1 files changed, 42 insertions, 0 deletions
diff --git a/tests/ui/lint/unused/unused-result.rs b/tests/ui/lint/unused/unused-result.rs
new file mode 100644
index 000000000..e283eaa88
--- /dev/null
+++ b/tests/ui/lint/unused/unused-result.rs
@@ -0,0 +1,42 @@
+#![allow(dead_code)]
+#![deny(unused_results, unused_must_use)]
+//~^ NOTE: the lint level is defined here
+//~| NOTE: the lint level is defined here
+
+#[must_use]
+enum MustUse { Test }
+
+#[must_use = "some message"]
+enum MustUseMsg { Test2 }
+
+fn foo<T>() -> T { panic!() }
+
+fn bar() -> isize { return foo::<isize>(); }
+fn baz() -> MustUse { return foo::<MustUse>(); }
+fn qux() -> MustUseMsg { return foo::<MustUseMsg>(); }
+
+#[allow(unused_results)]
+fn test() {
+    foo::<isize>();
+    foo::<MustUse>(); //~ ERROR: unused `MustUse` that must be used
+    foo::<MustUseMsg>(); //~ ERROR: unused `MustUseMsg` that must be used
+    //~^ NOTE: some message
+}
+
+#[allow(unused_results, unused_must_use)]
+fn test2() {
+    foo::<isize>();
+    foo::<MustUse>();
+    foo::<MustUseMsg>();
+}
+
+fn main() {
+    foo::<isize>(); //~ ERROR: unused result of type `isize`
+    foo::<MustUse>(); //~ ERROR: unused `MustUse` that must be used
+    foo::<MustUseMsg>(); //~ ERROR: unused `MustUseMsg` that must be used
+    //~^ NOTE: some message
+
+    let _ = foo::<isize>();
+    let _ = foo::<MustUse>();
+    let _ = foo::<MustUseMsg>();
+}