test: add more ManualOwnership coverage

test/SIL/manual_ownership.swift

@@ -56,6 +56,24 @@ public func basic_return3() -> Triangle {
   return Triangle()
 }
 
+// FIXME: we need copy propagation in -Onone to eliminate all these copies
+@_manualOwnership
+func reassign_with_lets() -> Triangle {
+  let x = Triangle()
+  let y = x // expected-error {{explicit 'copy' required here}}
+  let z = y // expected-error {{explicit 'copy' required here}}
+  return z // expected-error {{explicit 'copy' required here}}
+}
+
+// FIXME: we need copy propagation in -Onone to eliminate all but the copies for returning
+@_manualOwnership
+func renamed_return(_ cond: Bool, _ a: Triangle) -> Triangle {
+  let b = a // expected-error {{explicit 'copy' required here}}
+  let c = b // expected-error {{explicit 'copy' required here}}
+  if cond { return b } // expected-error {{explicit 'copy' required here}}
+  return c // expected-error {{explicit 'copy' required here}}
+}
+
 /// MARK: method calls
 
 @_manualOwnership
@@ -152,3 +170,17 @@ public func basic_loop_nontrivial_values_fixed(_ t: Triangle, _ xs: [Triangle])
   }
   (copy t.nontrivial).a = p // expected-error {{explicit 'copy' required here}}
 }
+
+
+/// MARK: Globals
+let ref_result = [5, 13, 29]
+
+@_manualOwnership
+func access_global_1() -> Int {
+  return ref_result[2] // expected-error {{explicit 'copy' required here}}
+}
+@_manualOwnership
+func access_global_1_fixed() -> Int {
+return (copy ref_result)[2]
+}
+