diff --git a/tests/plat/_dummy.c b/tests/plat/_dummy_e.c
similarity index 100%
rename from tests/plat/_dummy.c
rename to tests/plat/_dummy_e.c
diff --git a/tests/plat/bugs/bug-22-inn_mod.mod b/tests/plat/bugs/bug-22-inn_mod.mod
new file mode 100644
index 000000000..8f3a2d00a
--- /dev/null
+++ b/tests/plat/bugs/bug-22-inn_mod.mod
@@ -0,0 +1,26 @@
+MODULE test;
+FROM InOut IMPORT WriteLn, WriteString;
+
+TYPE charset = SET OF CHAR;
+
+PROCEDURE Space(c: CHAR): BOOLEAN;
+BEGIN
+  RETURN c IN charset{' ', 11C, 12C, 15C}
+END Space;
+
+BEGIN
+  IF Space('a') THEN
+    WriteString("@@FAIL 1");
+    WriteLn;
+  END;
+  IF NOT Space(' ') THEN
+    WriteString("@@FAIL 2");
+    WriteLn;
+  END;
+  IF NOT Space(12C) THEN
+    WriteString("@@FAIL 3");
+    WriteLn;
+  END;
+  WriteString("@@FINISHED");
+  WriteLn;
+END test.
\ No newline at end of file
diff --git a/tests/plat/build.lua b/tests/plat/build.lua
index f5885a190..d8362b3a0 100644
--- a/tests/plat/build.lua
+++ b/tests/plat/build.lua
@@ -11,7 +11,8 @@ definerule("plat_testsuite",
 		local testfiles = filenamesof(
 			"tests/plat/*.c",
 			"tests/plat/*.e",
-			"tests/plat/*.p"
+			"tests/plat/*.p",
+			"tests/plat/bugs/*.mod"
 		)
 
 		acklibrary {
@@ -23,8 +24,8 @@ definerule("plat_testsuite",
 
 		local tests = {}
 		for _, f in ipairs(testfiles) do
-			local fs = replace(basename(f), "%..$", "")
-			local _, _, lang = fs:find("_(.)$")
+			local fs = replace(basename(f), "%.[^.]+$", "")
+			local _, _, lang = fs:find("_([^_]+)$")
 			if not lang then
 				lang = "e"
 			end
@@ -49,7 +50,7 @@ definerule("plat_testsuite",
 					"util/build+testrunner"
 				},
 				commands = {
-					"(%{ins[2]} "..e.method.." %{ins[1]} 5 %{ins[3]} || echo FAILED) 2>&1 > %{outs}",
+					"(%{ins[2]} "..e.method.." %{ins[1]} 5 %{ins[3]} || echo FAILED) > %{outs}",
 				}
 			}
 		end