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diff --git a/lib/compiler/test/compilation_SUITE_data/guards.erl b/lib/compiler/test/compilation_SUITE_data/guards.erl
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+%%
+%% %CopyrightBegin%
+%% 
+%% Copyright Ericsson AB 1998-2009. All Rights Reserved.
+%% 
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%% 
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%% 
+%% %CopyrightEnd%
+%%
+-module(guards).
+
+-export([guards/0]).
+
+guards() ->
+    ok = t(),
+    ok = f(),
+    ok = ct(1),
+    ok = multi(1),
+    ok = multi(2),
+    ok = multi(3).
+
+%% The following tests are always true.
+t() when integer(42) ->
+    ok;
+t() when float(2.0) ->
+    ok;
+t() when number(7) ->
+    ok;
+t() when number(3.14) ->
+    ok;
+t() when atom(error) ->
+    ok;
+t() when list([a]) ->
+    ok;
+t() when tuple({}) ->
+    ok;
+t() when tuple({1, 2}) ->
+    ok.
+
+%% The following tests are always false.
+f() when integer(a) ->
+    ok;
+f() when float(b) ->
+    ok;
+f() when number(c) ->
+    ok;
+f() when atom(42) ->
+    ok;
+f() when list(33) ->
+    ok;
+f() when list({}) ->
+    ok;
+f() when list({1, 2}) ->
+    ok;
+f() when tuple(33) ->
+    ok;
+f() when tuple([a]) ->
+    ok;
+f() when tuple([]) ->
+    ok;
+f() when tuple(35) ->
+    ok;
+f() ->
+    ok.
+
+%% The following tests are always true.
+ct(X) ->
+    case X of
+	Y when integer(42) ->
+	    ok;
+	Y when float(2.0) ->
+	    ok;
+	Y when number(7) ->
+	    ok;
+	Y when number(3.14) ->
+	    ok;
+	Y when atom(error) ->
+	    ok;
+	Y when list([a]) ->
+	    ok;
+	Y when tuple({}) ->
+	    ok;
+	Y when tuple({1, 2}) ->
+	    ok
+    end.
+
+multi(X) ->
+    case X of
+	Y when float(Y) ; integer(Y) ->
+	    ok;
+	Y when Y > 1, Y < 10 ; atom(Y) ->
+	    ok;
+	Y when Y == 4, number(Y) ; list(Y) ->
+	    pannkaka;
+	Y when Y==3 ; Y==5 ; Y==6 ->
+	    ok
+    end.