Update upstream source from tag 'upstream/1.52.1+dfsg1'

[rustc.git] / src / tools / clippy / tests / ui / unused_self.rs

diff --git a/src/tools/clippy/tests/ui/unused_self.rs b/src/tools/clippy/tests/ui/unused_self.rs
new file mode 100644 (file)
index 0000000..7a4bbdd
--- /dev/null
+++ b/src/tools/clippy/tests/ui/unused_self.rs
@@ -0,0 +1,140 @@
+#![warn(clippy::unused_self)]
+#![allow(clippy::boxed_local, clippy::fn_params_excessive_bools)]
+
+mod unused_self {
+    use std::pin::Pin;
+    use std::sync::{Arc, Mutex};
+
+    struct A {}
+
+    impl A {
+        fn unused_self_move(self) {}
+        fn unused_self_ref(&self) {}
+        fn unused_self_mut_ref(&mut self) {}
+        fn unused_self_pin_ref(self: Pin<&Self>) {}
+        fn unused_self_pin_mut_ref(self: Pin<&mut Self>) {}
+        fn unused_self_pin_nested(self: Pin<Arc<Self>>) {}
+        fn unused_self_box(self: Box<Self>) {}
+        fn unused_with_other_used_args(&self, x: u8, y: u8) -> u8 {
+            x + y
+        }
+        fn unused_self_class_method(&self) {
+            Self::static_method();
+        }
+
+        fn static_method() {}
+    }
+}
+
+mod unused_self_allow {
+    struct A {}
+
+    impl A {
+        // shouldn't trigger
+        #[allow(clippy::unused_self)]
+        fn unused_self_move(self) {}
+    }
+
+    struct B {}
+
+    // shouldn't trigger
+    #[allow(clippy::unused_self)]
+    impl B {
+        fn unused_self_move(self) {}
+    }
+
+    struct C {}
+
+    #[allow(clippy::unused_self)]
+    impl C {
+        #[warn(clippy::unused_self)]
+        fn some_fn((): ()) {}
+
+        // shouldn't trigger
+        fn unused_self_move(self) {}
+    }
+}
+
+mod used_self {
+    use std::pin::Pin;
+
+    struct A {
+        x: u8,
+    }
+
+    impl A {
+        fn used_self_move(self) -> u8 {
+            self.x
+        }
+        fn used_self_ref(&self) -> u8 {
+            self.x
+        }
+        fn used_self_mut_ref(&mut self) {
+            self.x += 1
+        }
+        fn used_self_pin_ref(self: Pin<&Self>) -> u8 {
+            self.x
+        }
+        fn used_self_box(self: Box<Self>) -> u8 {
+            self.x
+        }
+        fn used_self_with_other_unused_args(&self, x: u8, y: u8) -> u8 {
+            self.x
+        }
+        fn used_in_nested_closure(&self) -> u8 {
+            let mut a = || -> u8 { self.x };
+            a()
+        }
+
+        #[allow(clippy::collapsible_if)]
+        fn used_self_method_nested_conditions(&self, a: bool, b: bool, c: bool, d: bool) {
+            if a {
+                if b {
+                    if c {
+                        if d {
+                            self.used_self_ref();
+                        }
+                    }
+                }
+            }
+        }
+
+        fn foo(&self) -> u32 {
+            let mut sum = 0u32;
+            for i in 0..self.x {
+                sum += i as u32;
+            }
+            sum
+        }
+
+        fn bar(&mut self, x: u8) -> u32 {
+            let mut y = 0u32;
+            for i in 0..x {
+                y += self.foo()
+            }
+            y
+        }
+    }
+}
+
+mod not_applicable {
+    use std::fmt;
+
+    struct A {}
+
+    impl fmt::Debug for A {
+        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+            write!(f, "A")
+        }
+    }
+
+    impl A {
+        fn method(x: u8, y: u8) {}
+    }
+
+    trait B {
+        fn method(&self) {}
+    }
+}
+
+fn main() {}