Add C comment that '=' is not documented for plpgsql assignment.

diff --git a/src/pl/plpgsql/src/gram.y b/src/pl/plpgsql/src/gram.y
index 4b2dce8cf0758ca05fc59c7a345c3d1a9c031085..4967a2a6a79eef7509790989fb3c7537a72750cc 100644 (file)
--- a/src/pl/plpgsql/src/gram.y
+++ b/src/pl/plpgsql/src/gram.y
@@ -746,7 +746,7 @@ decl_defkey         : assign_operator
                                | K_DEFAULT
                                ;
 
-assign_operator        : '='
+assign_operator        : '='   /* not documented because it might be removed someday */
                                | COLON_EQUALS
                                ;