Fix for issue 594.

diff --git a/frontends/ast/genrtlil.cc b/frontends/ast/genrtlil.cc
index 0f7e910f35a57f041739e866fe085c4bc81437e2..c9345ff081a2a74efcf9e2598e5068d324108642 100644 (file)
--- a/frontends/ast/genrtlil.cc
+++ b/frontends/ast/genrtlil.cc
@@ -985,7 +985,8 @@ RTLIL::SigSpec AstNode::genRTLIL(int width_hint, bool sign_hint)
 
                use_const_chunk:
                        if (children.size() != 0) {
-                               log_assert(children[0]->type == AST_RANGE);
+                               if (children[0]->type != AST_RANGE)
+                                       log_file_error(filename, linenum, "Single range expected.\n");
                                int source_width = id2ast->range_left - id2ast->range_right + 1;
                                int source_offset = id2ast->range_right;
                                if (!children[0]->range_valid) {