https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65575
--- Comment #2 from Tom Honermann <tom at honermann dot net> ---
r221695 does correct the specific test case in comment 0. However, I'm still
seeing similar errors for function declarations that don't specify the return
type with a trailing return type:
$ svn info # From my local svn gcc repo.
Path: .
URL: svn://gcc.gnu.org/svn/gcc/branches/c++-concepts
Repository Root: svn://gcc.gnu.org/svn/gcc
Repository UUID: 138bc75d-0d04-0410-961f-82ee72b054a4
Revision: 221697
Node Kind: directory
Schedule: normal
Last Changed Author: asutton
Last Changed Rev: 221695
Last Changed Date: 2015-03-26 09:35:54 -0400 (Thu, 26 Mar 2015)
$ cat t2.cpp
template<typename T>
concept bool C = true;
int& f() requires C<int>;
$ g++ -c -std=c++1z t2.cpp
t2.cpp:3:10: error: expected initializer before ‘requires’
int& f() requires C<int>;
^
