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-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-deferred-unary-formals.exp1
-rw-r--r--tvix/eval/src/tests/tvix_tests/eval-okay-deferred-unary-formals.nix6
2 files changed, 7 insertions, 0 deletions
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-deferred-unary-formals.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-deferred-unary-formals.exp
new file mode 100644
index 000000000000..5993db7ccc5a
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-deferred-unary-formals.exp
@@ -0,0 +1 @@
+[ false -2 ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-deferred-unary-formals.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-deferred-unary-formals.nix
new file mode 100644
index 000000000000..1fbb3e853af4
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-deferred-unary-formals.nix
@@ -0,0 +1,6 @@
+# Application of unary operators on deferred formals arguments (via
+# defaulting), see also b/255.
+[
+  (({ b ? !a, a }: b) { a = true; })
+  (({ b ? -a, a }: b) { a = 2; })
+]