Test suites for Dialyzer

This is a transcription of most of the cvs.srv.it.uu.se:/hipe repository
dialyzer_tests into test suites that use the test server framework.

See README for information on how to use the included scripts for
modifications and updates.

When testing Dialyzer it's important that several OTP modules
are included in the plt. The suites takes care of that too.

1 files changed, 22 insertions, 0 deletions

diff --git a/lib/dialyzer/test/small_tests_SUITE_data/src/confusing_warning.erl b/lib/dialyzer/test/small_tests_SUITE_data/src/confusing_warning.erl
new file mode 100644
index 0000000000..c82df0f056
--- /dev/null
+++ b/lib/dialyzer/test/small_tests_SUITE_data/src/confusing_warning.erl
@@ -0,0 +1,22 @@
+%% Test case that results in a confusing warning -- created from a
+%% very stripped down actual application. The second case clause of
+%% test/1 cannot possibly match because all a-pairs match with the
+%% first clause. Dialyzer complains that the second argument of the
+%% second 2-tuple has type 'aaa' | 'bbb'. This is mucho confusing
+%% since there is no 'a'-pair whose second element is 'aaa' | 'bbb'.
+%% Pattern matching compilation is of course what's to blame here.
+
+-module(confusing_warning).
+-export([test/1]).
+
+test(N) when is_integer(N) ->
+  case foo(N) of
+    {a, I} when is_integer(I) ->
+      I;
+    {a, {_, L}} ->	% this clause cannot possibly match
+      L
+  end.
+
+foo(1) -> {a, 42};
+foo(2) -> {b, aaa};	% this is really unused
+foo(3) -> {b, bbb}.	% this is really unused