Add function call to test

Author: varkor

src/test/ui/lint/must_use-tuple.rs

@@ -1,9 +1,15 @@
 #![deny(unused_must_use)]
 
+fn foo() -> Result<(), ()> {
+    Ok::<(), ()>(())
+}
+
 fn main() {
     (Ok::<(), ()>(()),); //~ ERROR unused `std::result::Result` that must be used
 
     (Ok::<(), ()>(()), 0, Ok::<(), ()>(()), 5);
     //~^ ERROR unused `std::result::Result` that must be used
     //~^^ ERROR unused `std::result::Result` that must be used
+
+    foo(); //~ ERROR unused `std::result::Result` that must be used
 }

src/test/ui/lint/must_use-tuple.stderr

@@ -1,5 +1,5 @@
 error: unused `std::result::Result` that must be used
-  --> $DIR/must_use-tuple.rs:4:6
+  --> $DIR/must_use-tuple.rs:8:6
    |
 LL |     (Ok::<(), ()>(()),);
    |      ^^^^^^^^^^^^^^^^
@@ -12,20 +12,28 @@ LL | #![deny(unused_must_use)]
    = note: this `Result` may be an `Err` variant, which should be handled
 
 error: unused `std::result::Result` that must be used
-  --> $DIR/must_use-tuple.rs:6:6
+  --> $DIR/must_use-tuple.rs:10:6
    |
 LL |     (Ok::<(), ()>(()), 0, Ok::<(), ()>(()), 5);
    |      ^^^^^^^^^^^^^^^^
    |
    = note: this `Result` may be an `Err` variant, which should be handled
 
 error: unused `std::result::Result` that must be used
-  --> $DIR/must_use-tuple.rs:6:27
+  --> $DIR/must_use-tuple.rs:10:27
    |
 LL |     (Ok::<(), ()>(()), 0, Ok::<(), ()>(()), 5);
    |                           ^^^^^^^^^^^^^^^^
    |
    = note: this `Result` may be an `Err` variant, which should be handled
 
-error: aborting due to 3 previous errors
+error: unused `std::result::Result` that must be used
+  --> $DIR/must_use-tuple.rs:14:5
+   |
+LL |     foo();
+   |     ^^^^^^
+   |
+   = note: this `Result` may be an `Err` variant, which should be handled
+
+error: aborting due to 4 previous errors