ptr-coercion-rpass

Author: Kivooeo

tests/ui/coercion/basic-ptr-coercions.rs

@@ -1,29 +1,28 @@
-//@ run-pass
-
-#![allow(unused_variables)]
-// Test coercions between pointers which don't do anything fancy like unsizing.
+//! Tests basic pointer coercions between:
+//! - `&mut T` -> `&T`
+//! - `&T` -> `*const T`
+//! - `&mut T` -> `*const T`
+//! - `*mut T` -> `*const T`
 
+//@ run-pass
 
 pub fn main() {
     // &mut -> &
     let x: &mut isize = &mut 42;
-    let x: &isize = x;
-
-    let x: &isize = &mut 42;
+    let _: &isize = x;
+    let _: &isize = &mut 42;
 
     // & -> *const
     let x: &isize = &42;
-    let x: *const isize = x;
-
-    let x: *const isize = &42;
+    let _: *const isize = x;
+    let _: *const isize = &42;
 
     // &mut -> *const
     let x: &mut isize = &mut 42;
-    let x: *const isize = x;
-
-    let x: *const isize = &mut 42;
+    let _: *const isize = x;
+    let _: *const isize = &mut 42;
 
     // *mut -> *const
-    let x: *mut isize = &mut 42;
-    let x: *const isize = x;
+    let _: *mut isize = &mut 42;
+    let _: *const isize = x;
 }