From 14fe4c4d6b5a29be94ecfc0572e0f9a9a081e795 Mon Sep 17 00:00:00 2001 From: Joey Hess Date: Mon, 30 Apr 2018 09:03:46 -0400 Subject: fix broken SemigroupMonoid transition <> Turns out that with ghc 8.2.2, the instructions given on the page don't work. And the cppless variant that I had compiles, but into effectively mappend = mappend so it loops. The only way I can see to make it work without cpp is to use mappend = (Sem.<>) which is ugly and a land mine waiting to explode if someone changes it to a nicer mappend = (<>) with a newer version of ghc which will compile it and work ok, while breaking it with 8.2.2. Sigh. I posted to haskell-cafe about this. --- src/Propellor/Types/Docker.hs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'src/Propellor/Types/Docker.hs') diff --git a/src/Propellor/Types/Docker.hs b/src/Propellor/Types/Docker.hs index 72703b82..2cd72af2 100644 --- a/src/Propellor/Types/Docker.hs +++ b/src/Propellor/Types/Docker.hs @@ -28,7 +28,7 @@ instance Sem.Semigroup DockerInfo where instance Monoid DockerInfo where mempty = DockerInfo mempty mempty - mappend = (<>) + mappend = (Sem.<>) instance Empty DockerInfo where isEmpty i = and -- cgit v1.2.3