rust-lang · cyrgani · Mar 21, 2026
diff --git a/src/tools/compiletest/src/runtest.rs b/src/tools/compiletest/src/runtest.rs
@@ -1919,8 +1919,15 @@ impl<'test> TestCx<'test> {
             compiler.args(&["-A", "unused", "-W", "unused_attributes"]);
         }
 
-        // Allow tests to use internal features.
+        // Allow tests to use internal and incomplete features.
         compiler.args(&["-A", "internal_features"]);
+        // FIXME(#154168); temporarily exclude some directories to make the transition easier
+        if !input_file
+            .iter()
+            .any(|p| p == "traits" || p == "specialization" || p == "const-generics")
+        {
+            compiler.args(&["-A", "incomplete_features"]);
+        }
 
         // Allow tests to have unused parens and braces.
         // Add #![deny(unused_parens, unused_braces)] to the test file if you want to

diff --git a/tests/ui/associated-consts/type-const-in-array-len-wrong-type.rs b/tests/ui/associated-consts/type-const-in-array-len-wrong-type.rs
@@ -1,9 +1,6 @@
 #![feature(generic_const_exprs)]
-//~^ WARN the feature `generic_const_exprs` is incomplete
 #![feature(min_generic_const_args)]
-//~^ WARN the feature `min_generic_const_args` is incomplete
 #![feature(inherent_associated_types)]
-//~^ WARN the feature `inherent_associated_types` is incomplete
 
 struct OnDiskDirEntry<'a>(&'a ());
 

diff --git a/tests/ui/associated-consts/type-const-in-array-len-wrong-type.stderr b/tests/ui/associated-consts/type-const-in-array-len-wrong-type.stderr
@@ -1,35 +1,10 @@
-warning: the feature `generic_const_exprs` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/type-const-in-array-len-wrong-type.rs:1:12
-   |
-LL | #![feature(generic_const_exprs)]
-   |            ^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #76560 <https://github.com/rust-lang/rust/issues/76560> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
-warning: the feature `min_generic_const_args` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/type-const-in-array-len-wrong-type.rs:3:12
-   |
-LL | #![feature(min_generic_const_args)]
-   |            ^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #132980 <https://github.com/rust-lang/rust/issues/132980> for more information
-
-warning: the feature `inherent_associated_types` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/type-const-in-array-len-wrong-type.rs:5:12
-   |
-LL | #![feature(inherent_associated_types)]
-   |            ^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #8995 <https://github.com/rust-lang/rust/issues/8995> for more information
-
 error: the constant `2` is not of type `usize`
-  --> $DIR/type-const-in-array-len-wrong-type.rs:13:26
+  --> $DIR/type-const-in-array-len-wrong-type.rs:10:26
    |
 LL |     fn lfn_contents() -> [char; Self::LFN_FRAGMENT_LEN] {
    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `usize`, found `i64`
    |
    = note: the length of array `[char; 2]` must be type `usize`
 
-error: aborting due to 1 previous error; 3 warnings emitted
+error: aborting due to 1 previous error
 
diff --git a/tests/ui/associated-consts/type-const-in-array-len.rs b/tests/ui/associated-consts/type-const-in-array-len.rs
@@ -1,9 +1,7 @@
 //@ check-pass
 
 #![feature(min_generic_const_args)]
-//~^ WARN the feature `min_generic_const_args` is incomplete
 #![feature(inherent_associated_types)]
-//~^ WARN the feature `inherent_associated_types` is incomplete
 
 // Test case from #138226: generic impl with multiple type parameters
 struct Foo<A, B>(A, B);

diff --git a/tests/ui/associated-consts/type-const-in-array-len.stderr b/tests/ui/associated-consts/type-const-in-array-len.stderr
diff --git a/tests/ui/associated-inherent-types/hr-do-not-blame-outlives-static-ice.rs b/tests/ui/associated-inherent-types/hr-do-not-blame-outlives-static-ice.rs
@@ -2,7 +2,6 @@
 
 // Regression test for #146467.
 #![feature(inherent_associated_types)]
-//~^ WARN the feature `inherent_associated_types` is incomplete
 
 struct Foo<T>(T);
 

diff --git a/tests/ui/associated-inherent-types/hr-do-not-blame-outlives-static-ice.stderr b/tests/ui/associated-inherent-types/hr-do-not-blame-outlives-static-ice.stderr
@@ -1,20 +1,11 @@
-warning: the feature `inherent_associated_types` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/hr-do-not-blame-outlives-static-ice.rs:4:12
-   |
-LL | #![feature(inherent_associated_types)]
-   |            ^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #8995 <https://github.com/rust-lang/rust/issues/8995> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error[E0207]: the lifetime parameter `'a` is not constrained by the impl trait, self type, or predicates
-  --> $DIR/hr-do-not-blame-outlives-static-ice.rs:9:6
+  --> $DIR/hr-do-not-blame-outlives-static-ice.rs:8:6
    |
 LL | impl<'a> Foo<fn(&())> {
    |      ^^ unconstrained lifetime parameter
 
 error[E0308]: mismatched types
-  --> $DIR/hr-do-not-blame-outlives-static-ice.rs:14:11
+  --> $DIR/hr-do-not-blame-outlives-static-ice.rs:13:11
    |
 LL | fn foo(_: for<'a> fn(Foo<fn(&'a ())>::Assoc)) {}
    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ one type is more general than the other
@@ -23,12 +14,12 @@ LL | fn foo(_: for<'a> fn(Foo<fn(&'a ())>::Assoc)) {}
               found struct `Foo<for<'a> fn(&'a ())>`
 
 error: higher-ranked subtype error
-  --> $DIR/hr-do-not-blame-outlives-static-ice.rs:14:1
+  --> $DIR/hr-do-not-blame-outlives-static-ice.rs:13:1
    |
 LL | fn foo(_: for<'a> fn(Foo<fn(&'a ())>::Assoc)) {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: aborting due to 3 previous errors; 1 warning emitted
+error: aborting due to 3 previous errors
 
 Some errors have detailed explanations: E0207, E0308.
 For more information about an error, try `rustc --explain E0207`.
diff --git a/tests/ui/associated-inherent-types/variance-computation-requires-equality.rs b/tests/ui/associated-inherent-types/variance-computation-requires-equality.rs
@@ -1,7 +1,6 @@
 //@ check-pass
 
 #![feature(inherent_associated_types)]
-//~^ WARN the feature `inherent_associated_types` is incomplete
 
 struct D<T> {
   a: T

diff --git a/tests/ui/associated-inherent-types/variance-computation-requires-equality.stderr b/tests/ui/associated-inherent-types/variance-computation-requires-equality.stderr
diff --git a/tests/ui/associated-types/defaults-specialization.rs b/tests/ui/associated-types/defaults-specialization.rs
@@ -1,7 +1,6 @@
 //! Tests the interaction of associated type defaults and specialization.
 
 #![feature(associated_type_defaults, specialization)]
-//~^ WARN the feature `specialization` is incomplete
 
 trait Tr {
     type Ty = u8;

diff --git a/tests/ui/associated-types/defaults-specialization.stderr b/tests/ui/associated-types/defaults-specialization.stderr
@@ -1,21 +1,11 @@
-warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/defaults-specialization.rs:3:38
-   |
-LL | #![feature(associated_type_defaults, specialization)]
-   |                                      ^^^^^^^^^^^^^^
-   |
-   = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
-   = help: consider using `min_specialization` instead, which is more stable and complete
-   = note: `#[warn(incomplete_features)]` on by default
-
 error[E0053]: method `make` has an incompatible type for trait
-  --> $DIR/defaults-specialization.rs:19:18
+  --> $DIR/defaults-specialization.rs:18:18
    |
 LL |     fn make() -> u8 { 0 }
    |                  ^^ expected associated type, found `u8`
    |
 note: type in trait
-  --> $DIR/defaults-specialization.rs:9:18
+  --> $DIR/defaults-specialization.rs:8:18
    |
 LL |     fn make() -> Self::Ty {
    |                  ^^^^^^^^
@@ -28,7 +18,7 @@ LL +     fn make() -> <A<T> as Tr>::Ty { 0 }
    |
 
 error[E0053]: method `make` has an incompatible type for trait
-  --> $DIR/defaults-specialization.rs:35:18
+  --> $DIR/defaults-specialization.rs:34:18
    |
 LL |     default type Ty = bool;
    |     --------------- associated type is `default` and may be overridden
@@ -37,7 +27,7 @@ LL |     fn make() -> bool { true }
    |                  ^^^^ expected associated type, found `bool`
    |
 note: type in trait
-  --> $DIR/defaults-specialization.rs:9:18
+  --> $DIR/defaults-specialization.rs:8:18
    |
 LL |     fn make() -> Self::Ty {
    |                  ^^^^^^^^
@@ -50,7 +40,7 @@ LL +     fn make() -> <B<T> as Tr>::Ty { true }
    |
 
 error[E0308]: mismatched types
-  --> $DIR/defaults-specialization.rs:10:9
+  --> $DIR/defaults-specialization.rs:9:9
    |
 LL |     type Ty = u8;
    |     ------- associated type defaults can't be assumed inside the trait defining them
@@ -64,7 +54,7 @@ LL |         0u8
                          found type `u8`
 
 error[E0308]: mismatched types
-  --> $DIR/defaults-specialization.rs:26:29
+  --> $DIR/defaults-specialization.rs:25:29
    |
 LL |     fn make() -> Self::Ty { 0u8 }
    |                  --------   ^^^ expected associated type, found `u8`
@@ -79,7 +69,7 @@ LL |     fn make() -> Self::Ty { 0u8 }
            see issue #152409 <https://github.com/rust-lang/rust/issues/152409> for more information
 
 error[E0308]: mismatched types
-  --> $DIR/defaults-specialization.rs:44:29
+  --> $DIR/defaults-specialization.rs:43:29
    |
 LL |     default type Ty = bool;
    |     --------------- associated type is `default` and may be overridden
@@ -95,7 +85,7 @@ LL |     fn make() -> Self::Ty { true }
            see issue #152409 <https://github.com/rust-lang/rust/issues/152409> for more information
 
 error[E0308]: mismatched types
-  --> $DIR/defaults-specialization.rs:87:32
+  --> $DIR/defaults-specialization.rs:86:32
    |
 LL |     let _: <B<()> as Tr>::Ty = 0u8;
    |            -----------------   ^^^ expected associated type, found `u8`
@@ -105,13 +95,13 @@ LL |     let _: <B<()> as Tr>::Ty = 0u8;
    = note: expected associated type `<B<()> as Tr>::Ty`
                          found type `u8`
 help: a method is available that returns `<B<()> as Tr>::Ty`
-  --> $DIR/defaults-specialization.rs:9:5
+  --> $DIR/defaults-specialization.rs:8:5
    |
 LL |     fn make() -> Self::Ty {
    |     ^^^^^^^^^^^^^^^^^^^^^ consider calling `Tr::make`
 
 error[E0308]: mismatched types
-  --> $DIR/defaults-specialization.rs:88:32
+  --> $DIR/defaults-specialization.rs:87:32
    |
 LL |     let _: <B<()> as Tr>::Ty = true;
    |            -----------------   ^^^^ expected associated type, found `bool`
@@ -121,15 +111,15 @@ LL |     let _: <B<()> as Tr>::Ty = true;
    = note: expected associated type `<B<()> as Tr>::Ty`
                          found type `bool`
 help: a method is available that returns `<B<()> as Tr>::Ty`
-  --> $DIR/defaults-specialization.rs:9:5
+  --> $DIR/defaults-specialization.rs:8:5
    |
 LL |     fn make() -> Self::Ty {
    |     ^^^^^^^^^^^^^^^^^^^^^ consider calling `Tr::make`
    = note: the associated type `<B<()> as Tr>::Ty` is defined as `bool` in the implementation, but the where-bound `B<()>` shadows this definition
            see issue #152409 <https://github.com/rust-lang/rust/issues/152409> for more information
 
 error[E0308]: mismatched types
-  --> $DIR/defaults-specialization.rs:89:33
+  --> $DIR/defaults-specialization.rs:88:33
    |
 LL |     let _: <B2<()> as Tr>::Ty = 0u8;
    |            ------------------   ^^^ expected associated type, found `u8`
@@ -139,13 +129,13 @@ LL |     let _: <B2<()> as Tr>::Ty = 0u8;
    = note: expected associated type `<B2<()> as Tr>::Ty`
                          found type `u8`
 help: a method is available that returns `<B2<()> as Tr>::Ty`
-  --> $DIR/defaults-specialization.rs:9:5
+  --> $DIR/defaults-specialization.rs:8:5
    |
 LL |     fn make() -> Self::Ty {
    |     ^^^^^^^^^^^^^^^^^^^^^ consider calling `Tr::make`
 
 error[E0308]: mismatched types
-  --> $DIR/defaults-specialization.rs:90:33
+  --> $DIR/defaults-specialization.rs:89:33
    |
 LL |     let _: <B2<()> as Tr>::Ty = true;
    |            ------------------   ^^^^ expected associated type, found `bool`
@@ -155,14 +145,14 @@ LL |     let _: <B2<()> as Tr>::Ty = true;
    = note: expected associated type `<B2<()> as Tr>::Ty`
                          found type `bool`
 help: a method is available that returns `<B2<()> as Tr>::Ty`
-  --> $DIR/defaults-specialization.rs:9:5
+  --> $DIR/defaults-specialization.rs:8:5
    |
 LL |     fn make() -> Self::Ty {
    |     ^^^^^^^^^^^^^^^^^^^^^ consider calling `Tr::make`
    = note: the associated type `<B2<()> as Tr>::Ty` is defined as `bool` in the implementation, but the where-bound `B2<()>` shadows this definition
            see issue #152409 <https://github.com/rust-lang/rust/issues/152409> for more information
 
-error: aborting due to 9 previous errors; 1 warning emitted
+error: aborting due to 9 previous errors
 
 Some errors have detailed explanations: E0053, E0308.
 For more information about an error, try `rustc --explain E0053`.
diff --git a/tests/ui/async-await/async-drop/foreign-fundamental.rs b/tests/ui/async-await/async-drop/foreign-fundamental.rs
@@ -1,7 +1,6 @@
 //@ edition: 2018
 
 #![feature(async_drop)]
-//~^ WARN the feature `async_drop` is incomplete
 
 use std::future::AsyncDrop;
 use std::pin::Pin;

diff --git a/tests/ui/async-await/async-drop/foreign-fundamental.stderr b/tests/ui/async-await/async-drop/foreign-fundamental.stderr
@@ -1,24 +1,15 @@
-warning: the feature `async_drop` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/foreign-fundamental.rs:3:12
-   |
-LL | #![feature(async_drop)]
-   |            ^^^^^^^^^^
-   |
-   = note: see issue #126482 <https://github.com/rust-lang/rust/issues/126482> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error[E0120]: the `AsyncDrop` trait may only be implemented for local structs, enums, and unions
-  --> $DIR/foreign-fundamental.rs:11:20
+  --> $DIR/foreign-fundamental.rs:10:20
    |
 LL | impl AsyncDrop for &Foo {
    |                    ^^^^ must be a struct, enum, or union in the current crate
 
 error[E0120]: the `AsyncDrop` trait may only be implemented for local structs, enums, and unions
-  --> $DIR/foreign-fundamental.rs:16:20
+  --> $DIR/foreign-fundamental.rs:15:20
    |
 LL | impl AsyncDrop for Pin<Foo> {
    |                    ^^^^^^^^ must be a struct, enum, or union in the current crate
 
-error: aborting due to 2 previous errors; 1 warning emitted
+error: aborting due to 2 previous errors
 
 For more information about this error, try `rustc --explain E0120`.
diff --git a/tests/ui/async-await/dyn/mut-is-pointer-like.stderr b/tests/ui/async-await/dyn/mut-is-pointer-like.stderr
@@ -1,12 +1,3 @@
-warning: the feature `async_fn_in_dyn_trait` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/mut-is-pointer-like.rs:6:12
-   |
-LL | #![feature(async_fn_in_dyn_trait)]
-   |            ^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #133119 <https://github.com/rust-lang/rust/issues/133119> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error[E0038]: the trait `AsyncTrait` is not dyn compatible
   --> $DIR/mut-is-pointer-like.rs:35:29
    |
@@ -24,6 +15,6 @@ LL |     async fn async_dispatch(self: Pin<&mut Self>) -> Self::Output;
    |              ^^^^^^^^^^^^^^ ...because method `async_dispatch` is `async`
    = help: consider moving `async_dispatch` to another trait
 
-error: aborting due to 1 previous error; 1 warning emitted
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0038`.
diff --git a/tests/ui/async-await/dyn/works.stderr b/tests/ui/async-await/dyn/works.stderr
@@ -1,12 +1,3 @@
-warning: the feature `async_fn_in_dyn_trait` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/works.rs:6:12
-   |
-LL | #![feature(async_fn_in_dyn_trait)]
-   |            ^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #133119 <https://github.com/rust-lang/rust/issues/133119> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error[E0038]: the trait `AsyncTrait` is not dyn compatible
   --> $DIR/works.rs:27:21
    |
@@ -24,6 +15,6 @@ LL |     async fn async_dispatch(&self);
    = help: consider moving `async_dispatch` to another trait
    = help: only type `&'static str` implements `AsyncTrait`; consider using it directly instead.
 
-error: aborting due to 1 previous error; 1 warning emitted
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0038`.