Delay a bug and mark precise_capturing as not incomplete

compiler/rustc_ast_lowering/src/lib.rs

@@ -1385,7 +1385,11 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                                 None
                             }
                             // Ignore `use` syntax since that is not valid in objects.
-                            GenericBound::Use(..) => None,
+                            GenericBound::Use(_, span) => {
+                                this.dcx()
+                                    .span_delayed_bug(*span, "use<> not allowed in dyn types");
+                                None
+                            }
                         }));
                     let lifetime_bound =
                         lifetime_bound.unwrap_or_else(|| this.elided_dyn_bound(t.span));

compiler/rustc_feature/src/unstable.rs

@@ -568,7 +568,7 @@ declare_features! (
     /// Allows postfix match `expr.match { ... }`
     (unstable, postfix_match, "1.79.0", Some(121618)),
     /// Allows `use<'a, 'b, A, B>` in `impl Trait + use<...>` for precise capture of generic args.
-    (incomplete, precise_capturing, "1.79.0", Some(123432)),
+    (unstable, precise_capturing, "1.79.0", Some(123432)),
     /// Allows macro attributes on expressions, statements and non-inline modules.
     (unstable, proc_macro_hygiene, "1.30.0", Some(54727)),
     /// Allows `&raw const $place_expr` and `&raw mut $place_expr` expressions.

tests/ui/impl-trait/call_method_ambiguous.next.stderr

@@ -1,5 +1,5 @@
 error[E0282]: type annotations needed
-  --> $DIR/call_method_ambiguous.rs:29:13
+  --> $DIR/call_method_ambiguous.rs:28:13
    |
 LL |         let mut iter = foo(n - 1, m);
    |             ^^^^^^^^

tests/ui/impl-trait/call_method_ambiguous.rs

@@ -3,7 +3,6 @@
 //@[current] run-pass
 
 #![feature(precise_capturing)]
-#![allow(incomplete_features)]
 
 trait Get {
     fn get(&mut self) -> u32;
@@ -24,7 +23,7 @@ where
     }
 }
 
-fn foo(n: usize, m: &mut ()) -> impl use<'_> Get {
+fn foo(n: usize, m: &mut ()) -> impl Get + use<'_> {
     if n > 0 {
         let mut iter = foo(n - 1, m);
         //[next]~^ type annotations needed

tests/ui/impl-trait/precise-capturing/apit.rs

@@ -1,5 +1,4 @@
 #![feature(precise_capturing)]
-//~^ WARN the feature `precise_capturing` is incomplete
 
 fn hello(_: impl Sized + use<>) {}
 //~^ ERROR `use<...>` precise capturing syntax not allowed in argument-position `impl Trait`

tests/ui/impl-trait/precise-capturing/apit.stderr

@@ -1,17 +1,8 @@
-warning: the feature `precise_capturing` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/apit.rs:1:12
-   |
-LL | #![feature(precise_capturing)]
-   |            ^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #123432 <https://github.com/rust-lang/rust/issues/123432> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error: `use<...>` precise capturing syntax not allowed in argument-position `impl Trait`
-  --> $DIR/apit.rs:4:26
+  --> $DIR/apit.rs:3:26
    |
 LL | fn hello(_: impl Sized + use<>) {}
    |                          ^^^^^
 
-error: aborting due to 1 previous error; 1 warning emitted
+error: aborting due to 1 previous error
 

tests/ui/impl-trait/precise-capturing/bad-lifetimes.rs

@@ -1,5 +1,4 @@
 #![feature(precise_capturing)]
-//~^ WARN the feature `precise_capturing` is incomplete
 
 fn no_elided_lt() -> impl Sized + use<'_> {}
 //~^ ERROR missing lifetime specifier

tests/ui/impl-trait/precise-capturing/bad-lifetimes.stderr

@@ -1,5 +1,5 @@
 error[E0106]: missing lifetime specifier
-  --> $DIR/bad-lifetimes.rs:4:39
+  --> $DIR/bad-lifetimes.rs:3:39
    |
 LL | fn no_elided_lt() -> impl Sized + use<'_> {}
    |                                       ^^ expected named lifetime parameter
@@ -11,35 +11,26 @@ LL | fn no_elided_lt() -> impl Sized + use<'static> {}
    |                                       ~~~~~~~
 
 error[E0261]: use of undeclared lifetime name `'missing`
-  --> $DIR/bad-lifetimes.rs:11:37
+  --> $DIR/bad-lifetimes.rs:10:37
    |
 LL | fn missing_lt() -> impl Sized + use<'missing> {}
    |              -                      ^^^^^^^^ undeclared lifetime
    |              |
    |              help: consider introducing lifetime `'missing` here: `<'missing>`
 
-warning: the feature `precise_capturing` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/bad-lifetimes.rs:1:12
-   |
-LL | #![feature(precise_capturing)]
-   |            ^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #123432 <https://github.com/rust-lang/rust/issues/123432> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error: expected lifetime parameter in `use<...>` precise captures list, found `'_`
-  --> $DIR/bad-lifetimes.rs:4:39
+  --> $DIR/bad-lifetimes.rs:3:39
    |
 LL | fn no_elided_lt() -> impl Sized + use<'_> {}
    |                                       ^^
 
 error: expected lifetime parameter in `use<...>` precise captures list, found `'static`
-  --> $DIR/bad-lifetimes.rs:8:36
+  --> $DIR/bad-lifetimes.rs:7:36
    |
 LL | fn static_lt() -> impl Sized + use<'static> {}
    |                                    ^^^^^^^
 
-error: aborting due to 4 previous errors; 1 warning emitted
+error: aborting due to 4 previous errors
 
 Some errors have detailed explanations: E0106, E0261.
 For more information about an error, try `rustc --explain E0106`.

tests/ui/impl-trait/precise-capturing/bad-params.rs

@@ -1,5 +1,4 @@
 #![feature(precise_capturing)]
-//~^ WARN the feature `precise_capturing` is incomplete
 
 fn missing() -> impl Sized + use<T> {}
 //~^ ERROR cannot find type `T` in this scope

tests/ui/impl-trait/precise-capturing/bad-params.stderr

@@ -1,5 +1,5 @@
 error[E0412]: cannot find type `T` in this scope
-  --> $DIR/bad-params.rs:4:34
+  --> $DIR/bad-params.rs:3:34
    |
 LL | fn missing() -> impl Sized + use<T> {}
    |                                  ^ not found in this scope
@@ -10,37 +10,28 @@ LL | fn missing<T>() -> impl Sized + use<T> {}
    |           +++
 
 error[E0411]: cannot find type `Self` in this scope
-  --> $DIR/bad-params.rs:7:39
+  --> $DIR/bad-params.rs:6:39
    |
 LL | fn missing_self() -> impl Sized + use<Self> {}
    |    ------------                       ^^^^ `Self` is only available in impls, traits, and type definitions
    |    |
    |    `Self` not allowed in a function
 
-warning: the feature `precise_capturing` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/bad-params.rs:1:12
-   |
-LL | #![feature(precise_capturing)]
-   |            ^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #123432 <https://github.com/rust-lang/rust/issues/123432> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error: `Self` can't be captured in `use<...>` precise captures list, since it is an alias
-  --> $DIR/bad-params.rs:12:48
+  --> $DIR/bad-params.rs:11:48
    |
 LL | impl MyType {
    | ----------- `Self` is not a generic argument, but an alias to the type of the implementation
 LL |     fn self_is_not_param() -> impl Sized + use<Self> {}
    |                                                ^^^^
 
 error: expected type or const parameter in `use<...>` precise captures list, found function
-  --> $DIR/bad-params.rs:16:32
+  --> $DIR/bad-params.rs:15:32
    |
 LL | fn hello() -> impl Sized + use<hello> {}
    |                                ^^^^^
 
-error: aborting due to 4 previous errors; 1 warning emitted
+error: aborting due to 4 previous errors
 
 Some errors have detailed explanations: E0411, E0412.
 For more information about an error, try `rustc --explain E0411`.

tests/ui/impl-trait/precise-capturing/capture-parent-arg.rs

@@ -1,5 +1,4 @@
 #![feature(precise_capturing)]
-//~^ WARN the feature `precise_capturing` is incomplete
 
 trait Tr {
     type Assoc;

tests/ui/impl-trait/precise-capturing/capture-parent-arg.stderr

@@ -1,27 +1,18 @@
-warning: the feature `precise_capturing` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/capture-parent-arg.rs:1:12
-   |
-LL | #![feature(precise_capturing)]
-   |            ^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #123432 <https://github.com/rust-lang/rust/issues/123432> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error: `impl Trait` captures lifetime parameter, but it is not mentioned in `use<...>` precise captures list
-  --> $DIR/capture-parent-arg.rs:28:31
+  --> $DIR/capture-parent-arg.rs:27:31
    |
 LL | impl<'a> W<'a> {
    |      -- this lifetime parameter is captured
 LL |     fn bad1() -> impl Into<<W<'a> as Tr>::Assoc> + use<> {}
    |                  -------------^^------------------------ lifetime captured due to being mentioned in the bounds of the `impl Trait`
 
 error: `impl Trait` captures lifetime parameter, but it is not mentioned in `use<...>` precise captures list
-  --> $DIR/capture-parent-arg.rs:34:18
+  --> $DIR/capture-parent-arg.rs:33:18
    |
 LL | impl<'a> W<'a> {
    |      -- this lifetime parameter is captured
 LL |     fn bad2() -> impl Into<<Self as Tr>::Assoc> + use<> {}
    |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ lifetime captured due to being mentioned in the bounds of the `impl Trait`
 
-error: aborting due to 2 previous errors; 1 warning emitted
+error: aborting due to 2 previous errors
 

tests/ui/impl-trait/precise-capturing/duplicated-use.real.stderr

@@ -1,17 +1,8 @@
 error: duplicate `use<...>` precise capturing syntax
-  --> $DIR/duplicated-use.rs:8:32
+  --> $DIR/duplicated-use.rs:7:32
    |
 LL | fn hello<'a>() -> impl Sized + use<'a> + use<'a> {}
    |                                ^^^^^^^   ------- second `use<...>` here
 
-warning: the feature `precise_capturing` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/duplicated-use.rs:4:12
-   |
-LL | #![feature(precise_capturing)]
-   |            ^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #123432 <https://github.com/rust-lang/rust/issues/123432> 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/impl-trait/precise-capturing/duplicated-use.rs

@@ -2,7 +2,6 @@
 //@[pre_expansion] check-pass
 
 #![feature(precise_capturing)]
-//~^ WARN the feature `precise_capturing` is incomplete
 
 #[cfg(real)]
 fn hello<'a>() -> impl Sized + use<'a> + use<'a> {}

tests/ui/impl-trait/precise-capturing/elided.rs

@@ -1,7 +1,6 @@
 //@ check-pass
 
 #![feature(precise_capturing)]
-//~^ WARN the feature `precise_capturing` is incomplete
 
 fn elided(x: &()) -> impl Sized + use<'_> { x }
 

tests/ui/impl-trait/precise-capturing/forgot-to-capture-const.rs

@@ -1,5 +1,4 @@
 #![feature(precise_capturing)]
-//~^ WARN the feature `precise_capturing` is incomplete
 
 fn constant<const C: usize>() -> impl Sized + use<> {}
 //~^ ERROR `impl Trait` must mention all const parameters in scope

tests/ui/impl-trait/precise-capturing/forgot-to-capture-const.stderr

@@ -1,14 +1,5 @@
-warning: the feature `precise_capturing` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/forgot-to-capture-const.rs:1:12
-   |
-LL | #![feature(precise_capturing)]
-   |            ^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #123432 <https://github.com/rust-lang/rust/issues/123432> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error: `impl Trait` must mention all const parameters in scope in `use<...>`
-  --> $DIR/forgot-to-capture-const.rs:4:34
+  --> $DIR/forgot-to-capture-const.rs:3:34
    |
 LL | fn constant<const C: usize>() -> impl Sized + use<> {}
    |             --------------       ^^^^^^^^^^^^^^^^^^
@@ -17,5 +8,5 @@ LL | fn constant<const C: usize>() -> impl Sized + use<> {}
    |
    = note: currently, all const parameters are required to be mentioned in the precise captures list
 
-error: aborting due to 1 previous error; 1 warning emitted
+error: aborting due to 1 previous error
 

tests/ui/impl-trait/precise-capturing/forgot-to-capture-lifetime.rs

@@ -1,5 +1,4 @@
 #![feature(precise_capturing)]
-//~^ WARN the feature `precise_capturing` is incomplete
 
 fn lifetime_in_bounds<'a>(x: &'a ()) -> impl Into<&'a ()> + use<> { x }
 //~^ ERROR `impl Trait` captures lifetime parameter, but it is not mentioned in `use<...>` precise captures list

tests/ui/impl-trait/precise-capturing/forgot-to-capture-lifetime.stderr

@@ -1,14 +1,5 @@
-warning: the feature `precise_capturing` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/forgot-to-capture-lifetime.rs:1:12
-   |
-LL | #![feature(precise_capturing)]
-   |            ^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #123432 <https://github.com/rust-lang/rust/issues/123432> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error: `impl Trait` captures lifetime parameter, but it is not mentioned in `use<...>` precise captures list
-  --> $DIR/forgot-to-capture-lifetime.rs:4:52
+  --> $DIR/forgot-to-capture-lifetime.rs:3:52
    |
 LL | fn lifetime_in_bounds<'a>(x: &'a ()) -> impl Into<&'a ()> + use<> { x }
    |                       --                -----------^^------------
@@ -17,7 +8,7 @@ LL | fn lifetime_in_bounds<'a>(x: &'a ()) -> impl Into<&'a ()> + use<> { x }
    |                       this lifetime parameter is captured
 
 error[E0700]: hidden type for `impl Sized` captures lifetime that does not appear in bounds
-  --> $DIR/forgot-to-capture-lifetime.rs:7:62
+  --> $DIR/forgot-to-capture-lifetime.rs:6:62
    |
 LL | fn lifetime_in_hidden<'a>(x: &'a ()) -> impl Sized + use<> { x }
    |                       --                ------------------   ^
@@ -30,6 +21,6 @@ help: to declare that `impl Sized` captures `'a`, you can add an explicit `'a` l
 LL | fn lifetime_in_hidden<'a>(x: &'a ()) -> impl Sized + use<> + 'a { x }
    |                                                            ++++
 
-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 E0700`.

tests/ui/impl-trait/precise-capturing/forgot-to-capture-type.rs

@@ -1,5 +1,4 @@
 #![feature(precise_capturing)]
-//~^ WARN the feature `precise_capturing` is incomplete
 
 fn type_param<T>() -> impl Sized + use<> {}
 //~^ ERROR `impl Trait` must mention all type parameters in scope

tests/ui/impl-trait/precise-capturing/forgot-to-capture-type.stderr

@@ -1,14 +1,5 @@
-warning: the feature `precise_capturing` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/forgot-to-capture-type.rs:1:12
-   |
-LL | #![feature(precise_capturing)]
-   |            ^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #123432 <https://github.com/rust-lang/rust/issues/123432> for more information
-   = note: `#[warn(incomplete_features)]` on by default
-
 error: `impl Trait` must mention all type parameters in scope in `use<...>`
-  --> $DIR/forgot-to-capture-type.rs:4:23
+  --> $DIR/forgot-to-capture-type.rs:3:23
    |
 LL | fn type_param<T>() -> impl Sized + use<> {}
    |               -       ^^^^^^^^^^^^^^^^^^
@@ -18,7 +9,7 @@ LL | fn type_param<T>() -> impl Sized + use<> {}
    = note: currently, all type parameters are required to be mentioned in the precise captures list
 
 error: `impl Trait` must mention the `Self` type of the trait in `use<...>`
-  --> $DIR/forgot-to-capture-type.rs:8:17
+  --> $DIR/forgot-to-capture-type.rs:7:17
    |
 LL | trait Foo {
    | --------- `Self` type parameter is implicitly captured by this `impl Trait`
@@ -27,5 +18,5 @@ LL |     fn bar() -> impl Sized + use<>;
    |
    = note: currently, all type parameters are required to be mentioned in the precise captures list
 
-error: aborting due to 2 previous errors; 1 warning emitted
+error: aborting due to 2 previous errors
 

tests/ui/impl-trait/precise-capturing/higher-ranked.rs

@@ -3,7 +3,6 @@
 // Show how precise captures allow us to skip capturing a higher-ranked lifetime
 
 #![feature(lifetime_capture_rules_2024, precise_capturing)]
-//~^ WARN the feature `precise_capturing` is incomplete
 
 trait Trait<'a> {
     type Item;