add a test for the memory leak error

diff --git a/tests/compile-fail/memleak.rs b/tests/compile-fail/memleak.rs
new file mode 100644 (file)
index 0000000..71b4e2f
--- /dev/null
+++ b/tests/compile-fail/memleak.rs
@@ -0,0 +1,5 @@
+//error-pattern: the evaluated program leaked memory
+
+fn main() {
+    std::mem::forget(Box::new(42));
+}