diff --git a/tests/lang/eval-fail-bad-value.nix b/tests/lang/eval-fail-bad-value.nix
new file mode 100644
index 0000000000..97969145ee
--- /dev/null
+++ b/tests/lang/eval-fail-bad-value.nix
@@ -0,0 +1,7 @@
+let {
+
+  f = {x, y : ["baz" "bat"]}: x + y;
+
+  body = f {x = "foo"; y = "bar";};
+
+}
diff --git a/tests/lang/eval-okay-good-value.exp b/tests/lang/eval-okay-good-value.exp
new file mode 100644
index 0000000000..dddca4459b
--- /dev/null
+++ b/tests/lang/eval-okay-good-value.exp
@@ -0,0 +1 @@
+Str("foobar")
diff --git a/tests/lang/eval-okay-good-value.nix b/tests/lang/eval-okay-good-value.nix
new file mode 100644
index 0000000000..5dfc6d85e9
--- /dev/null
+++ b/tests/lang/eval-okay-good-value.nix
@@ -0,0 +1,7 @@
+let {
+
+  f = {x, y : ["baz" "bar" "bat"]}: x + y;
+
+  body = f {x = "foo"; y = "bar";};
+
+}