Add a future for a case where I expect a lifetime error (#27071)

Adds a .future test for issue #27072. I ran into this case when writing
about the lifetime checker.

Test change only, not reviewed.

Author: mppf

test/classes/delete-free/lifetimes/return-ref-to-owned-local.bad

@@ -0,0 +1,31 @@
+// Note: I was expecting a lifetime error for this code
+// but it compiles without error.
+
+class C { var x: int; }
+
+proc getRefToVal() ref {
+  // allocate a class instance on the heap containing an integer field
+  var instance = new owned C(0);
+
+  // create a reference the field 'x' on the heap
+  ref refToVal = instance.x;
+
+  // return the reference
+  // note: the class instance is freed here before return!
+  return refToVal;
+}
+
+proc main() {
+  // create a reference the field 'x' on the heap
+  ref refToVal = getRefToVal();
+
+  refToVal = 42;
+
+  // do other heap operations to make heap corruption more visible
+  {
+    var x = new owned C(2);
+    var y = new owned C(3);
+  }
+
+  writeln(refToVal);
+}

test/classes/delete-free/lifetimes/return-ref-to-owned-local.chpl

@@ -0,0 +1,2 @@
+error message: missing lifetime checking error
+#27072

test/classes/delete-free/lifetimes/return-ref-to-owned-local.future

@@ -0,0 +1 @@
+some error about refToVal referring to something local