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Austin Seipp authored
This patch implements a warning when definitions conflict with the Applicative-Monad Proposal (AMP), described in #8004. Namely, this will cause a warning iff: * You have an instance of Monad, but not Applicative * You have an instance of MonadPlus, but not Alternative * You locally defined a function named join, <*>, or pure. In GHC 7.10, these warnings will actually be enforced with superclass constraints through changes in base, so programs will fail to compile then. This warning is enabled by default. Unfortunately, not all of our upstream libraries have accepted the appropriate patches. So we temporarily fix ./validate by ignoring the AMP warning. Dan Rosén made an initial implementation of this change, and the remaining work was finished off by David Luposchainsky. I finally made some minor refactorings. Authored-by: Dan Rosén <danr@chalmers.se> Authored-by: David Luposchainsky <dluposchainsky@gmail.com> Signed-off-by: Austin Seipp <austin@well-typed.com>
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