Update tests after rebase

Fix #119652.

tests/ui/object-safety/avoid-ice-on-warning-3.rs

@@ -0,0 +1,17 @@
+trait B { fn f(a: A) -> A; }
+//~^ WARN trait objects without an explicit `dyn` are deprecated
+//~| WARN trait objects without an explicit `dyn` are deprecated
+//~| WARN trait objects without an explicit `dyn` are deprecated
+//~| WARN this is accepted in the current edition
+//~| WARN this is accepted in the current edition
+//~| WARN this is accepted in the current edition
+//~| ERROR the trait `A` cannot be made into an object
+trait A { fn g(b: B) -> B; }
+//~^ WARN trait objects without an explicit `dyn` are deprecated
+//~| WARN trait objects without an explicit `dyn` are deprecated
+//~| WARN trait objects without an explicit `dyn` are deprecated
+//~| WARN this is accepted in the current edition
+//~| WARN this is accepted in the current edition
+//~| WARN this is accepted in the current edition
+//~| ERROR the trait `B` cannot be made into an object
+fn main() {}

tests/ui/object-safety/avoid-ice-on-warning-3.stderr

@@ -0,0 +1,148 @@
+warning: trait objects without an explicit `dyn` are deprecated
+  --> $DIR/avoid-ice-on-warning-3.rs:9:19
+   |
+LL | trait A { fn g(b: B) -> B; }
+   |                   ^
+   |
+   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
+   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
+   = note: `B` it is not object safe, so it can't be `dyn`
+   = note: `#[warn(bare_trait_objects)]` on by default
+help: use a new generic type parameter, constrained by `B`
+   |
+LL | trait A { fn g<T: B>(b: T) -> B; }
+   |               ++++++    ~
+help: you can also use an opaque type, but users won't be able to specify the type parameter when calling the `fn`, having to rely exclusively on type inference
+   |
+LL | trait A { fn g(b: impl B) -> B; }
+   |                   ++++
+
+warning: trait objects without an explicit `dyn` are deprecated
+  --> $DIR/avoid-ice-on-warning-3.rs:9:25
+   |
+LL | trait A { fn g(b: B) -> B; }
+   |                         ^
+   |
+   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
+   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
+help: `B` is not object safe, use `impl B` to return an opaque type, as long as you return a single underlying type
+   |
+LL | trait A { fn g(b: B) -> impl B; }
+   |                         ++++
+
+warning: trait objects without an explicit `dyn` are deprecated
+  --> $DIR/avoid-ice-on-warning-3.rs:1:19
+   |
+LL | trait B { fn f(a: A) -> A; }
+   |                   ^
+   |
+   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
+   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
+   = note: `A` it is not object safe, so it can't be `dyn`
+help: use a new generic type parameter, constrained by `A`
+   |
+LL | trait B { fn f<T: A>(a: T) -> A; }
+   |               ++++++    ~
+help: you can also use an opaque type, but users won't be able to specify the type parameter when calling the `fn`, having to rely exclusively on type inference
+   |
+LL | trait B { fn f(a: impl A) -> A; }
+   |                   ++++
+
+warning: trait objects without an explicit `dyn` are deprecated
+  --> $DIR/avoid-ice-on-warning-3.rs:1:25
+   |
+LL | trait B { fn f(a: A) -> A; }
+   |                         ^
+   |
+   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
+   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
+help: `A` is not object safe, use `impl A` to return an opaque type, as long as you return a single underlying type
+   |
+LL | trait B { fn f(a: A) -> impl A; }
+   |                         ++++
+
+warning: trait objects without an explicit `dyn` are deprecated
+  --> $DIR/avoid-ice-on-warning-3.rs:1:19
+   |
+LL | trait B { fn f(a: A) -> A; }
+   |                   ^
+   |
+   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
+   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
+   = note: `A` it is not object safe, so it can't be `dyn`
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
+help: use a new generic type parameter, constrained by `A`
+   |
+LL | trait B { fn f<T: A>(a: T) -> A; }
+   |               ++++++    ~
+help: you can also use an opaque type, but users won't be able to specify the type parameter when calling the `fn`, having to rely exclusively on type inference
+   |
+LL | trait B { fn f(a: impl A) -> A; }
+   |                   ++++
+
+error[E0038]: the trait `A` cannot be made into an object
+  --> $DIR/avoid-ice-on-warning-3.rs:1:19
+   |
+LL | trait B { fn f(a: A) -> A; }
+   |                   ^ `A` cannot be made into an object
+   |
+note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
+  --> $DIR/avoid-ice-on-warning-3.rs:9:14
+   |
+LL | trait A { fn g(b: B) -> B; }
+   |       -      ^ ...because associated function `g` has no `self` parameter
+   |       |
+   |       this trait cannot be made into an object...
+help: consider turning `g` into a method by giving it a `&self` argument
+   |
+LL | trait A { fn g(&self, b: B) -> B; }
+   |                ++++++
+help: alternatively, consider constraining `g` so it does not apply to trait objects
+   |
+LL | trait A { fn g(b: B) -> B where Self: Sized; }
+   |                           +++++++++++++++++
+
+warning: trait objects without an explicit `dyn` are deprecated
+  --> $DIR/avoid-ice-on-warning-3.rs:9:19
+   |
+LL | trait A { fn g(b: B) -> B; }
+   |                   ^
+   |
+   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
+   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
+   = note: `B` it is not object safe, so it can't be `dyn`
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
+help: use a new generic type parameter, constrained by `B`
+   |
+LL | trait A { fn g<T: B>(b: T) -> B; }
+   |               ++++++    ~
+help: you can also use an opaque type, but users won't be able to specify the type parameter when calling the `fn`, having to rely exclusively on type inference
+   |
+LL | trait A { fn g(b: impl B) -> B; }
+   |                   ++++
+
+error[E0038]: the trait `B` cannot be made into an object
+  --> $DIR/avoid-ice-on-warning-3.rs:9:19
+   |
+LL | trait A { fn g(b: B) -> B; }
+   |                   ^ `B` cannot be made into an object
+   |
+note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
+  --> $DIR/avoid-ice-on-warning-3.rs:1:14
+   |
+LL | trait B { fn f(a: A) -> A; }
+   |       -      ^ ...because associated function `f` has no `self` parameter
+   |       |
+   |       this trait cannot be made into an object...
+help: consider turning `f` into a method by giving it a `&self` argument
+   |
+LL | trait B { fn f(&self, a: A) -> A; }
+   |                ++++++
+help: alternatively, consider constraining `f` so it does not apply to trait objects
+   |
+LL | trait B { fn f(a: A) -> A where Self: Sized; }
+   |                           +++++++++++++++++
+
+error: aborting due to 2 previous errors; 6 warnings emitted
+
+For more information about this error, try `rustc --explain E0038`.

tests/ui/suggestions/object-unsafe-trait-should-use-self-2021-without-dyn.rs

@@ -4,11 +4,15 @@ trait A: Sized {
     fn f(a: A) -> A;
     //~^ ERROR trait objects must include the `dyn` keyword
     //~| ERROR trait objects must include the `dyn` keyword
+    //~| ERROR associated item referring to unboxed trait object for its own trait
+    //~| ERROR the trait `A` cannot be made into an object
 }
 trait B {
     fn f(a: B) -> B;
     //~^ ERROR trait objects must include the `dyn` keyword
     //~| ERROR trait objects must include the `dyn` keyword
+    //~| ERROR associated item referring to unboxed trait object for its own trait
+    //~| ERROR the trait `B` cannot be made into an object
 }
 trait C {
     fn f(&self, a: C) -> C;

tests/ui/suggestions/object-unsafe-trait-should-use-self-2021-without-dyn.stderr

@@ -1,3 +1,65 @@
+error: associated item referring to unboxed trait object for its own trait
+  --> $DIR/object-unsafe-trait-should-use-self-2021-without-dyn.rs:4:13
+   |
+LL | trait A: Sized {
+   |       - in this trait
+LL |     fn f(a: A) -> A;
+   |             ^     ^
+   |
+help: you might have meant to use `Self` to refer to the implementing type
+   |
+LL |     fn f(a: Self) -> Self;
+   |             ~~~~     ~~~~
+
+error[E0038]: the trait `A` cannot be made into an object
+  --> $DIR/object-unsafe-trait-should-use-self-2021-without-dyn.rs:4:13
+   |
+LL |     fn f(a: A) -> A;
+   |             ^ `A` cannot be made into an object
+   |
+note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
+  --> $DIR/object-unsafe-trait-should-use-self-2021-without-dyn.rs:3:10
+   |
+LL | trait A: Sized {
+   |       -  ^^^^^ ...because it requires `Self: Sized`
+   |       |
+   |       this trait cannot be made into an object...
+
+error: associated item referring to unboxed trait object for its own trait
+  --> $DIR/object-unsafe-trait-should-use-self-2021-without-dyn.rs:11:13
+   |
+LL | trait B {
+   |       - in this trait
+LL |     fn f(a: B) -> B;
+   |             ^     ^
+   |
+help: you might have meant to use `Self` to refer to the implementing type
+   |
+LL |     fn f(a: Self) -> Self;
+   |             ~~~~     ~~~~
+
+error[E0038]: the trait `B` cannot be made into an object
+  --> $DIR/object-unsafe-trait-should-use-self-2021-without-dyn.rs:11:13
+   |
+LL |     fn f(a: B) -> B;
+   |             ^ `B` cannot be made into an object
+   |
+note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
+  --> $DIR/object-unsafe-trait-should-use-self-2021-without-dyn.rs:11:8
+   |
+LL | trait B {
+   |       - this trait cannot be made into an object...
+LL |     fn f(a: B) -> B;
+   |        ^ ...because associated function `f` has no `self` parameter
+help: consider turning `f` into a method by giving it a `&self` argument
+   |
+LL |     fn f(&self, a: B) -> B;
+   |          ++++++
+help: alternatively, consider constraining `f` so it does not apply to trait objects
+   |
+LL |     fn f(a: B) -> B where Self: Sized;
+   |                     +++++++++++++++++
+
 error[E0782]: trait objects must include the `dyn` keyword
   --> $DIR/object-unsafe-trait-should-use-self-2021-without-dyn.rs:4:13
    |
@@ -33,7 +95,7 @@ LL |     fn f(a: A) -> Box<dyn A>;
    |                   +++++++  +
 
 error[E0782]: trait objects must include the `dyn` keyword
-  --> $DIR/object-unsafe-trait-should-use-self-2021-without-dyn.rs:9:13
+  --> $DIR/object-unsafe-trait-should-use-self-2021-without-dyn.rs:11:13
    |
 LL |     fn f(a: B) -> B;
    |             ^
@@ -52,7 +114,7 @@ LL |     fn f(a: &dyn B) -> B;
    |             ++++
 
 error[E0782]: trait objects must include the `dyn` keyword
-  --> $DIR/object-unsafe-trait-should-use-self-2021-without-dyn.rs:9:19
+  --> $DIR/object-unsafe-trait-should-use-self-2021-without-dyn.rs:11:19
    |
 LL |     fn f(a: B) -> B;
    |                   ^
@@ -67,7 +129,7 @@ LL |     fn f(a: B) -> Box<dyn B>;
    |                   +++++++  +
 
 error[E0782]: trait objects must include the `dyn` keyword
-  --> $DIR/object-unsafe-trait-should-use-self-2021-without-dyn.rs:14:20
+  --> $DIR/object-unsafe-trait-should-use-self-2021-without-dyn.rs:18:20
    |
 LL |     fn f(&self, a: C) -> C;
    |                    ^
@@ -86,7 +148,7 @@ LL |     fn f(&self, a: &dyn C) -> C;
    |                    ++++
 
 error[E0782]: trait objects must include the `dyn` keyword
-  --> $DIR/object-unsafe-trait-should-use-self-2021-without-dyn.rs:14:26
+  --> $DIR/object-unsafe-trait-should-use-self-2021-without-dyn.rs:18:26
    |
 LL |     fn f(&self, a: C) -> C;
    |                          ^
@@ -100,6 +162,7 @@ help: alternatively, you can return an owned trait object
 LL |     fn f(&self, a: C) -> Box<dyn C>;
    |                          +++++++  +
 
-error: aborting due to 6 previous errors
+error: aborting due to 10 previous errors
 
-For more information about this error, try `rustc --explain E0782`.
+Some errors have detailed explanations: E0038, E0782.
+For more information about an error, try `rustc --explain E0038`.