Move /src/test to /tests

tests/ui/span/regions-escape-loop-via-variable.rs

@@ -0,0 +1,14 @@
+fn main() {
+    let x = 3;
+
+    // Here, the variable `p` gets inferred to a type with a lifetime
+    // of the loop body.  The regionck then determines that this type
+    // is invalid.
+    let mut p = &x;
+
+    loop {
+        let x = 1 + *p;
+        p = &x;
+    }
+    //~^^ ERROR `x` does not live long enough
+}