{ stdenv, fetchFromGitHub, cmake }: stdenv.mkDerivation rec { pname = "tl-expected-unstable"; version = "2019-11-11"; # 5 commits ahead of version 1.0.0 src = fetchFromGitHub { owner = "TartanLlama"; repo = "expected"; rev = "1d9c5d8c0da84b8ddc54bd3d90d632eec95c1f13"; fetchSubmodules = true; sha256 = "0rzfn9yyg70zwpxbmv22qy0015baymi2rdd65ixmcb31fgnap68i"; }; nativeBuildInputs = [ cmake ]; meta = with stdenv.lib; { description = "C++11/14/17 std::expected with functional-style extensions"; homepage = "https://tl.tartanllama.xyz/en/latest/api/expected.html"; license = licenses.cc0; platforms = platforms.all; maintainers = with maintainers; [ primeos ]; }; }