Suggest minimal subset features in `incomplete_features` lint

87 files changed, 87 insertions, 0 deletions

diff --git a/src/test/ui/array-slice-vec/match_arr_unknown_len.stderr b/src/test/ui/array-slice-vec/match_arr_unknown_len.stderr
index 0ad05b3adeb..7c1a92c79d9 100644
--- a/src/test/ui/array-slice-vec/match_arr_unknown_len.stderr
+++ b/src/test/ui/array-slice-vec/match_arr_unknown_len.stderr
@@ -6,6 +6,7 @@ LL | #![feature(const_generics)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+   = help: consider using `min_const_generics` instead, which is more stable and complete
 
 error[E0308]: mismatched types
   --> $DIR/match_arr_unknown_len.rs:6:9
diff --git a/src/test/ui/associated-types/defaults-specialization.stderr b/src/test/ui/associated-types/defaults-specialization.stderr
index 09a8c8f8a88..920f8322813 100644
--- a/src/test/ui/associated-types/defaults-specialization.stderr
+++ b/src/test/ui/associated-types/defaults-specialization.stderr
@@ -6,6 +6,7 @@ LL | #![feature(associated_type_defaults, specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0053]: method `make` has an incompatible type for trait
   --> $DIR/defaults-specialization.rs:19:18
diff --git a/src/test/ui/binding/const-param.stderr b/src/test/ui/binding/const-param.stderr
index 316fac62325..d3d06a2d834 100644
--- a/src/test/ui/binding/const-param.stderr
+++ b/src/test/ui/binding/const-param.stderr
@@ -6,6 +6,7 @@ LL | #![feature(const_generics)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+   = help: consider using `min_const_generics` instead, which is more stable and complete
 
 error[E0158]: const parameters cannot be referenced in patterns
   --> $DIR/const-param.rs:7:9
diff --git a/src/test/ui/coherence/coherence-inherited-assoc-ty-cycle-err.stderr b/src/test/ui/coherence/coherence-inherited-assoc-ty-cycle-err.stderr
index 7e140480b77..f3edf1c350f 100644
--- a/src/test/ui/coherence/coherence-inherited-assoc-ty-cycle-err.stderr
+++ b/src/test/ui/coherence/coherence-inherited-assoc-ty-cycle-err.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0391]: cycle detected when building specialization graph of trait `Trait`
   --> $DIR/coherence-inherited-assoc-ty-cycle-err.rs:9:1
diff --git a/src/test/ui/const-generics/defaults/wrong-order.full.stderr b/src/test/ui/const-generics/defaults/wrong-order.full.stderr
index c51028d5b20..99f46309bf6 100644
--- a/src/test/ui/const-generics/defaults/wrong-order.full.stderr
+++ b/src/test/ui/const-generics/defaults/wrong-order.full.stderr
@@ -14,6 +14,7 @@ LL | #![cfg_attr(full, feature(const_generics))]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+   = help: consider using `min_const_generics` instead, which is more stable and complete
 
 error: aborting due to previous error; 1 warning emitted
 
diff --git a/src/test/ui/const-generics/issues/issue-56445.full.stderr b/src/test/ui/const-generics/issues/issue-56445.full.stderr
index d853ec5015e..50e91418551 100644
--- a/src/test/ui/const-generics/issues/issue-56445.full.stderr
+++ b/src/test/ui/const-generics/issues/issue-56445.full.stderr
@@ -6,6 +6,7 @@ LL | #![cfg_attr(full, feature(const_generics))]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+   = help: consider using `min_const_generics` instead, which is more stable and complete
 
 error[E0771]: use of non-static lifetime `'a` in const generic
   --> $DIR/issue-56445.rs:9:26
diff --git a/src/test/ui/const-generics/issues/issue-60818-struct-constructors.full.stderr b/src/test/ui/const-generics/issues/issue-60818-struct-constructors.full.stderr
index c03b7252a3c..cc014ea429d 100644
--- a/src/test/ui/const-generics/issues/issue-60818-struct-constructors.full.stderr
+++ b/src/test/ui/const-generics/issues/issue-60818-struct-constructors.full.stderr
@@ -6,6 +6,7 @@ LL | #![cfg_attr(full, feature(const_generics))]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+   = help: consider using `min_const_generics` instead, which is more stable and complete
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/const-generics/issues/issue-61336-1.full.stderr b/src/test/ui/const-generics/issues/issue-61336-1.full.stderr
index f18728eabbb..3a9f819a626 100644
--- a/src/test/ui/const-generics/issues/issue-61336-1.full.stderr
+++ b/src/test/ui/const-generics/issues/issue-61336-1.full.stderr
@@ -6,6 +6,7 @@ LL | #![cfg_attr(full, feature(const_generics))]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+   = help: consider using `min_const_generics` instead, which is more stable and complete
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/const-generics/issues/issue-61336-2.full.stderr b/src/test/ui/const-generics/issues/issue-61336-2.full.stderr
index ef6e60084a5..883ebbef3e8 100644
--- a/src/test/ui/const-generics/issues/issue-61336-2.full.stderr
+++ b/src/test/ui/const-generics/issues/issue-61336-2.full.stderr
@@ -6,6 +6,7 @@ LL | #![cfg_attr(full, feature(const_generics))]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+   = help: consider using `min_const_generics` instead, which is more stable and complete
 
 error[E0277]: the trait bound `T: Copy` is not satisfied
   --> $DIR/issue-61336-2.rs:10:5
diff --git a/src/test/ui/const-generics/issues/issue-61336.full.stderr b/src/test/ui/const-generics/issues/issue-61336.full.stderr
index bdfdffd941d..3863da8da05 100644
--- a/src/test/ui/const-generics/issues/issue-61336.full.stderr
+++ b/src/test/ui/const-generics/issues/issue-61336.full.stderr
@@ -6,6 +6,7 @@ LL | #![cfg_attr(full, feature(const_generics))]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+   = help: consider using `min_const_generics` instead, which is more stable and complete
 
 error[E0277]: the trait bound `T: Copy` is not satisfied
   --> $DIR/issue-61336.rs:10:5
diff --git a/src/test/ui/const-generics/issues/issue-61422.full.stderr b/src/test/ui/const-generics/issues/issue-61422.full.stderr
index ac6c378295d..294378a6690 100644
--- a/src/test/ui/const-generics/issues/issue-61422.full.stderr
+++ b/src/test/ui/const-generics/issues/issue-61422.full.stderr
@@ -6,6 +6,7 @@ LL | #![cfg_attr(full, feature(const_generics))]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+   = help: consider using `min_const_generics` instead, which is more stable and complete
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/const-generics/issues/issue-61432.full.stderr b/src/test/ui/const-generics/issues/issue-61432.full.stderr
index 82b36de45a2..eec1b20254e 100644
--- a/src/test/ui/const-generics/issues/issue-61432.full.stderr
+++ b/src/test/ui/const-generics/issues/issue-61432.full.stderr
@@ -6,6 +6,7 @@ LL | #![cfg_attr(full, feature(const_generics))]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+   = help: consider using `min_const_generics` instead, which is more stable and complete
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/const-generics/issues/issue-61747.full.stderr b/src/test/ui/const-generics/issues/issue-61747.full.stderr
index 3ccce5675fc..3a266c8e974 100644
--- a/src/test/ui/const-generics/issues/issue-61747.full.stderr
+++ b/src/test/ui/const-generics/issues/issue-61747.full.stderr
@@ -6,6 +6,7 @@ LL | #![cfg_attr(full, feature(const_generics))]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+   = help: consider using `min_const_generics` instead, which is more stable and complete
 
 error: constant expression depends on a generic parameter
   --> $DIR/issue-61747.rs:8:23
diff --git a/src/test/ui/const-generics/occurs-check/unify-fixpoint.stderr b/src/test/ui/const-generics/occurs-check/unify-fixpoint.stderr
index 671f1103dcc..8a1462c59e8 100644
--- a/src/test/ui/const-generics/occurs-check/unify-fixpoint.stderr
+++ b/src/test/ui/const-generics/occurs-check/unify-fixpoint.stderr
@@ -6,6 +6,7 @@ LL | #![feature(const_generics)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+   = help: consider using `min_const_generics` instead, which is more stable and complete
 
 error: constant expression depends on a generic parameter
   --> $DIR/unify-fixpoint.rs:9:32
diff --git a/src/test/ui/consts/trait_specialization.stderr b/src/test/ui/consts/trait_specialization.stderr
index 03da7d512e5..e80821cf46a 100644
--- a/src/test/ui/consts/trait_specialization.stderr
+++ b/src/test/ui/consts/trait_specialization.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/error-codes/E0520.stderr b/src/test/ui/error-codes/E0520.stderr
index 1041ccee937..be7b95465a5 100644
--- a/src/test/ui/error-codes/E0520.stderr
+++ b/src/test/ui/error-codes/E0520.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0520]: `fly` specializes an item from a parent `impl`, but that item is not marked `default`
   --> $DIR/E0520.rs:17:5
diff --git a/src/test/ui/error-codes/E0730.stderr b/src/test/ui/error-codes/E0730.stderr
index f915f6edef5..356e4f36042 100644
--- a/src/test/ui/error-codes/E0730.stderr
+++ b/src/test/ui/error-codes/E0730.stderr
@@ -6,6 +6,7 @@ LL | #![feature(const_generics)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+   = help: consider using `min_const_generics` instead, which is more stable and complete
 
 error[E0730]: cannot pattern-match on an array without a fixed length
   --> $DIR/E0730.rs:6:9
diff --git a/src/test/ui/error-codes/E0771.stderr b/src/test/ui/error-codes/E0771.stderr
index 60220be6b57..b184b599817 100644
--- a/src/test/ui/error-codes/E0771.stderr
+++ b/src/test/ui/error-codes/E0771.stderr
@@ -6,6 +6,7 @@ LL | #![feature(const_generics)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+   = help: consider using `min_const_generics` instead, which is more stable and complete
 
 error[E0771]: use of non-static lifetime `'a` in const generic
   --> $DIR/E0771.rs:4:41
diff --git a/src/test/ui/hygiene/generic_params.stderr b/src/test/ui/hygiene/generic_params.stderr
index 4ca6d199835..6de36deb597 100644
--- a/src/test/ui/hygiene/generic_params.stderr
+++ b/src/test/ui/hygiene/generic_params.stderr
@@ -6,6 +6,7 @@ LL | #![feature(decl_macro, rustc_attrs, const_generics)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+   = help: consider using `min_const_generics` instead, which is more stable and complete
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/hygiene/issue-61574-const-parameters.stderr b/src/test/ui/hygiene/issue-61574-const-parameters.stderr
index b351b8b73a0..3f85383eb33 100644
--- a/src/test/ui/hygiene/issue-61574-const-parameters.stderr
+++ b/src/test/ui/hygiene/issue-61574-const-parameters.stderr
@@ -6,6 +6,7 @@ LL | #![feature(const_generics)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+   = help: consider using `min_const_generics` instead, which is more stable and complete
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/impl-trait/equality-rpass.stderr b/src/test/ui/impl-trait/equality-rpass.stderr
index 1abf05dca82..11eeceba0ee 100644
--- a/src/test/ui/impl-trait/equality-rpass.stderr
+++ b/src/test/ui/impl-trait/equality-rpass.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/impl-trait/equality.stderr b/src/test/ui/impl-trait/equality.stderr
index cdaa61ac323..536a4726c6d 100644
--- a/src/test/ui/impl-trait/equality.stderr
+++ b/src/test/ui/impl-trait/equality.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0308]: mismatched types
   --> $DIR/equality.rs:15:5
diff --git a/src/test/ui/impl-trait/equality2.stderr b/src/test/ui/impl-trait/equality2.stderr
index 1780931efc5..1443b76048b 100644
--- a/src/test/ui/impl-trait/equality2.stderr
+++ b/src/test/ui/impl-trait/equality2.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0308]: mismatched types
   --> $DIR/equality2.rs:25:18
diff --git a/src/test/ui/issues/issue-35376.stderr b/src/test/ui/issues/issue-35376.stderr
index 06c31f3bae0..835277d408e 100644
--- a/src/test/ui/issues/issue-35376.stderr
+++ b/src/test/ui/issues/issue-35376.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/issues/issue-55380.stderr b/src/test/ui/issues/issue-55380.stderr
index 451beebd106..65e94d79670 100644
--- a/src/test/ui/issues/issue-55380.stderr
+++ b/src/test/ui/issues/issue-55380.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/issues/issue-59508-1.stderr b/src/test/ui/issues/issue-59508-1.stderr
index 5e97339f148..2a4ccda8929 100644
--- a/src/test/ui/issues/issue-59508-1.stderr
+++ b/src/test/ui/issues/issue-59508-1.stderr
@@ -12,6 +12,7 @@ LL | #![feature(const_generics)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+   = help: consider using `min_const_generics` instead, which is more stable and complete
 
 error: aborting due to previous error; 1 warning emitted
 
diff --git a/src/test/ui/overlap-doesnt-conflict-with-specialization.stderr b/src/test/ui/overlap-doesnt-conflict-with-specialization.stderr
index 16df31ba2a8..fca98662708 100644
--- a/src/test/ui/overlap-doesnt-conflict-with-specialization.stderr
+++ b/src/test/ui/overlap-doesnt-conflict-with-specialization.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/parser/assoc-static-semantic-fail.stderr b/src/test/ui/parser/assoc-static-semantic-fail.stderr
index bc3054c3e30..7ae092cee67 100644
--- a/src/test/ui/parser/assoc-static-semantic-fail.stderr
+++ b/src/test/ui/parser/assoc-static-semantic-fail.stderr
@@ -170,6 +170,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error: aborting due to 24 previous errors; 1 warning emitted
 
diff --git a/src/test/ui/parser/default.stderr b/src/test/ui/parser/default.stderr
index dea35666f37..5b763ae72f5 100644
--- a/src/test/ui/parser/default.stderr
+++ b/src/test/ui/parser/default.stderr
@@ -31,6 +31,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0046]: not all trait items implemented, missing: `foo`
   --> $DIR/default.rs:22:1
diff --git a/src/test/ui/parser/trait-item-with-defaultness-fail-semantic.stderr b/src/test/ui/parser/trait-item-with-defaultness-fail-semantic.stderr
index e8ff93f6323..cdc9ee8d9e7 100644
--- a/src/test/ui/parser/trait-item-with-defaultness-fail-semantic.stderr
+++ b/src/test/ui/parser/trait-item-with-defaultness-fail-semantic.stderr
@@ -54,6 +54,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error: aborting due to 6 previous errors; 1 warning emitted
 
diff --git a/src/test/ui/polymorphization/const_parameters/closures.stderr b/src/test/ui/polymorphization/const_parameters/closures.stderr
index 266b6e62afd..63335586b76 100644
--- a/src/test/ui/polymorphization/const_parameters/closures.stderr
+++ b/src/test/ui/polymorphization/const_parameters/closures.stderr
@@ -6,6 +6,7 @@ LL | #![feature(const_generics, rustc_attrs)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+   = help: consider using `min_const_generics` instead, which is more stable and complete
 
 error: item has unused generic parameters
   --> $DIR/closures.rs:19:19
diff --git a/src/test/ui/polymorphization/const_parameters/functions.stderr b/src/test/ui/polymorphization/const_parameters/functions.stderr
index e379e32c1fc..c976a5b62aa 100644
--- a/src/test/ui/polymorphization/const_parameters/functions.stderr
+++ b/src/test/ui/polymorphization/const_parameters/functions.stderr
@@ -6,6 +6,7 @@ LL | #![feature(const_generics, rustc_attrs)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+   = help: consider using `min_const_generics` instead, which is more stable and complete
 
 error: item has unused generic parameters
   --> $DIR/functions.rs:15:8
diff --git a/src/test/ui/polymorphization/generators.stderr b/src/test/ui/polymorphization/generators.stderr
index c59055ba9d6..b2b32db045d 100644
--- a/src/test/ui/polymorphization/generators.stderr
+++ b/src/test/ui/polymorphization/generators.stderr
@@ -6,6 +6,7 @@ LL | #![feature(const_generics, generators, generator_trait, rustc_attrs)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+   = help: consider using `min_const_generics` instead, which is more stable and complete
 
 error: item has unused generic parameters
   --> $DIR/generators.rs:36:5
diff --git a/src/test/ui/resolve/issue-65035-static-with-parent-generics.stderr b/src/test/ui/resolve/issue-65035-static-with-parent-generics.stderr
index 7f8151db06f..5de8eb21582 100644
--- a/src/test/ui/resolve/issue-65035-static-with-parent-generics.stderr
+++ b/src/test/ui/resolve/issue-65035-static-with-parent-generics.stderr
@@ -48,6 +48,7 @@ LL | #![feature(const_generics)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+   = help: consider using `min_const_generics` instead, which is more stable and complete
 
 error: aborting due to 5 previous errors; 1 warning emitted
 
diff --git a/src/test/ui/rfc-2497-if-let-chains/disallowed-positions.stderr b/src/test/ui/rfc-2497-if-let-chains/disallowed-positions.stderr
index d38a3aba46f..bd39650702c 100644
--- a/src/test/ui/rfc-2497-if-let-chains/disallowed-positions.stderr
+++ b/src/test/ui/rfc-2497-if-let-chains/disallowed-positions.stderr
@@ -507,6 +507,7 @@ LL | #![feature(const_generics)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+   = help: consider using `min_const_generics` instead, which is more stable and complete
 
 warning: the feature `let_chains` is incomplete and may not be safe to use and/or cause compiler crashes
   --> $DIR/disallowed-positions.rs:22:12
diff --git a/src/test/ui/specialization/assoc-ty-graph-cycle.stderr b/src/test/ui/specialization/assoc-ty-graph-cycle.stderr
index 250f48f8e59..17da34caa70 100644
--- a/src/test/ui/specialization/assoc-ty-graph-cycle.stderr
+++ b/src/test/ui/specialization/assoc-ty-graph-cycle.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/specialization/cross-crate-defaults.stderr b/src/test/ui/specialization/cross-crate-defaults.stderr
index f18bc99d739..e368c2e73b6 100644
--- a/src/test/ui/specialization/cross-crate-defaults.stderr
+++ b/src/test/ui/specialization/cross-crate-defaults.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/specialization/deafult-associated-type-bound-1.stderr b/src/test/ui/specialization/deafult-associated-type-bound-1.stderr
index 337972ea2b7..4ca3d831198 100644
--- a/src/test/ui/specialization/deafult-associated-type-bound-1.stderr
+++ b/src/test/ui/specialization/deafult-associated-type-bound-1.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0277]: the trait bound `str: Clone` is not satisfied
   --> $DIR/deafult-associated-type-bound-1.rs:19:5
diff --git a/src/test/ui/specialization/deafult-associated-type-bound-2.stderr b/src/test/ui/specialization/deafult-associated-type-bound-2.stderr
index 8c9da81d277..2bc14dbe3b2 100644
--- a/src/test/ui/specialization/deafult-associated-type-bound-2.stderr
+++ b/src/test/ui/specialization/deafult-associated-type-bound-2.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0277]: can't compare `&'static B` with `B`
   --> $DIR/deafult-associated-type-bound-2.rs:16:5
diff --git a/src/test/ui/specialization/deafult-generic-associated-type-bound.stderr b/src/test/ui/specialization/deafult-generic-associated-type-bound.stderr
index f145b90f216..b5a1877ea19 100644
--- a/src/test/ui/specialization/deafult-generic-associated-type-bound.stderr
+++ b/src/test/ui/specialization/deafult-generic-associated-type-bound.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: the feature `generic_associated_types` is incomplete and may not be safe to use and/or cause compiler crashes
   --> $DIR/deafult-generic-associated-type-bound.rs:4:12
diff --git a/src/test/ui/specialization/defaultimpl/allowed-cross-crate.stderr b/src/test/ui/specialization/defaultimpl/allowed-cross-crate.stderr
index 1b50329719d..d8b9c48c72e 100644
--- a/src/test/ui/specialization/defaultimpl/allowed-cross-crate.stderr
+++ b/src/test/ui/specialization/defaultimpl/allowed-cross-crate.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/specialization/defaultimpl/out-of-order.stderr b/src/test/ui/specialization/defaultimpl/out-of-order.stderr
index deae021a891..9ca915686e8 100644
--- a/src/test/ui/specialization/defaultimpl/out-of-order.stderr
+++ b/src/test/ui/specialization/defaultimpl/out-of-order.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/specialization/defaultimpl/overlap-projection.stderr b/src/test/ui/specialization/defaultimpl/overlap-projection.stderr
index 46899ca9954..31d0e6e3882 100644
--- a/src/test/ui/specialization/defaultimpl/overlap-projection.stderr
+++ b/src/test/ui/specialization/defaultimpl/overlap-projection.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/specialization/defaultimpl/projection.stderr b/src/test/ui/specialization/defaultimpl/projection.stderr
index 8629c6c52d4..2d5c80d05f0 100644
--- a/src/test/ui/specialization/defaultimpl/projection.stderr
+++ b/src/test/ui/specialization/defaultimpl/projection.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/specialization/defaultimpl/specialization-no-default.stderr b/src/test/ui/specialization/defaultimpl/specialization-no-default.stderr
index 7958eddbeba..3f1a5495e21 100644
--- a/src/test/ui/specialization/defaultimpl/specialization-no-default.stderr
+++ b/src/test/ui/specialization/defaultimpl/specialization-no-default.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0520]: `foo` specializes an item from a parent `impl`, but that item is not marked `default`
   --> $DIR/specialization-no-default.rs:20:5
diff --git a/src/test/ui/specialization/defaultimpl/specialization-trait-item-not-implemented-rpass.stderr b/src/test/ui/specialization/defaultimpl/specialization-trait-item-not-implemented-rpass.stderr
index dc377dd10c8..163c93550fb 100644
--- a/src/test/ui/specialization/defaultimpl/specialization-trait-item-not-implemented-rpass.stderr
+++ b/src/test/ui/specialization/defaultimpl/specialization-trait-item-not-implemented-rpass.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/specialization/defaultimpl/specialization-trait-item-not-implemented.stderr b/src/test/ui/specialization/defaultimpl/specialization-trait-item-not-implemented.stderr
index 9d1eca1d6af..250f0017bea 100644
--- a/src/test/ui/specialization/defaultimpl/specialization-trait-item-not-implemented.stderr
+++ b/src/test/ui/specialization/defaultimpl/specialization-trait-item-not-implemented.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0046]: not all trait items implemented, missing: `foo_two`
   --> $DIR/specialization-trait-item-not-implemented.rs:18:1
diff --git a/src/test/ui/specialization/defaultimpl/specialization-trait-not-implemented.stderr b/src/test/ui/specialization/defaultimpl/specialization-trait-not-implemented.stderr
index 6b8e559bc36..fb623c97f42 100644
--- a/src/test/ui/specialization/defaultimpl/specialization-trait-not-implemented.stderr
+++ b/src/test/ui/specialization/defaultimpl/specialization-trait-not-implemented.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0599]: no method named `foo_one` found for struct `MyStruct` in the current scope
   --> $DIR/specialization-trait-not-implemented.rs:22:29
diff --git a/src/test/ui/specialization/defaultimpl/specialization-wfcheck.stderr b/src/test/ui/specialization/defaultimpl/specialization-wfcheck.stderr
index dcac310ed06..57b90c457cb 100644
--- a/src/test/ui/specialization/defaultimpl/specialization-wfcheck.stderr
+++ b/src/test/ui/specialization/defaultimpl/specialization-wfcheck.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0277]: the trait bound `U: Eq` is not satisfied
   --> $DIR/specialization-wfcheck.rs:7:17
diff --git a/src/test/ui/specialization/defaultimpl/validation.stderr b/src/test/ui/specialization/defaultimpl/validation.stderr
index 2449849725f..cbf0cef5e74 100644
--- a/src/test/ui/specialization/defaultimpl/validation.stderr
+++ b/src/test/ui/specialization/defaultimpl/validation.stderr
@@ -16,6 +16,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error: impls of auto traits cannot be default
   --> $DIR/validation.rs:9:21
diff --git a/src/test/ui/specialization/issue-36804.stderr b/src/test/ui/specialization/issue-36804.stderr
index 744d8820424..783a38e6bdc 100644
--- a/src/test/ui/specialization/issue-36804.stderr
+++ b/src/test/ui/specialization/issue-36804.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/specialization/issue-38091-2.stderr b/src/test/ui/specialization/issue-38091-2.stderr
index a314c26ad14..bd5ed498d92 100644
--- a/src/test/ui/specialization/issue-38091-2.stderr
+++ b/src/test/ui/specialization/issue-38091-2.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0275]: overflow evaluating the requirement `i32: Check`
    |
diff --git a/src/test/ui/specialization/issue-38091.stderr b/src/test/ui/specialization/issue-38091.stderr
index 6be0f26849f..97e5775ab54 100644
--- a/src/test/ui/specialization/issue-38091.stderr
+++ b/src/test/ui/specialization/issue-38091.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0277]: the trait bound `(): Valid` is not satisfied
   --> $DIR/issue-38091.rs:12:5
diff --git a/src/test/ui/specialization/issue-39448.stderr b/src/test/ui/specialization/issue-39448.stderr
index f3bb69b8f71..98e49b1bab3 100644
--- a/src/test/ui/specialization/issue-39448.stderr
+++ b/src/test/ui/specialization/issue-39448.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0275]: overflow evaluating the requirement `T: FromA<U>`
   --> $DIR/issue-39448.rs:45:13
diff --git a/src/test/ui/specialization/issue-39618.stderr b/src/test/ui/specialization/issue-39618.stderr
index d40d17d8f71..77a45806edb 100644
--- a/src/test/ui/specialization/issue-39618.stderr
+++ b/src/test/ui/specialization/issue-39618.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/specialization/issue-50452.stderr b/src/test/ui/specialization/issue-50452.stderr
index c01817e0b27..2f05c41346f 100644
--- a/src/test/ui/specialization/issue-50452.stderr
+++ b/src/test/ui/specialization/issue-50452.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/specialization/issue-52050.stderr b/src/test/ui/specialization/issue-52050.stderr
index a7564ced055..27070f8e4a1 100644
--- a/src/test/ui/specialization/issue-52050.stderr
+++ b/src/test/ui/specialization/issue-52050.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0119]: conflicting implementations of trait `IntoPyDictPointer` for type `()`:
   --> $DIR/issue-52050.rs:28:1
diff --git a/src/test/ui/specialization/issue-63716-parse-async.stderr b/src/test/ui/specialization/issue-63716-parse-async.stderr
index 43620e1ba51..cde17872d6b 100644
--- a/src/test/ui/specialization/issue-63716-parse-async.stderr
+++ b/src/test/ui/specialization/issue-63716-parse-async.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/specialization/issue-70442.stderr b/src/test/ui/specialization/issue-70442.stderr
index f71e4c7dd1c..5ee82e9915b 100644
--- a/src/test/ui/specialization/issue-70442.stderr
+++ b/src/test/ui/specialization/issue-70442.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/specialization/non-defaulted-item-fail.stderr b/src/test/ui/specialization/non-defaulted-item-fail.stderr
index eae045b92c0..85ccbd809b0 100644
--- a/src/test/ui/specialization/non-defaulted-item-fail.stderr
+++ b/src/test/ui/specialization/non-defaulted-item-fail.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization, associated_type_defaults)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0520]: `Ty` specializes an item from a parent `impl`, but that item is not marked `default`
   --> $DIR/non-defaulted-item-fail.rs:30:5
diff --git a/src/test/ui/specialization/specialization-allowed-cross-crate.stderr b/src/test/ui/specialization/specialization-allowed-cross-crate.stderr
index 7d087545725..9605bd08935 100644
--- a/src/test/ui/specialization/specialization-allowed-cross-crate.stderr
+++ b/src/test/ui/specialization/specialization-allowed-cross-crate.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/specialization/specialization-assoc-fns.stderr b/src/test/ui/specialization/specialization-assoc-fns.stderr
index b12738604ea..a7c0661a825 100644
--- a/src/test/ui/specialization/specialization-assoc-fns.stderr
+++ b/src/test/ui/specialization/specialization-assoc-fns.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/specialization/specialization-basics.stderr b/src/test/ui/specialization/specialization-basics.stderr
index ad00cd81df1..afb2af3803f 100644
--- a/src/test/ui/specialization/specialization-basics.stderr
+++ b/src/test/ui/specialization/specialization-basics.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/specialization/specialization-cross-crate.stderr b/src/test/ui/specialization/specialization-cross-crate.stderr
index 7481eed796d..c69130c0aef 100644
--- a/src/test/ui/specialization/specialization-cross-crate.stderr
+++ b/src/test/ui/specialization/specialization-cross-crate.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/specialization/specialization-default-methods.stderr b/src/test/ui/specialization/specialization-default-methods.stderr
index 4fa19adad06..ef6365ed31f 100644
--- a/src/test/ui/specialization/specialization-default-methods.stderr
+++ b/src/test/ui/specialization/specialization-default-methods.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/specialization/specialization-default-projection.stderr b/src/test/ui/specialization/specialization-default-projection.stderr
index 456eb6d5ca5..445bc1646f0 100644
--- a/src/test/ui/specialization/specialization-default-projection.stderr
+++ b/src/test/ui/specialization/specialization-default-projection.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0308]: mismatched types
   --> $DIR/specialization-default-projection.rs:21:5
diff --git a/src/test/ui/specialization/specialization-default-types.stderr b/src/test/ui/specialization/specialization-default-types.stderr
index 5acfb53e206..5ba38facee0 100644
--- a/src/test/ui/specialization/specialization-default-types.stderr
+++ b/src/test/ui/specialization/specialization-default-types.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0308]: mismatched types
   --> $DIR/specialization-default-types.rs:15:9
diff --git a/src/test/ui/specialization/specialization-no-default.stderr b/src/test/ui/specialization/specialization-no-default.stderr
index bb8b2a6c98e..711c1fda149 100644
--- a/src/test/ui/specialization/specialization-no-default.stderr
+++ b/src/test/ui/specialization/specialization-no-default.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0520]: `foo` specializes an item from a parent `impl`, but that item is not marked `default`
   --> $DIR/specialization-no-default.rs:20:5
diff --git a/src/test/ui/specialization/specialization-on-projection.stderr b/src/test/ui/specialization/specialization-on-projection.stderr
index d91668d10c5..d051ffe0a02 100644
--- a/src/test/ui/specialization/specialization-on-projection.stderr
+++ b/src/test/ui/specialization/specialization-on-projection.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/specialization/specialization-out-of-order.stderr b/src/test/ui/specialization/specialization-out-of-order.stderr
index a17f9f11a3f..785ec29239b 100644
--- a/src/test/ui/specialization/specialization-out-of-order.stderr
+++ b/src/test/ui/specialization/specialization-out-of-order.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/specialization/specialization-overlap-negative.stderr b/src/test/ui/specialization/specialization-overlap-negative.stderr
index 6141174ba8c..552b04a6019 100644
--- a/src/test/ui/specialization/specialization-overlap-negative.stderr
+++ b/src/test/ui/specialization/specialization-overlap-negative.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0751]: found both positive and negative implementation of trait `std::marker::Send` for type `TestType<_>`:
   --> $DIR/specialization-overlap-negative.rs:9:1
diff --git a/src/test/ui/specialization/specialization-overlap-projection.stderr b/src/test/ui/specialization/specialization-overlap-projection.stderr
index 6f1a594bacb..c92db73074d 100644
--- a/src/test/ui/specialization/specialization-overlap-projection.stderr
+++ b/src/test/ui/specialization/specialization-overlap-projection.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/specialization/specialization-overlap.stderr b/src/test/ui/specialization/specialization-overlap.stderr
index cf0f186a183..7e5c96ac1c8 100644
--- a/src/test/ui/specialization/specialization-overlap.stderr
+++ b/src/test/ui/specialization/specialization-overlap.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0119]: conflicting implementations of trait `Foo` for type `std::vec::Vec<_>`:
   --> $DIR/specialization-overlap.rs:5:1
diff --git a/src/test/ui/specialization/specialization-polarity.stderr b/src/test/ui/specialization/specialization-polarity.stderr
index c44af22b8e6..be013552f5d 100644
--- a/src/test/ui/specialization/specialization-polarity.stderr
+++ b/src/test/ui/specialization/specialization-polarity.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0751]: found both positive and negative implementation of trait `Foo` for type `u8`:
   --> $DIR/specialization-polarity.rs:10:1
diff --git a/src/test/ui/specialization/specialization-projection-alias.stderr b/src/test/ui/specialization/specialization-projection-alias.stderr
index 0c3659a8f7a..6d2bca5d2df 100644
--- a/src/test/ui/specialization/specialization-projection-alias.stderr
+++ b/src/test/ui/specialization/specialization-projection-alias.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/specialization/specialization-projection.stderr b/src/test/ui/specialization/specialization-projection.stderr
index c5c86f5108e..0f1ecf5e379 100644
--- a/src/test/ui/specialization/specialization-projection.stderr
+++ b/src/test/ui/specialization/specialization-projection.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/specialization/specialization-super-traits.stderr b/src/test/ui/specialization/specialization-super-traits.stderr
index 05bdfd40136..165703d6365 100644
--- a/src/test/ui/specialization/specialization-super-traits.stderr
+++ b/src/test/ui/specialization/specialization-super-traits.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/specialization/specialization-translate-projections-with-lifetimes.stderr b/src/test/ui/specialization/specialization-translate-projections-with-lifetimes.stderr
index 6284dd8f3f7..d30f7af2cbd 100644
--- a/src/test/ui/specialization/specialization-translate-projections-with-lifetimes.stderr
+++ b/src/test/ui/specialization/specialization-translate-projections-with-lifetimes.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/specialization/specialization-translate-projections-with-params.stderr b/src/test/ui/specialization/specialization-translate-projections-with-params.stderr
index b17794173c5..1762248f695 100644
--- a/src/test/ui/specialization/specialization-translate-projections-with-params.stderr
+++ b/src/test/ui/specialization/specialization-translate-projections-with-params.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/specialization/specialization-translate-projections.stderr b/src/test/ui/specialization/specialization-translate-projections.stderr
index fbb28e60640..94a0e79dd56 100644
--- a/src/test/ui/specialization/specialization-translate-projections.stderr
+++ b/src/test/ui/specialization/specialization-translate-projections.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/traits/negative-impls/negative-default-impls.stderr b/src/test/ui/traits/negative-impls/negative-default-impls.stderr
index 50e74373b53..ceb86559d85 100644
--- a/src/test/ui/traits/negative-impls/negative-default-impls.stderr
+++ b/src/test/ui/traits/negative-impls/negative-default-impls.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0750]: negative impls cannot be default impls
   --> $DIR/negative-default-impls.rs:9:1
diff --git a/src/test/ui/traits/negative-impls/negative-specializes-negative.stderr b/src/test/ui/traits/negative-impls/negative-specializes-negative.stderr
index 8b536de3786..9a846143d3d 100644
--- a/src/test/ui/traits/negative-impls/negative-specializes-negative.stderr
+++ b/src/test/ui/traits/negative-impls/negative-specializes-negative.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/traits/negative-impls/negative-specializes-positive-item.stderr b/src/test/ui/traits/negative-impls/negative-specializes-positive-item.stderr
index 89ef15e89ac..77b4373a273 100644
--- a/src/test/ui/traits/negative-impls/negative-specializes-positive-item.stderr
+++ b/src/test/ui/traits/negative-impls/negative-specializes-positive-item.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0751]: found both positive and negative implementation of trait `MyTrait` for type `u32`:
   --> $DIR/negative-specializes-positive-item.rs:11:1
diff --git a/src/test/ui/traits/negative-impls/negative-specializes-positive.stderr b/src/test/ui/traits/negative-impls/negative-specializes-positive.stderr
index e45d5a251ab..e5dc81b3eb7 100644
--- a/src/test/ui/traits/negative-impls/negative-specializes-positive.stderr
+++ b/src/test/ui/traits/negative-impls/negative-specializes-positive.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0751]: found both positive and negative implementation of trait `MyTrait` for type `u32`:
   --> $DIR/negative-specializes-positive.rs:7:1
diff --git a/src/test/ui/traits/negative-impls/positive-specializes-negative.stderr b/src/test/ui/traits/negative-impls/positive-specializes-negative.stderr
index 49c16d47404..c091bc81da3 100644
--- a/src/test/ui/traits/negative-impls/positive-specializes-negative.stderr
+++ b/src/test/ui/traits/negative-impls/positive-specializes-negative.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 error[E0751]: found both positive and negative implementation of trait `MyTrait` for type `u32`:
   --> $DIR/positive-specializes-negative.rs:7:1
diff --git a/src/test/ui/transmute-specialization.stderr b/src/test/ui/transmute-specialization.stderr
index 02315051d30..a0ea72415a1 100644
--- a/src/test/ui/transmute-specialization.stderr
+++ b/src/test/ui/transmute-specialization.stderr
@@ -6,6 +6,7 @@ LL | #![feature(specialization)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = 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
 
 warning: 1 warning emitted
 
diff --git a/src/test/ui/type-alias-impl-trait/assoc-type-const.stderr b/src/test/ui/type-alias-impl-trait/assoc-type-const.stderr
index e0c1b023861..c5b22f0026d 100644
--- a/src/test/ui/type-alias-impl-trait/assoc-type-const.stderr
+++ b/src/test/ui/type-alias-impl-trait/assoc-type-const.stderr
@@ -6,6 +6,7 @@ LL | #![feature(const_generics)]
    |
    = note: `#[warn(incomplete_features)]` on by default
    = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
+   = help: consider using `min_const_generics` instead, which is more stable and complete
 
 warning: 1 warning emitted