Merge branch 'parser-improvements' of https://github.com/pennae/nix

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 3332dd703..3ebbdca63 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -1374,7 +1374,7 @@ void EvalState::callFunction(Value & fun, size_t nrArgs, Value * * args, Value &
                     /* Nope, so show the first unexpected argument to the
                        user. */
                     for (auto & i : *args[0]->attrs)
-                        if (!lambda.formals->argNames.count(i.name))
+                        if (!lambda.formals->has(i.name))
                             throwTypeError(pos, "%1% called with unexpected argument '%2%'", lambda, i.name);
                     abort(); // can't happen
                 }