Add test case to cover version.c.

test/fail_compilation/test13786.d

@@ -0,0 +1,20 @@
+/*
+TEST_OUTPUT:
+---
+fail_compilation/test13786.d(14): Error: debug __anonymous level declaration must be at module level
+fail_compilation/test13786.d(15): Error: debug abc declaration must be at module level
+fail_compilation/test13786.d(16): Error: version __anonymous level declaration must be at module level
+fail_compilation/test13786.d(17): Error: version abc declaration must be at module level
+fail_compilation/test13786.d(20): Error: template instance test13786.T!() error instantiating
+---
+*/
+
+template T()
+{
+    debug = 123;
+    debug = abc;
+    version = 123;
+    version = abc;
+}
+
+alias X = T!();