diff --git a/source/compiler/tests/gh_685.meta b/source/compiler/tests/gh_685.meta
new file mode 100644
index 0000000..da0cab3
--- /dev/null
+++ b/source/compiler/tests/gh_685.meta
@@ -0,0 +1,7 @@
+{
+  'test_type': 'output_check',
+  'errors': """
+gh_685.pwn(1) : error 010: invalid function or declaration
+gh_685.pwn(2) : error 010: invalid function or declaration
+  """
+}
diff --git a/source/compiler/tests/gh_685.pwn b/source/compiler/tests/gh_685.pwn
new file mode 100644
index 0000000..ef09047
--- /dev/null
+++ b/source/compiler/tests/gh_685.pwn
@@ -0,0 +1,4 @@
+native Tag:[1]operator +(Tag:a, Tag:b) = 0; // error 010: invalid function or declaration
+forward Tag:[1]operator -(Tag:a,Tag:b); // error 010: invalid function or declaration
+
+main () { }