Rollup merge of #149736 - dawidl022:contracts/chore/cleanup-warning-in-tests, r=Kivooeo,jieyouxu

contracts: clean up feature flag warning duplicated across tests

There is no need for every contracts test to assert the same warning for using the `contracts` feature flag, as such use `#![expect(incomplete_features)]` in the tests, and add one test to specifically check for the warning.

Making this change has been discussed in the comments of #149722.

Contracts tracking issue: #128044

r? Kivooeo

Author: Zalathar

tests/ui/contracts/associated-item.rs

@@ -3,8 +3,8 @@
 //@ compile-flags: --crate-type=lib
 //@ check-pass
 
+#![expect(incomplete_features)]
 #![feature(contracts)]
-//~^ WARN the feature `contracts` is incomplete and may not be safe to use
 
 extern crate core;
 

tests/ui/contracts/async-fn-contract-ice-145333.rs

@@ -1,7 +1,7 @@
 //@ compile-flags: --crate-type=lib
 //@ edition: 2021
+#![expect(incomplete_features)]
 #![feature(contracts)]
-//~^ WARN the feature `contracts` is incomplete
 
 #[core::contracts::ensures(|ret| *ret)]
 //~^ ERROR contract annotations are not yet supported on async or gen functions

tests/ui/contracts/async-fn-contract-ice-145333.stderr

@@ -4,14 +4,5 @@ error: contract annotations are not yet supported on async or gen functions
 LL | #[core::contracts::ensures(|ret| *ret)]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-warning: the feature `contracts` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/async-fn-contract-ice-145333.rs:3:12
-   |
-LL | #![feature(contracts)]
-   |            ^^^^^^^^^
-   |
-   = note: see issue #128044 <https://github.com/rust-lang/rust/issues/128044> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-error: aborting due to 1 previous error; 1 warning emitted
+error: aborting due to 1 previous error
 

tests/ui/contracts/contract-annotation-limitations.rs

@@ -1,8 +1,8 @@
 //! Test for some of the existing limitations and the current error messages.
 //! Some of these limitations may be removed in the future.
 
+#![expect(incomplete_features)]
 #![feature(contracts)]
-//~^ WARN the feature `contracts` is incomplete and may not be safe to use and/or cause compiler crashes [incomplete_features]
 #![allow(dead_code)]
 
 /// Represent a 5-star system.

tests/ui/contracts/contract-annotation-limitations.stderr

@@ -10,14 +10,5 @@ error: contract annotations is only supported in functions with bodies
 LL |     #[core::contracts::ensures(|ret| ret.is_none_or(Stars::is_valid))]
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-warning: the feature `contracts` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/contract-annotation-limitations.rs:4:12
-   |
-LL | #![feature(contracts)]
-   |            ^^^^^^^^^
-   |
-   = note: see issue #128044 <https://github.com/rust-lang/rust/issues/128044> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-error: aborting due to 2 previous errors; 1 warning emitted
+error: aborting due to 2 previous errors
 

tests/ui/contracts/contract-attributes-generics.chk_const_fail.stderr

@@ -16,8 +16,8 @@
 //@ [chk_fail_post] compile-flags: -Zcontract-checks=yes
 //@ [chk_const_fail] compile-flags: -Zcontract-checks=yes
 
+#![expect(incomplete_features)]
 #![feature(contracts)]
-//~^ WARN the feature `contracts` is incomplete and may not be safe to use and/or cause compiler crashes [incomplete_features]
 
 use std::ops::Sub;