My recent fix for c++/88612 fixed these two testcases too. Let's add them.
Tested on x86_64-linux, applying to trunk. 2019-01-02 Marek Polacek <pola...@redhat.com> PR c++/81486 - CTAD failing with (). * g++.dg/cpp1z/class-deduction60.C: New test. * g++.dg/cpp1z/class-deduction61.C: New test. diff --git gcc/testsuite/g++.dg/cpp1z/class-deduction60.C gcc/testsuite/g++.dg/cpp1z/class-deduction60.C new file mode 100644 index 00000000000..dbc5732a2a8 --- /dev/null +++ gcc/testsuite/g++.dg/cpp1z/class-deduction60.C @@ -0,0 +1,19 @@ +// PR c++/81486 +// { dg-do compile { target c++17 } } + +template <class T> +struct C { + C(T); +}; + +template <> +struct C<void> { }; + +C() -> C<void>; + +int +main() +{ + auto a = C{}; + auto b = C(); +} diff --git gcc/testsuite/g++.dg/cpp1z/class-deduction61.C gcc/testsuite/g++.dg/cpp1z/class-deduction61.C new file mode 100644 index 00000000000..9ef095e2af0 --- /dev/null +++ gcc/testsuite/g++.dg/cpp1z/class-deduction61.C @@ -0,0 +1,15 @@ +// PR c++/81486 +// { dg-do compile { target c++17 } } + +template <typename... Ts> +struct foo +{ + template <typename... Us> + foo(Us...) { } +}; + +int +main () +{ + auto f = foo(); +}