Remove the incomplete marker from const closures

rust-lang · matthiaskrgr · Mar 11, 2026 · Mar 12, 2026 · Mar 12, 2026 · Mar 12, 2026
commit c521b8084fb910e4a809c0611944fc9404138615
diff --git a/compiler/rustc_feature/src/unstable.rs b/compiler/rustc_feature/src/unstable.rs
@@ -429,7 +429,7 @@ declare_features! (
     /// Allows defining and calling c-variadic functions in const contexts.
     (unstable, const_c_variadic, "1.95.0", Some(151787)),
     /// Allows `const || {}` closures in const contexts.
-    (incomplete, const_closures, "1.68.0", Some(106003)),
+    (unstable, const_closures, "1.68.0", Some(106003)),
     /// Allows using `[const] Destruct` bounds and calling drop impls in const contexts.
     (unstable, const_destruct, "1.85.0", Some(133214)),
     /// Allows `for _ in _` loops in const contexts.

diff --git a/tests/ui/traits/const-traits/call-const-closure.rs b/tests/ui/traits/const-traits/call-const-closure.rs
@@ -2,7 +2,6 @@
 //@ edition:2021
 
 #![feature(const_trait_impl, const_closures)]
-#![allow(incomplete_features)]
 
 const trait Bar {
     fn foo(&self);

diff --git a/tests/ui/traits/const-traits/call-const-closure.stderr b/tests/ui/traits/const-traits/call-const-closure.stderr
@@ -1,5 +1,5 @@
 error[E0277]: the trait bound `(): const Bar` is not satisfied
-  --> $DIR/call-const-closure.rs:16:18
+  --> $DIR/call-const-closure.rs:15:18
    |
 LL |     (const || ().foo())();
    |                  ^^^

diff --git a/tests/ui/traits/const-traits/call.rs b/tests/ui/traits/const-traits/call.rs
@@ -2,7 +2,6 @@
 //@[next] compile-flags: -Znext-solver
 //@revisions: next old
 #![feature(const_closures, const_trait_impl)]
-#![allow(incomplete_features)]
 
 const _: () = {
     assert!((const || true)());

diff --git a/tests/ui/traits/const-traits/const-closure-issue-125866-error.rs b/tests/ui/traits/const-traits/const-closure-issue-125866-error.rs
@@ -1,4 +1,3 @@
-#![allow(incomplete_features)]
 #![feature(const_closures, const_trait_impl)]
 
 const fn create_array<const N: usize>(mut f: impl FnMut(usize) -> u32 + Copy) -> [u32; N] {

diff --git a/tests/ui/traits/const-traits/const-closure-issue-125866-error.stderr b/tests/ui/traits/const-traits/const-closure-issue-125866-error.stderr
@@ -1,5 +1,5 @@
 error[E0277]: the trait bound `impl FnMut(usize) -> u32 + Copy: [const] FnMut(usize)` is not satisfied
-  --> $DIR/const-closure-issue-125866-error.rs:8:22
+  --> $DIR/const-closure-issue-125866-error.rs:7:22
    |
 LL |         array[i] = f(i);
    |                    - ^

diff --git a/tests/ui/traits/const-traits/const-closure-parse-not-item.rs b/tests/ui/traits/const-traits/const-closure-parse-not-item.rs
@@ -1,7 +1,6 @@
 //@check-pass
 
 #![feature(const_trait_impl, const_closures)]
-#![allow(incomplete_features)]
 
 const fn test() -> impl [const] Fn() {
     const move || {}

diff --git a/tests/ui/traits/const-traits/const_closure-const_trait_impl-ice-113381.rs b/tests/ui/traits/const-traits/const_closure-const_trait_impl-ice-113381.rs
@@ -1,7 +1,6 @@
 //@ known-bug: #110395
 //@ compile-flags: -Znext-solver
 #![feature(const_closures, const_trait_impl)]
-#![allow(incomplete_features)]
 
 trait Foo {
     fn foo(&self);

diff --git a/tests/ui/traits/const-traits/const_closure-const_trait_impl-ice-113381.stderr b/tests/ui/traits/const-traits/const_closure-const_trait_impl-ice-113381.stderr
@@ -1,5 +1,5 @@
 error: cannot use `const` closures outside of const contexts
-  --> $DIR/const_closure-const_trait_impl-ice-113381.rs:15:6
+  --> $DIR/const_closure-const_trait_impl-ice-113381.rs:14:6
    |
 LL |     (const || (()).foo())();
    |      ^^^^^

diff --git a/tests/ui/traits/const-traits/ice-112822-expected-type-for-param.rs b/tests/ui/traits/const-traits/ice-112822-expected-type-for-param.rs
@@ -1,5 +1,4 @@
 #![feature(const_trait_impl, const_closures, const_cmp)]
-#![allow(incomplete_features)]
 
 const fn test() -> impl [const] Fn() {
     const move || {

diff --git a/tests/ui/traits/const-traits/ice-112822-expected-type-for-param.stderr b/tests/ui/traits/const-traits/ice-112822-expected-type-for-param.stderr
@@ -1,5 +1,5 @@
 error[E0015]: cannot call non-const function `core::panicking::assert_failed::<&u8, &u8>` in constant functions
-  --> $DIR/ice-112822-expected-type-for-param.rs:10:17
+  --> $DIR/ice-112822-expected-type-for-param.rs:9:17
    |
 LL |                 assert_eq!(first, &b'f');
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^

diff --git a/tests/ui/traits/const-traits/non-const-op-const-closure-non-const-outer.rs b/tests/ui/traits/const-traits/non-const-op-const-closure-non-const-outer.rs
@@ -1,5 +1,4 @@
 #![feature(const_closures, const_trait_impl)]
-#![allow(incomplete_features)]
 
 trait Foo {
     fn foo(&self);

diff --git a/tests/ui/traits/const-traits/non-const-op-const-closure-non-const-outer.stderr b/tests/ui/traits/const-traits/non-const-op-const-closure-non-const-outer.stderr
@@ -1,5 +1,5 @@
 error: cannot use `const` closures outside of const contexts
-  --> $DIR/non-const-op-const-closure-non-const-outer.rs:15:6
+  --> $DIR/non-const-op-const-closure-non-const-outer.rs:14:6
    |
 LL |     (const || { (()).foo() })();
    |      ^^^^^