compiler: add missing Slice_info_expression::do_traverse

Fixes golang/go#59169

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/478176

diff --git a/gcc/go/gofrontend/expressions.h b/gcc/go/gofrontend/expressions.h
index 92e8d8d96b4d382adc0a60d9104f829aebf54bf4..5f34c1c1116cccf66a99f2afdf50f0db2ff8032b 100644 (file)
--- a/gcc/go/gofrontend/expressions.h
+++ b/gcc/go/gofrontend/expressions.h
@@ -4319,6 +4319,10 @@ class Slice_info_expression : public Expression
   { return this->slice_info_; }
 
  protected:
+  int
+  do_traverse(Traverse* traverse)
+  { return Expression::traverse(&this->slice_, traverse); }
+
   Type*
   do_type();