From 8a2c254915bac88a60f89fd6da8984b77a88da51 Mon Sep 17 00:00:00 2001
From: simonmar <unknown>
Date: Mon, 29 Apr 2002 15:37:48 +0000
Subject: [haddock @ 2002-04-29 15:37:48 by simonmar] Add an example

---
 examples/Foo.hs | 143 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 143 insertions(+)
 create mode 100644 examples/Foo.hs

diff --git a/examples/Foo.hs b/examples/Foo.hs
new file mode 100644
index 00000000..a4753aa9
--- /dev/null
+++ b/examples/Foo.hs
@@ -0,0 +1,143 @@
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Foo
+-- Copyright   :  (c) Simon Marlow 2002
+-- License     :  BSD-style
+-- 
+-- Maintainer  :  libraries@haskell.org
+-- Stability   :  provisional
+-- Portability :  portable
+--
+-- This is the module comment for the "Foo" module
+--
+-----------------------------------------------------------------------------
+
+-- This is plain comment, ignored by Haddock.
+
+module Foo ( 
+
+	-- Section headings are introduced with '-- *':
+	-- * Type declarations
+
+	-- Subsection headings are introduced with '-- **' and so on.
+	-- ** Data types
+	T(..), T2, T3(..), T4(..),
+	N1(..), N2(..), N3(..), N4,
+
+	-- ** Records
+	R(..),
+
+	-- * Class declarations
+	C(a,b), D(..), E, F(..),
+
+	-- * Function types
+	f, g,
+
+	-- * Auxiliary stuff
+	-- $aux
+   ) where
+
+
+-- | This comment applies to the /following/ declaration
+-- and it continues until the next non-comment line
+data T a b
+ = A Int (Maybe Float) -- ^ This comment describes the 'A' constructor
+ | -- | This comment describes the 'B' constructor
+   B (T a b, T Int Float) -- ^ 
+
+-- | An abstract data declaration
+data T2 a b = T2 a b
+
+-- | A data declaration with no documentation annotations on the constructors
+data T3 a b = A1 a | B1 b
+
+-- A data declaration with no documentation annotations at all
+data T4 a b = A2 a | B2 b
+
+-- | A newtype
+newtype N1 a b = N1 (a b)
+
+-- | A newtype with a fieldname
+newtype N2 a b = N2 {n :: a b}
+
+-- | A newtype with a fieldname, documentation on the field
+newtype N3 a b = N3 {n3 :: a b -- ^ this is the 'n3' field 
+		    }
+
+-- | An abstract newtype - we show this one as data rather than newtype because
+-- the difference isn\'t visible to the programmer for an abstract type.
+newtype N4 a b = N4 a
+
+class (D a) => C a  where
+   -- |this is a description of the 'a' method
+   a :: Int
+   b :: Float
+   -- ^ this is a description of the 'b' method
+   c :: Double -- c is hidden in the export list
+
+-- ^ This comment applies to the /previous/ declaration (the 'C' class)
+
+class D a where
+   d :: T a b
+   e :: (a,a)
+-- ^ This is a class declaration with no separate docs for the methods
+
+class E a where
+  ee :: Int
+-- ^ This is a class declaration with no methods (or no methods exported)
+
+-- This is a class declaration with no documentation at all
+class F a where
+  ff :: Float
+
+-- | This is the documentation for the 'R' record, which has four fields,
+-- 'p', 'q', 'r', and 's'.
+data R = 
+  C1 { p :: Int -- ^ This comment applies to the 'p' field
+     , q :: forall a . a->a  -- ^ This comment applies to the 'q' field
+     , -- | This comment applies to both 'r' and 's'
+       r,s :: Int
+     }
+
+-- These section headers are only used when there is no export list to
+-- give the structure of the documentation:
+
+-- * This is a section header (level 1)
+-- ** This is a section header (level 2)
+-- *** This is a section header (level 3)
+
+-- | In a comment string we can refer to identifiers in scope with
+-- single quotes like this: 'T', and we can refer to modules by
+-- using double quotes: "Foo".  We can add emphasis /like this/.
+--
+--   * This is a bulleted list
+--
+--   - This is the next item (different kind of bullet)
+--
+--   (1) This is an ordered list
+-- 
+--   2. This is the next item (different kind of bullet)
+--
+-- [
+--     This is a block of code, which can include other markup: 'R'
+--     formatting
+--               is
+--                 significant
+-- ]
+--
+-- We can also include URLs in documentation: <http://www.haskell.org/>.
+
+f :: C a => Int -> Int
+
+
+-- | we can export foreign declarations too
+foreign import ccall g :: Int -> IO CInt
+
+-- | this doc string has a parse error in it: '
+h :: Int
+h = 42
+
+
+-- $aux This is some documentation that is attached to a name ($aux)
+-- rather than a source declaration.  The documentation may be
+-- referred to in the export list using its name.
-- 
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