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-rw-r--r--src/libexpr/eval.hh3
-rw-r--r--src/libexpr/primops.cc7
2 files changed, 7 insertions, 3 deletions
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index 2291d618c..411364d9f 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -17,6 +17,7 @@
#include <optional>
#include <unordered_map>
#include <mutex>
+#include <functional>
namespace nix {
@@ -71,7 +72,7 @@ struct PrimOp
/**
* Implementation of the primop.
*/
- PrimOpFun fun;
+ std::function<std::remove_pointer<PrimOpFun>::type> fun;
/**
* Optional experimental for this to be gated on.
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index e36b800c3..77e7cf22b 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -3329,8 +3329,11 @@ static void prim_sort(EvalState & state, const PosIdx pos, Value * * args, Value
callFunction. */
/* TODO: (layus) this is absurd. An optimisation like this
should be outside the lambda creation */
- if (args[0]->isPrimOp() && args[0]->primOp->fun == prim_lessThan)
- return CompareValues(state, noPos, "while evaluating the ordering function passed to builtins.sort")(a, b);
+ if (args[0]->isPrimOp()) {
+ auto ptr = args[0]->primOp->fun.target<decltype(&prim_lessThan)>();
+ if (ptr && *ptr == prim_lessThan)
+ return CompareValues(state, noPos, "while evaluating the ordering function passed to builtins.sort")(a, b);
+ }
Value * vs[] = {a, b};
Value vBool;