diff --git a/test/testtokenize.cpp b/test/testtokenize.cpp
index 8bcdae7c72d..fc67ea64b4f 100644
--- a/test/testtokenize.cpp
+++ b/test/testtokenize.cpp
@@ -7026,6 +7026,7 @@ class TestTokenizer : public TestFixture {
         ASSERT_EQUALS("Cc& csize.(", testAst("template<class C> constexpr auto s(const C &c) noexcept -> decltype(c.size()) {}"));
         ASSERT_EQUALS("Cc& MakeSpancdata.(csize.(,(",
                       testAst("template <typename C> constexpr auto MakeSpan(C &c) -> decltype(MakeSpan(c.data(), c.size())) {}"));
+        ASSERT_EQUALS("Eqeq&key_typek&, eqkk,(", testAst("auto KeyTypeCanBeEq(const Eq& eq, const key_type& k) -> decltype(eq(k, k));"));
     }
     void astnoexcept() {
         ASSERT_EQUALS("noexceptaswap.b((", testAst("void f() noexcept(noexcept(a.swap(b))) {}"));