depot/third_party/nixpkgs/pkgs/development/compilers/rust/rust-src.nix

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{ stdenv, rustc }:
stdenv.mkDerivation {
name = "rust-src";
src = rustc.src;
phases = [ "unpackPhase" "installPhase" ];
installPhase = ''
mv src $out
rm -rf $out/{ci,doc,etc,grammar,llvm-project,llvm-emscripten,rtstartup,rustllvm,test,tools,vendor,stdarch}
'';
}