[Bug libstdc++/87431] valueless_by_exception() should unconditionally return false if all the constructors are noexcept

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87431

--- Comment #16 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Tue Jan  8 23:15:49 2019
New Revision: 267743

URL: https://gcc.gnu.org/viewcvs?rev=267743&root=gcc&view=rev
Log:
Pretty printer test fixes and improvements

Test that StdUniquePtrPrinter correctly prints std::unique_ptr objects
using the old layout, prior to the PR libstdc++/77990 changes.

The printer test for a valueless std::variant started to fail because
the PR libstdc++/87431 fix meant it no longer became valueless. Change
the test to use a type that is not trivially copyable, so that the
exception causes it to become valueless.

        * testsuite/libstdc++-prettyprinters/compat.cc: Test printer support
        for old std::unique_ptr layout.
        * testsuite/libstdc++-prettyprinters/cxx17.cc: Fix std::variant test
        to become valueless. Add filesystem::path tests.

Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/testsuite/libstdc++-prettyprinters/compat.cc
    trunk/libstdc++-v3/testsuite/libstdc++-prettyprinters/cxx17.cc