my .travis.yml I set -Werror ( https://github.com/haskell-opengl/OpenGLRaw/blob/master/.travis.yml#L76). But the -Wno-missing-signatures pragma ( https://github.com/haskell-opengl/OpenGLRaw/blob/master/src/Graphics/GL/Toke...) doesn't work, see https://travis-ci.org/haskell-opengl/OpenGLRaw/jobs/109400373. Using -fno-warn-missing-signatures didn't work, either, see https://travis-ci.org/haskell-opengl/OpenGLRaw/jobs/109396738.
Am I doing something wrong here or is this really a regression? I'm quite sure that suppressions via pragmas worked in the past... :-(
The reason for this is that the things missing signatures are pattern synonyms, which have their warnings controlled by -Wmissing-pat-syn-sigs [1], which is enabled in -Wall by default. Cheers, - Ben [1] http://downloads.haskell.org/~ghc/master/users-guide//using-warnings.html#gh...