Rename std$vector$T$length to match std::vector<T>::size
diff --git a/gen/write.rs b/gen/write.rs
index c1aa2f7..3da42b3 100644
--- a/gen/write.rs
+++ b/gen/write.rs
@@ -1131,7 +1131,7 @@
     writeln!(out, "#define CXXBRIDGE02_vector_{}", instance);
     writeln!(
         out,
-        "size_t cxxbridge02$std$vector${}$length(const ::std::vector<{}> &s) noexcept {{",
+        "size_t cxxbridge02$std$vector${}$size(const ::std::vector<{}> &s) noexcept {{",
         instance, inner,
     );
     writeln!(out, "  return s.size();");