gcc/testsuite/g++.dg/modules/std-subst-4_a.C

// { dg-additional-options "-fmodules-ts -Wno-pedantic" }

module;
# 5 __FILE__ 1
namespace std {
template <typename A> struct allocator {};
template <typename C, typename T, typename A>
class basic_string;
} // namespace std
# 12 "" 2
export module RenameString;
// { dg-module-cmi RenameString }
export template <typename C, typename T>
using str = std::basic_string<C, T, std::allocator<C>>;