Don't define builtins.{currentSystem,currentTime} in pure mode

This makes it easier to provide a default, e.g.

  system = builtins.currentSystem or "x86_64-linux";

1 files changed, 2 insertions, 6 deletions

diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index e90a1da25e0b..975f0e8309e6 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -1997,16 +1997,12 @@ void EvalState::createBaseEnv()
         addConstant(name, v);
     };
 
-    if (settings.pureEval)
-        addPurityError("__currentTime");
-    else {
+    if (!settings.pureEval) {
         mkInt(v, time(0));
         addConstant("__currentTime", v);
     }
 
-    if (settings.pureEval)
-        addPurityError("__currentSystem");
-    else {
+    if (!settings.pureEval) {
         mkString(v, settings.thisSystem);
         addConstant("__currentSystem", v);
     }