Add Data.String, containing IsString(fromString); trac proposal #1126

[ghc-base.git] / Data / String.hs

diff --git a/Data/String.hs b/Data/String.hs
new file mode 100644 (file)
index 0000000..f1a65cd
--- /dev/null
+++ b/Data/String.hs
@@ -0,0 +1,31 @@
+{-# OPTIONS_GHC -fno-implicit-prelude #-}
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Data.String
+-- Copyright   :  (c) The University of Glasgow 2007
+-- License     :  BSD-style (see the file libraries/base/LICENSE)
+--
+-- Maintainer  :  libraries@haskell.org
+-- Stability   :  experimental
+-- Portability :  portable
+--
+-- Things related to the String type.
+--
+-----------------------------------------------------------------------------
+
+module Data.String (
+   IsString(..)
+ ) where
+
+#ifdef __GLASGOW_HASKELL__
+import GHC.Base
+#endif
+
+-- | Class for string-like datastructures; used by the overloaded string
+--   extension (-foverloaded-strings in GHC).
+class IsString a where
+    fromString :: String -> a
+
+instance IsString [Char] where
+    fromString xs = xs
+