[Bug c++/87150] [8 Regression] move ctor wrongly chosen in return stmt (derived vs. base)

[sbergman at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87150

--- Comment #15 from Stephan Bergmann <sbergman at redhat dot com> ---
I see that with the fix from comment 13 included, the slightly changed source

  #include <utility>
  struct S1 { S1(S1 &&); };
  struct S2: S1 {};
  S1 f(S2 s) { return std::move(s); }

causes -Wredundant-move (when that warning is explicitly requested).