Added a failing test for the let + fields bug

#6

src/tests/encore/basic/let-fields.enc

@@ -0,0 +1,16 @@
+class Main
+  value : int
+  def main() : void {
+    this.value = 1024;
+    let x = this.value in {
+      x = x + 1;
+      if x == 1024 then
+        print "Failue when reading x -- expected 1024, got something else"
+      else
+        print "Test 1 OK";
+      if x == this.value then
+        print "Failue when comparing x and this.value -- they are the same but should not be"
+      else
+        print "Test 2 OK";
+    }
+  }

src/tests/encore/basic/let-fields.out

@@ -0,0 +1,2 @@
+Test 1 OK
+Test 2 OK