X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;ds=sidebyside;f=docs%2Fusers_guide%2Fglasgow_exts.xml;h=09fd3f509fd4efbab42e79ee8ffaa3e7e508f797;hb=bebf54b1fefef0c337955ec1e653b44f4ec63d10;hp=afb4447e245d5c4d9f917b555e2dc708ace72bab;hpb=f078c03636b809f4a8bc1caa1deecd58ff5491fe;p=ghc-hetmet.git
diff --git a/docs/users_guide/glasgow_exts.xml b/docs/users_guide/glasgow_exts.xml
index afb4447..09fd3f5 100644
--- a/docs/users_guide/glasgow_exts.xml
+++ b/docs/users_guide/glasgow_exts.xml
@@ -3360,7 +3360,7 @@ signature.
For example:
-- f and g assume that 'a' is already in scope
- f = \(x::Int, y) -> x
+ f = \(x::Int, y::a) -> x
g (x::a) = x
h ((x,y) :: (Int,Bool)) = (y,x)
@@ -3778,9 +3778,9 @@ pattern binding must have the same context. For example, this is fine:
-Generalised Algebraic Data Types
+Generalised Algebraic Data Types (GADTs)
-Generalised Algebraic Data Types (GADTs) generalise ordinary algebraic data types by allowing you
+Generalised Algebraic Data Types generalise ordinary algebraic data types by allowing you
to give the type signatures of constructors explicitly. For example:
data Term a where
@@ -3801,7 +3801,12 @@ for these Terms:
eval (If b e1 e2) = if eval b then eval e1 else eval e2
eval (Pair e1 e2) = (eval e1, eval e2)
-These and many other examples are given in papers by Hongwei Xi, and Tim Sheard.
+These and many other examples are given in papers by Hongwei Xi, and
+Tim Sheard. There is a longer introduction
+on the wiki,
+and Ralf Hinze's
+Fun with phantom types also has a number of examples. Note that papers
+may use different notation to that implemented in GHC.
The rest of this section outlines the extensions to GHC that support GADTs.