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The current standard draft (n4861) amends the cpp builtin for coroutines to '__cpp_impl_coroutine', no other change. gcc/c-family/ChangeLog: 2020-04-13 Iain Sandoe <iain@sandoe.co.uk> * c-cppbuiltin.c (c_cpp_builtins): Update coroutines builtin define, per n4861. gcc/testsuite/ChangeLog: 2020-04-13 Iain Sandoe <iain@sandoe.co.uk> * g++.dg/coroutines/coro-pre-proc.C: Update coroutines builtin define, per n4861. * g++.dg/coroutines/coro.h: Likewise. libstdc++-v3/ChangeLog: 2020-04-13 Iain Sandoe <iain@sandoe.co.uk> * include/std/coroutine: Update coroutines builtin define, per n4861.