Move /src/test to /tests

tests/ui/pattern/usefulness/unstable-gated-patterns.rs

@@ -0,0 +1,22 @@
+#![feature(unstable_test_feature)]
+
+// aux-build:unstable.rs
+
+extern crate unstable;
+
+use unstable::UnstableEnum;
+
+fn main() {
+    match UnstableEnum::Stable {
+        UnstableEnum::Stable => {}
+        UnstableEnum::Stable2 => {}
+    }
+    //~^^^^ non-exhaustive patterns: `UnstableEnum::Unstable` not covered
+
+    // Ok: all variants are explicitly matched
+    match UnstableEnum::Stable {
+        UnstableEnum::Stable => {}
+        UnstableEnum::Stable2 => {}
+        UnstableEnum::Unstable => {}
+    }
+}