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lix/tests/plugins/plugintest.cc

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#include "globals.hh"
#include "primops.hh"
using namespace nix;
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static BaseSetting<bool> settingSet{false, "setting-set",
"Whether the plugin-defined setting was set"};
static RegisterSetting rs(&settingSet);
static void prim_anotherNull (EvalState & state, const Pos & pos, Value ** args, Value & v)
{
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if (settingSet)
mkNull(v);
else
mkBool(v, false);
}
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static RegisterPrimOp rp("anotherNull", 0, prim_anotherNull);