Rollup merge of #32761 - tshepang:assert, r=steveklabnik

avoid "==" in assert! when one of the values is a bool

Is suspect this is something of an idiom

src/test/run-pass/specialization/specialization-cross-crate-defaults.rs

@@ -26,12 +26,12 @@ impl Foo for LocalOverride {
 }
 
 fn test_foo() {
-    assert!(0i8.foo() == false);
-    assert!(0i32.foo() == false);
-    assert!(0i64.foo() == true);
+    assert!(!0i8.foo());
+    assert!(!0i32.foo());
+    assert!(0i64.foo());
 
-    assert!(LocalDefault.foo() == false);
-    assert!(LocalOverride.foo() == true);
+    assert!(!LocalDefault.foo());
+    assert!(LocalOverride.foo());
 }
 
 fn test_bar() {

src/test/run-pass/specialization/specialization-default-methods.rs

@@ -35,9 +35,9 @@ impl Foo for i64 {
 }
 
 fn test_foo() {
-    assert!(0i8.foo() == false);
-    assert!(0i32.foo() == false);
-    assert!(0i64.foo() == true);
+    assert!(!0i8.foo());
+    assert!(!0i32.foo());
+    assert!(0i64.foo());
 }
 
 // Next, test mixture of explicit `default` and provided methods: