1 files changed, 93 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/must_use_candidates.rs b/src/tools/clippy/tests/ui/must_use_candidates.rs
new file mode 100644
index 000000000..f04122f4e
--- /dev/null
+++ b/src/tools/clippy/tests/ui/must_use_candidates.rs
@@ -0,0 +1,93 @@
+// run-rustfix
+#![feature(never_type)]
+#![allow(unused_mut, unused_tuple_struct_fields, clippy::redundant_allocation)]
+#![warn(clippy::must_use_candidate)]
+use std::rc::Rc;
+use std::sync::atomic::{AtomicBool, Ordering};
+use std::sync::Arc;
+
+pub struct MyAtomic(AtomicBool);
+pub struct MyPure;
+
+pub fn pure(i: u8) -> u8 {
+    i
+}
+
+impl MyPure {
+    pub fn inherent_pure(&self) -> u8 {
+        0
+    }
+}
+
+pub trait MyPureTrait {
+    fn trait_pure(&self, i: u32) -> u32 {
+        self.trait_impl_pure(i) + 1
+    }
+
+    fn trait_impl_pure(&self, i: u32) -> u32;
+}
+
+impl MyPureTrait for MyPure {
+    fn trait_impl_pure(&self, i: u32) -> u32 {
+        i
+    }
+}
+
+pub fn without_result() {
+    // OK
+}
+
+pub fn impure_primitive(i: &mut u8) -> u8 {
+    *i
+}
+
+pub fn with_callback<F: Fn(u32) -> bool>(f: &F) -> bool {
+    f(0)
+}
+
+pub fn with_marker(_d: std::marker::PhantomData<&mut u32>) -> bool {
+    true
+}
+
+pub fn quoth_the_raven(_more: !) -> u32 {
+    unimplemented!();
+}
+
+pub fn atomics(b: &AtomicBool) -> bool {
+    b.load(Ordering::SeqCst)
+}
+
+pub fn rcd(_x: Rc<u32>) -> bool {
+    true
+}
+
+pub fn rcmut(_x: Rc<&mut u32>) -> bool {
+    true
+}
+
+pub fn arcd(_x: Arc<u32>) -> bool {
+    false
+}
+
+pub fn inner_types(_m: &MyAtomic) -> bool {
+    true
+}
+
+static mut COUNTER: usize = 0;
+
+/// # Safety
+///
+/// Don't ever call this from multiple threads
+pub unsafe fn mutates_static() -> usize {
+    COUNTER += 1;
+    COUNTER
+}
+
+#[no_mangle]
+pub fn unmangled(i: bool) -> bool {
+    !i
+}
+
+fn main() {
+    assert_eq!(1, pure(1));
+}