1 files changed, 14 insertions, 0 deletions
diff --git a/gcc/go/gofrontend/expressions.cc b/gcc/go/gofrontend/expressions.cc
index 89b265b..e7d0b75 100644
--- a/gcc/go/gofrontend/expressions.cc
+++ b/gcc/go/gofrontend/expressions.cc
@@ -10898,6 +10898,20 @@ Array_index_expression::do_check_types(Gogo*)
     }
 }
 
+// The subexpressions of an array index must be evaluated in order.
+// If this is indexing into an array, rather than a slice, then only
+// the index should be evaluated.  Since this is called for values on
+// the left hand side of an assigment, evaluating the array, meaning
+// copying the array, will cause a different array to be modified.
+
+bool
+Array_index_expression::do_must_eval_subexpressions_in_order(
+    int* skip) const
+{
+  *skip = this->array_->type()->is_slice_type() ? 0 : 1;
+  return true;
+}
+
 // Flatten array indexing by using temporary variables for slices and indexes.
 
 Expression*