Don't crash on erroneous type descriptor in interface conversion.

From-SVN: r170429

diff --git a/gcc/go/gofrontend/expressions.cc b/gcc/go/gofrontend/expressions.cc
index 264dd579b6f4fe2184247c864206068e5813e0ef..050942c619c48133f7e01548228aa36d51f64abf 100644 (file)
--- a/gcc/go/gofrontend/expressions.cc
+++ b/gcc/go/gofrontend/expressions.cc
@@ -362,6 +362,8 @@ Expression::convert_type_to_interface(Translate_context* context,
       first_field_value = fold_convert_loc(location, const_ptr_type_node,
                                           method_table);
     }
+  if (first_field_value == error_mark_node)
+    return error_mark_node;
 
   // Start building a constructor for the value we will return.