https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96878
--- Comment #1 from Stephan Bergmann <sbergman at redhat dot com> ---
A similar failure happens with typeid (but where the parentheses are not
redundant), and I naively assume it's the same underlying issue:
> $ cat test.cc
> #include <typeinfo>
> template<int N> struct S { S(char const (& s)[N]); };
> void f() { (void) typeid (S("")); }
> $ g++ -std=c++17 -fsyntax-only test.cc
> test.cc: In function ‘void f()’:
> test.cc:3:27: error: missing template arguments after ‘S<...auto...>’
> 3 | void f() { (void) typeid (S("")); }
> | ^
> test.cc:2:24: note: ‘template<int N> struct S’ declared here
> 2 | template<int N> struct S { S(char const (& s)[N]); };
> | ^
