https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83502
--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
Here's another test case with the same root cause (r190664):
$ cat u.C && gcc -S -Wall u.C
template <class T>
int __attribute__ ((warn_unused_result)) f (T) { return 0; }
template <>
int f<int> (int) { return 1; }
void fi () { f (0); }
u.C: In function ‘void fi()’:
u.C:7:16: warning: ignoring return value of ‘int f(T) [with T = int]’, declared
with attribute warn_unused_result [-Wunused-result]
void fi () { f (0); }
~~^~~
