Avoid ICE: Check diagnostic is error before downgrading

Fix rust-lang#119633.

compiler/rustc_hir_analysis/src/astconv/lint.rs

@@ -122,7 +122,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
                     ],
                     Applicability::MachineApplicable,
                 );
-            } else {
+            } else if diag.is_error() {
                 // We'll emit the object safety error already, with a structured suggestion.
                 diag.downgrade_to_delayed_bug();
             }
@@ -148,8 +148,10 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
             }
             if !is_object_safe {
                 diag.note(format!("`{trait_name}` it is not object safe, so it can't be `dyn`"));
-                // We'll emit the object safety error already, with a structured suggestion.
-                diag.downgrade_to_delayed_bug();
+                if diag.is_error() {
+                    // We'll emit the object safety error already, with a structured suggestion.
+                    diag.downgrade_to_delayed_bug();
+                }
             } else {
                 let sugg = if let hir::TyKind::TraitObject([_, _, ..], _, _) = self_ty.kind {
                     // There are more than one trait bound, we need surrounding parentheses.

tests/ui/object-safety/avoid-ice-on-warning-2.rs

@@ -0,0 +1,9 @@
+fn id<F>(f: Copy) -> usize {
+//~^ WARN trait objects without an explicit `dyn` are deprecated
+//~| WARN this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
+//~| WARN trait objects without an explicit `dyn` are deprecated
+//~| WARN this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
+//~| ERROR the trait `Copy` cannot be made into an object
+    f()
+}
+fn main() {}

tests/ui/object-safety/avoid-ice-on-warning-2.stderr

@@ -0,0 +1,50 @@
+warning: trait objects without an explicit `dyn` are deprecated
+  --> $DIR/avoid-ice-on-warning-2.rs:1:13
+   |
+LL | fn id<F>(f: Copy) -> usize {
+   |             ^^^^
+   |
+   = 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: `Copy` 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 `Copy`
+   |
+LL | fn id<F, T: Copy>(f: T) -> usize {
+   |        +++++++++     ~
+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 | fn id<F>(f: impl Copy) -> usize {
+   |             ++++
+
+warning: trait objects without an explicit `dyn` are deprecated
+  --> $DIR/avoid-ice-on-warning-2.rs:1:13
+   |
+LL | fn id<F>(f: Copy) -> usize {
+   |             ^^^^
+   |
+   = 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: `Copy` 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 `Copy`
+   |
+LL | fn id<F, T: Copy>(f: T) -> usize {
+   |        +++++++++     ~
+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 | fn id<F>(f: impl Copy) -> usize {
+   |             ++++
+
+error[E0038]: the trait `Copy` cannot be made into an object
+  --> $DIR/avoid-ice-on-warning-2.rs:1:13
+   |
+LL | fn id<F>(f: Copy) -> usize {
+   |             ^^^^ `Copy` cannot be made into an object
+   |
+   = note: the trait cannot be made into an object because it requires `Self: Sized`
+   = 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>
+
+error: aborting due to 1 previous error; 2 warnings emitted
+
+For more information about this error, try `rustc --explain E0038`.

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

@@ -0,0 +1,6 @@
+fn call_this<F>(f: F) : Fn(&str) + call_that {}
+//~^ ERROR return types are denoted using `->`
+//~| ERROR cannot find trait `call_that` in this scope
+//~| WARN trait objects without an explicit `dyn` are deprecated
+//~| WARN this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
+fn main() {}

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

@@ -0,0 +1,29 @@
+error: return types are denoted using `->`
+  --> $DIR/avoid-ice-on-warning.rs:1:23
+   |
+LL | fn call_this<F>(f: F) : Fn(&str) + call_that {}
+   |                       ^ help: use `->` instead
+
+error[E0405]: cannot find trait `call_that` in this scope
+  --> $DIR/avoid-ice-on-warning.rs:1:36
+   |
+LL | fn call_this<F>(f: F) : Fn(&str) + call_that {}
+   |                                    ^^^^^^^^^ not found in this scope
+
+warning: trait objects without an explicit `dyn` are deprecated
+  --> $DIR/avoid-ice-on-warning.rs:1:25
+   |
+LL | fn call_this<F>(f: F) : Fn(&str) + call_that {}
+   |                         ^^^^^^^^^^^^^^^^^^^^
+   |
+   = 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: `#[warn(bare_trait_objects)]` on by default
+help: `Fn(&str) + call_that` is not object safe, use `impl Fn(&str) + call_that` to return an opaque type, as long as you return a single underlying type
+   |
+LL | fn call_this<F>(f: F) : impl Fn(&str) + call_that {}
+   |                         ++++
+
+error: aborting due to 2 previous errors; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0405`.