libstdc++-v3/ChangeLog:
PR libstdc++/71579
* include/std/type_traits (invoke_result, is_invocable)
(is_invocable_r, is_nothrow_invocable, is_nothrow_invocable_r):
Add static_asserts to make sure that the arguments of the type
traits are not misused with incomplete types.
* testsuite/20_util/invoke_result/incomplete_args_neg.cc: New test.
* testsuite/20_util/is_invocable/incomplete_args_neg.cc: New test.
* testsuite/20_util/is_invocable/incomplete_neg.cc: New test.
* testsuite/20_util/is_nothrow_invocable/incomplete_args_neg.cc:
New test.
* testsuite/20_util/is_nothrow_invocable/incomplete_neg.cc: Check
for error on incomplete type usage in trait.
c1fc9f6e10