Use `emplace()` rather than `insert()`.

diff --git a/passes/techmap/techmap.cc b/passes/techmap/techmap.cc
index 548a80b01795e7a5718d24c19203567db6438402..17d98847ebbc3b039be127ce799f7e27d8669141 100644 (file)
--- a/passes/techmap/techmap.cc
+++ b/passes/techmap/techmap.cc
@@ -213,7 +213,7 @@ struct TechmapWorker
                        if (tpl_w->port_id > 0)
                        {
                                IdString posportname = stringf("$%d", tpl_w->port_id);
-                               positional_ports[posportname] = tpl_w->name;
+                               positional_ports.emplace(posportname, tpl_w->name);
 
                                if (!flatten_mode && tpl_w->get_bool_attribute(ID::techmap_autopurge) &&
                                                (!cell->hasPort(tpl_w->name) || !GetSize(cell->getPort(tpl_w->name))) &&