pulling semiring in module

protolude.cabal

@@ -45,6 +45,7 @@ library
     Show
     Either
     Functor
+    Semiring
     Bifunctor
 
   default-extensions:
@@ -64,7 +65,6 @@ library
     async            >= 2.1  && <2.2,
     deepseq          >= 1.3  && <= 1.5,
     containers       >= 0.5  && <0.6,
-    semiring-simple  >= 0.1  && <1.1,
     mtl              >= 2.1  && <2.3,
     transformers     >= 0.4  && < 0.6,
     text             >= 1.2  && <1.3,

src/Protolude.hs

@@ -80,7 +80,7 @@ import Data.Foldable as X hiding (
     foldr1
   , foldl1
   )
-import Data.Semiring as X
+import Semiring as X
 import Data.Functor.Identity as X
 
 #if ( __GLASGOW_HASKELL__ >= 800 )

src/Semiring.hs

@@ -0,0 +1,19 @@
+{-# LANGUAGE Safe #-}
+{-# LANGUAGE NoImplicitPrelude #-}
+
+module Semiring (
+  Semiring(..),
+  zero,
+) where
+
+import Data.Monoid
+
+-- | Alias for 'mempty'
+zero :: Monoid m => m
+zero = mempty
+
+class Monoid m => Semiring m where
+  {-# MINIMAL one, (<.>) #-}
+
+  one :: m
+  (<.>) :: m -> m -> m

stack.yaml

@@ -1,34 +1,7 @@
-# For more information, see: https://github.com/commercialhaskell/stack/blob/release/doc/yaml_configuration.md
-
-# Specifies the GHC version and set of packages available (e.g., lts-3.5, nightly-2015-09-21, ghc-7.10.2)
 resolver: lts-5.10
-
-# Local packages, usually specified by relative directory name
 packages:
 - '.'
-
-# Packages to be pulled from upstream that are not in the resolver (e.g., acme-missiles-0.3)
 extra-deps:
-- semiring-simple-1.0.0.1
 - string-conv-0.1
-
-# Override default flag values for local packages and extra-deps
 flags: {}
-
-# Extra package databases containing global packages
 extra-package-dbs: []
-
-# Control whether we use the GHC we find on the path
-# system-ghc: true
-
-# Require a specific version of stack, using version ranges
-# require-stack-version: -any # Default
-# require-stack-version: >= 0.1.4.0
-
-# Override the architecture used by stack, especially useful on Windows
-# arch: i386
-# arch: x86_64
-
-# Extra directories used by stack for building
-# extra-include-dirs: [/path/to/dir]
-# extra-lib-dirs: [/path/to/dir]