From: simonpj <unknown>
Date: Thu, 3 May 2001 08:18:35 +0000 (+0000)
Subject: [project @ 2001-05-03 08:18:35 by simonpj]
X-Git-Tag: Approximately_9120_patches~2025
X-Git-Url: http://git.megacz.com/?a=commitdiff_plain;h=0e5a48cc13843ff5d31963c711900652cc896649;p=ghc-hetmet.git

[project @ 2001-05-03 08:18:35 by simonpj]
Add a couple of tests
---

diff --git a/ghc/tests/typecheck/should_run/tcrun011.hs b/ghc/tests/typecheck/should_run/tcrun011.hs
new file mode 100644
index 0000000..204bd20
--- /dev/null
+++ b/ghc/tests/typecheck/should_run/tcrun011.hs
@@ -0,0 +1,24 @@
+{-# OPTIONS -fglasgow-exts #-}
+
+-- !!! Existential data tyes
+-- Hugs didn't like this one
+
+module Main (main) where
+
+
+class MyClass a b where
+	foo :: a -> b -> Int
+
+data Special = forall b. (MyClass Int b)=> MkSpecial b
+data General a = forall b. (MyClass a b)=> MkGeneral b
+
+instance MyClass Int Bool where
+   foo x False = -x
+   foo x True  = x
+
+xs :: [General Int]
+xs = [MkGeneral True, MkGeneral False]
+
+main = print [foo (3::Int) x | MkGeneral x <- xs]
+	-- Without the (::Int) part we get an 
+	-- incomprehensible error message :-(
diff --git a/ghc/tests/typecheck/should_run/tcrun011.stdout b/ghc/tests/typecheck/should_run/tcrun011.stdout
new file mode 100644
index 0000000..7984134
--- /dev/null
+++ b/ghc/tests/typecheck/should_run/tcrun011.stdout
@@ -0,0 +1 @@
+[3,-3]