[m-rev.] diff: fix test case failure in C# and Java grades

[Julien Fischer]

Branches: 20.01, master

-----------------------

Fix test case failure in C# and Java grades.

tests/hard_coded/stream_string_writer_types.m:
     Add missing foreign_proc definitions for C# and Java.

Julien.

diff --git a/tests/hard_coded/stream_string_writer_types.m b/tests/hard_coded/stream_string_writer_types.m
index df7ad8e..e34f8af 100644
--- a/tests/hard_coded/stream_string_writer_types.m
+++ b/tests/hard_coded/stream_string_writer_types.m
@@ -81,3 +81,17 @@ write_type_ctor_of(X, !IO) :-
  "
      Ptr = 0;
  ").
+
+:- pragma foreign_proc("C#",
+    get_c_pointer = (Ptr::out),
+    [promise_pure, thread_safe],
+"
+    Ptr = null;
+").
+
+:- pragma foreign_proc("Java",
+    get_c_pointer = (Ptr::out),
+    [promise_pure, thread_safe],
+"
+    Ptr = null;
+").