http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59766
Bug ID: 59766 Summary: c++1y: declaring friend function with 'auto' return type deduction is rejected with bogus reason Product: gcc Version: 4.8.2 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: mizvekov at gmail dot com Simple example showing the problem: struct foo { friend auto test(const foo &) { return 0; } }; g++ rejects this with: test.cc:2:30: error: non-static data member declared ‘auto’ friend auto test(const foo &) { return 0; }