Merge pull request #20796 from lydia-duncan/addConstForwardTest

Add a tests tracking the behavior with forwarding
[new tests, not reviewed]

Adds two tests:
- forwarding const methods
- forwarding iterators

I don't think either of these cases were explicitly tracked today, but they
work if I get the forwarding statement right (which I didn't right away).

Passed a fresh checkout

test/classes/forwarding/constMethod.chpl

@@ -0,0 +1,19 @@
+record Foo {
+  var b: shared Bar?;
+  forwarding b!;
+
+  proc init() {
+    b = new shared Bar();
+  }
+}
+
+class Bar {
+  proc const whatever() {
+    return 16;
+  }
+}
+
+proc main() {
+  var f = new Foo();
+  writeln(f.whatever());
+}

test/classes/forwarding/constMethod.good

@@ -0,0 +1 @@
+16

test/classes/forwarding/forwardIterator.chpl

@@ -0,0 +1,30 @@
+record Foo {
+  var b: shared Bar?;
+  forwarding b!;
+
+  proc init(num: int) {
+    b = new shared Bar(num);
+  }
+}
+
+class Bar {
+  var r: range;
+
+  proc init(num: int) {
+    r = 0..#num;
+  }
+
+  iter all() {
+    for i in r {
+      yield i;
+    }
+  }
+}
+
+proc main() {
+  var f = new Foo(10);
+
+  for i in f.all() {
+    writeln(i);
+  }
+}

test/classes/forwarding/forwardIterator.good

@@ -0,0 +1,10 @@
+0
+1
+2
+3
+4
+5
+6
+7
+8
+9