librustc: Unconfigure tests during normal build

src/librustc/tests.rs

@@ -0,0 +1,13 @@
+use super::*;
+
+// FIXME(#27438): right now the unit tests of librustc don't refer to any actual
+//                functions generated in librustc_data_structures (all
+//                references are through generic functions), but statics are
+//                referenced from time to time. Due to this bug we won't
+//                actually correctly link in the statics unless we also
+//                reference a function, so be sure to reference a dummy
+//                function.
+#[test]
+fn noop() {
+    rustc_data_structures::__noop_fix_for_27438();
+}