minor test improvements

Author: WaffleLapkin

tests/ui/never_type/call-fn-never-arg.rs

@@ -3,7 +3,7 @@
 //@ check-pass
 
 #![feature(never_type)]
-#![allow(unreachable_code)]
+#![expect(unreachable_code)]
 
 fn foo(x: !) -> ! {
     x

tests/ui/never_type/exhaustive_patterns.rs

@@ -3,7 +3,7 @@
 //
 //@ check-fail
 
-#![feature(exhaustive_patterns, never_type)]
+#![feature(never_type)]
 
 mod inner {
     pub struct Wrapper<T>(T);

tests/ui/never_type/impl-for-never.rs

@@ -1,6 +1,7 @@
 // Test that we can call static methods on ! both directly and when it appears in a generic
 //
 //@ run-pass
+//@ check-run-results
 
 #![feature(never_type)]
 

tests/ui/never_type/impl-for-never.run.stdout

@@ -0,0 +1,2 @@
+! is !
+None is none

tests/ui/never_type/never-assign-dead-code.rs

@@ -3,7 +3,7 @@
 //@ check-pass
 
 #![feature(never_type)]
-#![allow(dropping_copy_types)]
+#![expect(dropping_copy_types)]
 #![warn(unused)]
 
 fn main() {

tests/ui/never_type/never-assign-wrong-type.rs

@@ -1,7 +1,6 @@
 // Test that we can't use another type in place of !
 
 #![feature(never_type)]
-#![deny(warnings)]
 
 fn main() {
     let x: ! = "hello"; //~ ERROR mismatched types

tests/ui/never_type/never-assign-wrong-type.stderr

@@ -1,5 +1,5 @@
 error[E0308]: mismatched types
-  --> $DIR/never-assign-wrong-type.rs:7:16
+  --> $DIR/never-assign-wrong-type.rs:6:16
    |
 LL |     let x: ! = "hello";
    |            -   ^^^^^^^ expected `!`, found `&str`

tests/ui/never_type/never-result.rs

@@ -3,11 +3,9 @@
 //
 //@ run-pass
 
-#![allow(unused_variables)]
-#![allow(unreachable_code)]
-#![allow(unreachable_patterns)]
-// Test that we can extract a ! through pattern matching then use it as several different types.
 #![feature(never_type)]
+#![expect(unused_variables)]
+#![expect(unreachable_code)]
 
 fn main() {
     let x: Result<u32, !> = Ok(123);

tests/ui/never_type/never_transmute_never.rs

@@ -2,8 +2,8 @@
 
 #![feature(never_type)]
 #![allow(dead_code)]
-#![allow(unreachable_code)]
-#![allow(unused_variables)]
+#![expect(unreachable_code)]
+#![expect(unused_variables)]
 
 struct Foo;