Update tests

compiler/rustc_span/src/source_map/tests.rs

@@ -1,5 +1,7 @@
 use super::*;
 
+use rustc_data_structures::sync::FreezeLock;
+
 fn init_source_map() -> SourceMap {
     let sm = SourceMap::new(FilePathMapping::empty());
     sm.new_source_file(PathBuf::from("blork.rs").into(), "first line.\nsecond line".to_string());
@@ -263,53 +265,6 @@ fn t10() {
     );
 }
 
-/// Returns the span corresponding to the `n`th occurrence of `substring` in `source_text`.
-trait SourceMapExtension {
-    fn span_substr(
-        &self,
-        file: &Lrc<SourceFile>,
-        source_text: &str,
-        substring: &str,
-        n: usize,
-    ) -> Span;
-}
-
-impl SourceMapExtension for SourceMap {
-    fn span_substr(
-        &self,
-        file: &Lrc<SourceFile>,
-        source_text: &str,
-        substring: &str,
-        n: usize,
-    ) -> Span {
-        eprintln!(
-            "span_substr(file={:?}/{:?}, substring={:?}, n={})",
-            file.name, file.start_pos, substring, n
-        );
-        let mut i = 0;
-        let mut hi = 0;
-        loop {
-            let offset = source_text[hi..].find(substring).unwrap_or_else(|| {
-                panic!(
-                    "source_text `{}` does not have {} occurrences of `{}`, only {}",
-                    source_text, n, substring, i
-                );
-            });
-            let lo = hi + offset;
-            hi = lo + substring.len();
-            if i == n {
-                let span = Span::with_root_ctxt(
-                    BytePos(lo as u32 + file.start_pos.0),
-                    BytePos(hi as u32 + file.start_pos.0),
-                );
-                assert_eq!(&self.span_to_snippet(span).unwrap()[..], substring);
-                return span;
-            }
-            i += 1;
-        }
-    }
-}
-
 // Takes a unix-style path and returns a platform specific path.
 fn path(p: &str) -> PathBuf {
     path_str(p).into()

library/core/tests/macros.rs

@@ -1,3 +1,4 @@
+#[allow(dead_code)]
 trait Trait {
     fn blah(&self);
 }

library/std/src/sys_common/mod.rs

@@ -59,12 +59,14 @@ cfg_if::cfg_if! {
 
 /// A trait for viewing representations from std types
 #[doc(hidden)]
+#[allow(dead_code)] // not used on all platforms
 pub trait AsInner<Inner: ?Sized> {
     fn as_inner(&self) -> &Inner;
 }
 
 /// A trait for viewing representations from std types
 #[doc(hidden)]
+#[allow(dead_code)] // not used on all platforms
 pub trait AsInnerMut<Inner: ?Sized> {
     fn as_inner_mut(&mut self) -> &mut Inner;
 }

src/tools/miri/tests/fail/dyn-call-trait-mismatch.rs

@@ -1,4 +1,5 @@
 trait T1 {
+    #[allow(dead_code)]
     fn method1(self: Box<Self>);
 }
 trait T2 {

src/tools/miri/tests/fail/dyn-upcast-trait-mismatch.rs

@@ -2,30 +2,36 @@
 #![allow(incomplete_features)]
 
 trait Foo: PartialEq<i32> + std::fmt::Debug + Send + Sync {
+    #[allow(dead_code)]
     fn a(&self) -> i32 {
         10
     }
 
+    #[allow(dead_code)]
     fn z(&self) -> i32 {
         11
     }
 
+    #[allow(dead_code)]
     fn y(&self) -> i32 {
         12
     }
 }
 
 trait Bar: Foo {
+    #[allow(dead_code)]
     fn b(&self) -> i32 {
         20
     }
 
+    #[allow(dead_code)]
     fn w(&self) -> i32 {
         21
     }
 }
 
 trait Baz: Bar {
+    #[allow(dead_code)]
     fn c(&self) -> i32 {
         30
     }

src/tools/miri/tests/pass/cast-rfc0401-vtable-kinds.rs

@@ -9,6 +9,7 @@ trait Foo<T> {
     }
 }
 
+#[allow(dead_code)]
 trait Bar {
     fn bar(&self) {
         println!("Bar!");

src/tools/miri/tests/pass/dyn-upcast.rs

@@ -383,14 +383,17 @@ fn struct_() {
 
 fn replace_vptr() {
     trait A {
+        #[allow(dead_code)]
         fn foo_a(&self);
     }
 
     trait B {
+        #[allow(dead_code)]
         fn foo_b(&self);
     }
 
     trait C: A + B {
+        #[allow(dead_code)]
         fn foo_c(&self);
     }
 

src/tools/miri/tests/pass/weak_memory/weak.rs

@@ -11,6 +11,7 @@ use std::sync::atomic::Ordering::*;
 use std::sync::atomic::{fence, AtomicUsize};
 use std::thread::spawn;
 
+#[allow(dead_code)]
 #[derive(Copy, Clone)]
 struct EvilSend<T>(pub T);
 

src/tools/tidy/src/ui_tests.rs

@@ -13,8 +13,9 @@ use std::path::{Path, PathBuf};
 // desirable, because large numbers of files are unwieldy in general. See issue
 // #73494.
 const ENTRY_LIMIT: usize = 900;
-const ISSUES_ENTRY_LIMIT: usize = 1807;
-const ROOT_ENTRY_LIMIT: usize = 868;
+// FIXME: The following limits should be reduced eventually.
+const ISSUES_ENTRY_LIMIT: usize = 1819;
+const ROOT_ENTRY_LIMIT: usize = 870;
 
 const EXPECTED_TEST_FILE_EXTENSIONS: &[&str] = &[
     "rs",     // test source files

tests/codegen-units/item-collection/instantiation-through-vtable.rs

@@ -26,7 +26,9 @@ fn start(_: isize, _: *const *const u8) -> isize {
     //~ MONO_ITEM fn std::ptr::drop_in_place::<Struct<u32>> - shim(None) @@ instantiation_through_vtable-cgu.0[Internal]
     //~ MONO_ITEM fn <Struct<u32> as Trait>::foo
     //~ MONO_ITEM fn <Struct<u32> as Trait>::bar
-    let _ = &s1 as &Trait;
+    let r1 = &s1 as &Trait;
+    r1.foo();
+    r1.bar();
 
     let s1 = Struct { _a: 0u64 };
     //~ MONO_ITEM fn std::ptr::drop_in_place::<Struct<u64>> - shim(None) @@ instantiation_through_vtable-cgu.0[Internal]

tests/codegen-units/item-collection/trait-method-default-impl.rs

@@ -57,5 +57,8 @@ fn start(_: isize, _: *const *const u8) -> isize {
     //~ MONO_ITEM fn <u32 as SomeGenericTrait<i16>>::bar::<()>
     0u32.bar(0i16, ());
 
+    0i8.foo();
+    0i32.foo();
+
     0
 }

tests/codegen-units/item-collection/unsizing.rs

@@ -75,5 +75,7 @@ fn start(_: isize, _: *const *const u8) -> isize {
     //~ MONO_ITEM fn <u32 as Trait>::foo
     let _wrapper_sized = wrapper_sized as Wrapper<Trait>;
 
+    false.foo();
+
     0
 }

tests/ui-fulldeps/rustc_encodable_hygiene.rs

@@ -1,4 +1,4 @@
-// run-pass
+// check-pass
 
 #![feature(rustc_private)]
 

tests/ui/anon-params/anon-params-deprecated.fixed

@@ -5,6 +5,7 @@
 // edition:2015
 // run-rustfix
 
+#[allow(dead_code)]
 trait T {
     fn foo(_: i32); //~ WARNING anonymous parameters are deprecated
                  //~| WARNING this is accepted in the current edition

tests/ui/anon-params/anon-params-deprecated.rs

@@ -5,6 +5,7 @@
 // edition:2015
 // run-rustfix
 
+#[allow(dead_code)]
 trait T {
     fn foo(i32); //~ WARNING anonymous parameters are deprecated
                  //~| WARNING this is accepted in the current edition

tests/ui/anon-params/anon-params-deprecated.stderr

@@ -1,5 +1,5 @@
 warning: anonymous parameters are deprecated and will be removed in the next edition
-  --> $DIR/anon-params-deprecated.rs:9:12
+  --> $DIR/anon-params-deprecated.rs:10:12
    |
 LL |     fn foo(i32);
    |            ^^^ help: try naming the parameter or explicitly ignoring it: `_: i32`
@@ -13,7 +13,7 @@ LL | #![warn(anonymous_parameters)]
    |         ^^^^^^^^^^^^^^^^^^^^
 
 warning: anonymous parameters are deprecated and will be removed in the next edition
-  --> $DIR/anon-params-deprecated.rs:12:30
+  --> $DIR/anon-params-deprecated.rs:13:30
    |
 LL |     fn bar_with_default_impl(String, String) {}
    |                              ^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: String`
@@ -22,7 +22,7 @@ LL |     fn bar_with_default_impl(String, String) {}
    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
 
 warning: anonymous parameters are deprecated and will be removed in the next edition
-  --> $DIR/anon-params-deprecated.rs:12:38
+  --> $DIR/anon-params-deprecated.rs:13:38
    |
 LL |     fn bar_with_default_impl(String, String) {}
    |                                      ^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: String`

tests/ui/associated-consts/associated-const-outer-ty-refs.rs

@@ -1,4 +1,5 @@
-// run-pass
+// check-pass
+
 trait Lattice {
     const BOTTOM: Self;
 }

tests/ui/associated-consts/associated-const-type-parameters.rs

@@ -27,7 +27,7 @@ fn sub<A: Foo, B: Foo>() -> i32 {
     A::X - B::X
 }
 
-trait Bar: Foo {
+trait Bar: Foo { //~ WARN trait `Bar` is never used
     const Y: i32 = Self::X;
 }
 

tests/ui/associated-consts/associated-const-type-parameters.stderr

@@ -0,0 +1,10 @@
+warning: trait `Bar` is never used
+  --> $DIR/associated-const-type-parameters.rs:30:7
+   |
+LL | trait Bar: Foo {
+   |       ^^^
+   |
+   = note: `#[warn(dead_code)]` on by default
+
+warning: 1 warning emitted
+

tests/ui/associated-type-bounds/dyn-impl-trait-type.rs

@@ -5,7 +5,7 @@
 use std::ops::Add;
 
 trait Tr1 { type As1; fn mk(&self) -> Self::As1; }
-trait Tr2<'a> { fn tr2(self) -> &'a Self; }
+trait Tr2<'a> { fn tr2(self) -> &'a Self; } //~ WARN method `tr2` is never used
 
 fn assert_copy<T: Copy>(x: T) { let _x = x; let _x = x; }
 fn assert_static<T: 'static>(_: T) {}

tests/ui/associated-type-bounds/dyn-impl-trait-type.stderr

@@ -0,0 +1,12 @@
+warning: method `tr2` is never used
+  --> $DIR/dyn-impl-trait-type.rs:8:20
+   |
+LL | trait Tr2<'a> { fn tr2(self) -> &'a Self; }
+   |       ---          ^^^
+   |       |
+   |       method in this trait
+   |
+   = note: `#[warn(dead_code)]` on by default
+
+warning: 1 warning emitted
+

tests/ui/associated-type-bounds/dyn-rpit-and-let.rs

@@ -7,7 +7,7 @@
 use std::ops::Add;
 
 trait Tr1 { type As1; fn mk(&self) -> Self::As1; }
-trait Tr2<'a> { fn tr2(self) -> &'a Self; }
+trait Tr2<'a> { fn tr2(self) -> &'a Self; } //~ WARN method `tr2` is never used
 
 fn assert_copy<T: Copy>(x: T) { let _x = x; let _x = x; }
 fn assert_static<T: 'static>(_: T) {}

tests/ui/associated-type-bounds/dyn-rpit-and-let.stderr

@@ -0,0 +1,12 @@
+warning: method `tr2` is never used
+  --> $DIR/dyn-rpit-and-let.rs:10:20
+   |
+LL | trait Tr2<'a> { fn tr2(self) -> &'a Self; }
+   |       ---          ^^^
+   |       |
+   |       method in this trait
+   |
+   = note: `#[warn(dead_code)]` on by default
+
+warning: 1 warning emitted
+

tests/ui/associated-type-bounds/rpit.rs

@@ -5,7 +5,7 @@
 use std::ops::Add;
 
 trait Tr1 { type As1; fn mk(self) -> Self::As1; }
-trait Tr2<'a> { fn tr2(self) -> &'a Self; }
+trait Tr2<'a> { fn tr2(self) -> &'a Self; } //~ WARN method `tr2` is never used
 
 fn assert_copy<T: Copy>(x: T) { let _x = x; let _x = x; }
 fn assert_static<T: 'static>(_: T) {}

tests/ui/associated-type-bounds/rpit.stderr

@@ -0,0 +1,12 @@
+warning: method `tr2` is never used
+  --> $DIR/rpit.rs:8:20
+   |
+LL | trait Tr2<'a> { fn tr2(self) -> &'a Self; }
+   |       ---          ^^^
+   |       |
+   |       method in this trait
+   |
+   = note: `#[warn(dead_code)]` on by default
+
+warning: 1 warning emitted
+

tests/ui/associated-type-bounds/suggest-contraining-assoc-type-because-of-assoc-const.fixed

@@ -1,4 +1,5 @@
 // run-rustfix
+#![allow(dead_code)]
 trait O {
     type M;
 }

tests/ui/associated-type-bounds/suggest-contraining-assoc-type-because-of-assoc-const.rs

@@ -1,4 +1,5 @@
 // run-rustfix
+#![allow(dead_code)]
 trait O {
     type M;
 }

tests/ui/associated-type-bounds/suggest-contraining-assoc-type-because-of-assoc-const.stderr

@@ -1,5 +1,5 @@
 error[E0308]: mismatched types
-  --> $DIR/suggest-contraining-assoc-type-because-of-assoc-const.rs:12:21
+  --> $DIR/suggest-contraining-assoc-type-because-of-assoc-const.rs:13:21
    |
 LL |     const N: C::M = 4u8;
    |                     ^^^ expected associated type, found `u8`

tests/ui/associated-type-bounds/trait-alias-impl-trait.rs

@@ -1,5 +1,6 @@
 // run-pass
 
+#![allow(dead_code)]
 #![feature(associated_type_bounds)]
 #![feature(type_alias_impl_trait)]
 

tests/ui/associated-types/associated-types-for-unimpl-trait.fixed

@@ -1,4 +1,5 @@
 // run-rustfix
+#![allow(dead_code)]
 #![allow(unused_variables)]
 
 trait Get {

tests/ui/associated-types/associated-types-for-unimpl-trait.rs

@@ -1,4 +1,5 @@
 // run-rustfix
+#![allow(dead_code)]
 #![allow(unused_variables)]
 
 trait Get {

tests/ui/associated-types/associated-types-for-unimpl-trait.stderr

@@ -1,5 +1,5 @@
 error[E0277]: the trait bound `Self: Get` is not satisfied
-  --> $DIR/associated-types-for-unimpl-trait.rs:10:40
+  --> $DIR/associated-types-for-unimpl-trait.rs:11:40
    |
 LL |     fn uhoh<U:Get>(&self, foo: U, bar: <Self as Get>::Value) {}
    |                                        ^^^^^^^^^^^^^^^^^^^^ the trait `Get` is not implemented for `Self`

tests/ui/associated-types/associated-types-in-bound-type-arg.rs

@@ -1,4 +1,4 @@
-// run-pass
+// check-pass
 // Test the case where we resolve `C::Result` and the trait bound
 // itself includes a `Self::Item` shorthand.
 //

tests/ui/associated-types/associated-types-issue-20220.rs

@@ -4,7 +4,7 @@
 
 use std::vec;
 
-trait IntoIteratorX {
+trait IntoIteratorX { //~ WARN trait `IntoIteratorX` is never used
     type Item;
     type IntoIter: Iterator<Item=Self::Item>;
 

tests/ui/associated-types/associated-types-issue-20220.stderr

@@ -0,0 +1,10 @@
+warning: trait `IntoIteratorX` is never used
+  --> $DIR/associated-types-issue-20220.rs:7:7
+   |
+LL | trait IntoIteratorX {
+   |       ^^^^^^^^^^^^^
+   |
+   = note: `#[warn(dead_code)]` on by default
+
+warning: 1 warning emitted
+

tests/ui/associated-types/associated-types-issue-20371.rs

@@ -1,4 +1,4 @@
-// run-pass
+// check-pass
 // Test that we are able to have an impl that defines an associated type
 // before the actual trait.
 

tests/ui/associated-types/associated-types-nested-projections.rs

@@ -13,7 +13,7 @@ impl<'a> Bound for &'a i32 {}
 trait IntoIterator {
     type Iter: Iterator;
 
-    fn into_iter(self) -> Self::Iter;
+    fn into_iter(self) -> Self::Iter; //~ WARN method `into_iter` is never used
 }
 
 impl<'a, T> IntoIterator for &'a [T; 3] {

tests/ui/associated-types/associated-types-nested-projections.stderr

@@ -0,0 +1,13 @@
+warning: method `into_iter` is never used
+  --> $DIR/associated-types-nested-projections.rs:16:8
+   |
+LL | trait IntoIterator {
+   |       ------------ method in this trait
+...
+LL |     fn into_iter(self) -> Self::Iter;
+   |        ^^^^^^^^^
+   |
+   = note: `#[warn(dead_code)]` on by default
+
+warning: 1 warning emitted
+

tests/ui/associated-types/associated-types-normalize-in-bounds-ufcs.rs

@@ -1,4 +1,4 @@
-// run-pass
+// check-pass
 #![allow(unused_variables)]
 // Test that we normalize associated types that appear in bounds; if
 // we didn't, the call to `self.split2()` fails to type check.

tests/ui/associated-types/associated-types-normalize-in-bounds.rs

@@ -1,4 +1,4 @@
-// run-pass
+// check-pass
 #![allow(unused_variables)]
 // Test that we normalize associated types that appear in bounds; if
 // we didn't, the call to `self.split2()` fails to type check.

tests/ui/associated-types/associated-types-projection-bound-in-supertraits.rs

@@ -1,4 +1,4 @@
-// run-pass
+// check-pass
 #![allow(unused_variables)]
 // Test that we correctly handle projection bounds appearing in the
 // supertrait list (and in conjunction with overloaded operators). In

tests/ui/associated-types/associated-types-projection-from-known-type-in-impl.rs

@@ -6,7 +6,7 @@ trait Int
 {
     type T;
 
-    fn dummy(&self) { }
+    fn dummy(&self) { } //~ WARN method `dummy` is never used
 }
 
 trait NonZero

tests/ui/associated-types/associated-types-projection-from-known-type-in-impl.stderr

@@ -0,0 +1,13 @@
+warning: method `dummy` is never used
+  --> $DIR/associated-types-projection-from-known-type-in-impl.rs:9:8
+   |
+LL | trait Int
+   |       --- method in this trait
+...
+LL |     fn dummy(&self) { }
+   |        ^^^^^
+   |
+   = note: `#[warn(dead_code)]` on by default
+
+warning: 1 warning emitted
+

tests/ui/associated-types/associated-types-projection-to-unrelated-trait-in-method-without-default.fixed

@@ -2,6 +2,7 @@
 // Check that we get an error when you use `<Self as Get>::Value` in
 // the trait definition even if there is no default method.
 
+#![allow(dead_code)]
 trait Get {
     type Value;
 }

tests/ui/associated-types/associated-types-projection-to-unrelated-trait-in-method-without-default.rs

@@ -2,6 +2,7 @@
 // Check that we get an error when you use `<Self as Get>::Value` in
 // the trait definition even if there is no default method.
 
+#![allow(dead_code)]
 trait Get {
     type Value;
 }

tests/ui/associated-types/associated-types-projection-to-unrelated-trait-in-method-without-default.stderr

@@ -1,5 +1,5 @@
 error[E0277]: the trait bound `Self: Get` is not satisfied
-  --> $DIR/associated-types-projection-to-unrelated-trait-in-method-without-default.rs:10:40
+  --> $DIR/associated-types-projection-to-unrelated-trait-in-method-without-default.rs:11:40
    |
 LL |     fn okay<U:Get>(&self, foo: U, bar: <Self as Get>::Value);
    |                                        ^^^^^^^^^^^^^^^^^^^^ the trait `Get` is not implemented for `Self`

tests/ui/associated-types/associated-types-projection-to-unrelated-trait.rs

@@ -1,4 +1,4 @@
-// run-pass
+// check-pass
 // Check that we do not get an error when you use `<Self as Get>::Value` in
 // the trait definition if there is no default method and for every impl,
 // `Self` does implement `Get`.

tests/ui/associated-types/associated-types-qualified-path-with-trait-with-type-parameters.rs

@@ -1,4 +1,4 @@
-// run-pass
+// check-pass
 // pretty-expanded FIXME #23616
 
 trait Foo<T> {

tests/ui/associated-types/associated-types-resolve-lifetime.rs

@@ -1,4 +1,4 @@
-// run-pass
+// check-pass
 // pretty-expanded FIXME #23616
 
 trait Get<T> {

tests/ui/associated-types/impl-wf-cycle-5.fixed

@@ -1,9 +1,11 @@
 // run-rustfix
 
+#[allow(dead_code)]
 trait Baz {}
 impl Baz for () {}
 impl<T> Baz for (T,) {}
 
+#[allow(dead_code)]
 trait Fiz {}
 impl Fiz for bool {}
 

tests/ui/associated-types/impl-wf-cycle-5.rs

@@ -1,9 +1,11 @@
 // run-rustfix
 
+#[allow(dead_code)]
 trait Baz {}
 impl Baz for () {}
 impl<T> Baz for (T,) {}
 
+#[allow(dead_code)]
 trait Fiz {}
 impl Fiz for bool {}
 

tests/ui/associated-types/impl-wf-cycle-5.stderr

@@ -1,5 +1,5 @@
 error[E0275]: overflow evaluating the requirement `<(T,) as Grault>::A == _`
-  --> $DIR/impl-wf-cycle-5.rs:20:1
+  --> $DIR/impl-wf-cycle-5.rs:22:1
    |
 LL | / impl<T> Grault for (T,)
 LL | |
@@ -12,7 +12,7 @@ LL |       type A = ();
    |       ------ associated type `<(T,) as Grault>::A` is specified here
    |
 note: required for `(T,)` to implement `Grault`
-  --> $DIR/impl-wf-cycle-5.rs:20:9
+  --> $DIR/impl-wf-cycle-5.rs:22:9
    |
 LL | impl<T> Grault for (T,)
    |         ^^^^^^     ^^^^

tests/ui/associated-types/impl-wf-cycle-6.fixed

@@ -1,9 +1,11 @@
 // run-rustfix
 
+#[allow(dead_code)]
 trait Baz {}
 impl Baz for () {}
 impl<T> Baz for (T,) {}
 
+#[allow(dead_code)]
 trait Fiz {}
 impl Fiz for bool {}
 

tests/ui/associated-types/impl-wf-cycle-6.rs

@@ -1,9 +1,11 @@
 // run-rustfix
 
+#[allow(dead_code)]
 trait Baz {}
 impl Baz for () {}
 impl<T> Baz for (T,) {}
 
+#[allow(dead_code)]
 trait Fiz {}
 impl Fiz for bool {}
 

tests/ui/associated-types/impl-wf-cycle-6.stderr

@@ -1,5 +1,5 @@
 error[E0275]: overflow evaluating the requirement `<(T,) as Grault>::A == _`
-  --> $DIR/impl-wf-cycle-6.rs:20:1
+  --> $DIR/impl-wf-cycle-6.rs:22:1
    |
 LL | / impl<T: Grault> Grault for (T,)
 LL | |
@@ -11,7 +11,7 @@ LL |       type A = ();
    |       ------ associated type `<(T,) as Grault>::A` is specified here
    |
 note: required for `(T,)` to implement `Grault`
-  --> $DIR/impl-wf-cycle-6.rs:20:17
+  --> $DIR/impl-wf-cycle-6.rs:22:17
    |
 LL | impl<T: Grault> Grault for (T,)
    |                 ^^^^^^     ^^^^

tests/ui/auto-traits/auto-trait-validation.fixed

@@ -1,4 +1,5 @@
 #![feature(auto_traits)]
+#![allow(dead_code)]
 
 // run-rustfix
 

tests/ui/auto-traits/auto-trait-validation.rs

@@ -1,4 +1,5 @@
 #![feature(auto_traits)]
+#![allow(dead_code)]
 
 // run-rustfix
 

tests/ui/auto-traits/auto-trait-validation.stderr

@@ -1,5 +1,5 @@
 error[E0567]: auto traits cannot have generic parameters
-  --> $DIR/auto-trait-validation.rs:5:19
+  --> $DIR/auto-trait-validation.rs:6:19
    |
 LL | auto trait Generic<T> {}
    |            -------^^^ help: remove the parameters
@@ -7,7 +7,7 @@ LL | auto trait Generic<T> {}
    |            auto trait cannot have generic parameters
 
 error[E0568]: auto traits cannot have super traits or lifetime bounds
-  --> $DIR/auto-trait-validation.rs:7:17
+  --> $DIR/auto-trait-validation.rs:8:17
    |
 LL | auto trait Bound : Copy {}
    |            -----^^^^^^^ help: remove the super traits or lifetime bounds
@@ -15,7 +15,7 @@ LL | auto trait Bound : Copy {}
    |            auto traits cannot have super traits or lifetime bounds
 
 error[E0568]: auto traits cannot have super traits or lifetime bounds
-  --> $DIR/auto-trait-validation.rs:9:25
+  --> $DIR/auto-trait-validation.rs:10:25
    |
 LL | auto trait LifetimeBound : 'static {}
    |            -------------^^^^^^^^^^ help: remove the super traits or lifetime bounds
@@ -23,7 +23,7 @@ LL | auto trait LifetimeBound : 'static {}
    |            auto traits cannot have super traits or lifetime bounds
 
 error[E0380]: auto traits cannot have associated items
-  --> $DIR/auto-trait-validation.rs:11:25
+  --> $DIR/auto-trait-validation.rs:12:25
    |
 LL | auto trait MyTrait { fn foo() {} }
    |            -------   ---^^^-----

tests/ui/auto-traits/auto-traits.rs

@@ -19,8 +19,8 @@ fn take_auto_unsafe<T: AutoUnsafe>(_: T) {}
 
 fn main() {
     // Parse inside functions.
-    auto trait AutoInner {}
-    unsafe auto trait AutoUnsafeInner {}
+    auto trait AutoInner {} //~ WARN trait `AutoInner` is never used
+    unsafe auto trait AutoUnsafeInner {} //~ WARN trait `AutoUnsafeInner` is never used
 
     take_auto(0);
     take_auto(AutoBool(true));

tests/ui/auto-traits/auto-traits.stderr

@@ -0,0 +1,16 @@
+warning: trait `AutoInner` is never used
+  --> $DIR/auto-traits.rs:22:16
+   |
+LL |     auto trait AutoInner {}
+   |                ^^^^^^^^^
+   |
+   = note: `#[warn(dead_code)]` on by default
+
+warning: trait `AutoUnsafeInner` is never used
+  --> $DIR/auto-traits.rs:23:23
+   |
+LL |     unsafe auto trait AutoUnsafeInner {}
+   |                       ^^^^^^^^^^^^^^^
+
+warning: 2 warnings emitted
+

tests/ui/builtin-superkinds/builtin-superkinds-in-metadata2.rs

@@ -1,4 +1,4 @@
-// run-pass
+// check-pass
 
 #![allow(unused_imports)]
 

tests/ui/builtin-superkinds/builtin-superkinds-simple2.rs

@@ -1,4 +1,4 @@
-// run-pass
+// check-pass
 // Simple test case of implementing a trait with super-builtin-kinds.
 
 // pretty-expanded FIXME #23616

tests/ui/builtin-superkinds/builtin-superkinds-typaram.rs

@@ -1,4 +1,4 @@
-// run-pass
+// check-pass
 // Tests correct implementation of traits with super-builtin-kinds
 // using a bounded type parameter.
 

tests/ui/cast/cast-rfc0401-vtable-kinds.rs

@@ -8,7 +8,7 @@ trait Foo<T> {
     fn foo(&self, _: T) -> u32 { 42 }
 }
 
-trait Bar {
+trait Bar { //~ WARN trait `Bar` is never used
     fn bar(&self) { println!("Bar!"); }
 }
 

tests/ui/cast/cast-rfc0401-vtable-kinds.stderr

@@ -0,0 +1,10 @@
+warning: trait `Bar` is never used
+  --> $DIR/cast-rfc0401-vtable-kinds.rs:11:7
+   |
+LL | trait Bar {
+   |       ^^^
+   |
+   = note: `#[warn(dead_code)]` on by default
+
+warning: 1 warning emitted
+

tests/ui/cast/fat-ptr-cast-rpass.rs

@@ -3,7 +3,7 @@
 #![feature(ptr_metadata)]
 
 trait Foo {
-    fn foo(&self) {}
+    fn foo(&self) {} //~ WARN method `foo` is never used
 }
 
 struct Bar;

tests/ui/cast/fat-ptr-cast-rpass.stderr

@@ -0,0 +1,12 @@
+warning: method `foo` is never used
+  --> $DIR/fat-ptr-cast-rpass.rs:6:8
+   |
+LL | trait Foo {
+   |       --- method in this trait
+LL |     fn foo(&self) {}
+   |        ^^^
+   |
+   = note: `#[warn(dead_code)]` on by default
+
+warning: 1 warning emitted
+

tests/ui/coercion/issue-14589.rs

@@ -19,6 +19,6 @@ impl<T> Test<T> {
     fn send(&self, _: T) {}
 }
 
-trait Foo { fn dummy(&self) { }}
+trait Foo { fn dummy(&self) { }} //~ WARN method `dummy` is never used
 struct Output(#[allow(dead_code)] isize);
 impl Foo for Output {}

tests/ui/coercion/issue-14589.stderr

@@ -0,0 +1,12 @@
+warning: method `dummy` is never used
+  --> $DIR/issue-14589.rs:22:16
+   |
+LL | trait Foo { fn dummy(&self) { }}
+   |       ---      ^^^^^
+   |       |
+   |       method in this trait
+   |
+   = note: `#[warn(dead_code)]` on by default
+
+warning: 1 warning emitted
+

tests/ui/coherence/coherence-multidispatch-tuple.rs

@@ -1,4 +1,4 @@
-// run-pass
+// check-pass
 #![allow(unused_imports)]
 // pretty-expanded FIXME #23616
 

tests/ui/const-generics/associated-type-bound.rs

@@ -1,4 +1,4 @@
-// run-pass
+// check-pass
 trait Bar<const N: usize> {}
 
 trait Foo<const N: usize> {

tests/ui/const-generics/condition-in-trait-const-arg.rs

@@ -1,5 +1,5 @@
 // Checks that `impl Trait<{anon_const}> for Type` evaluates successfully.
-// run-pass
+// check-pass
 // revisions: full min
 
 #![cfg_attr(full, feature(generic_const_exprs))]

tests/ui/const-generics/dyn-supertraits.rs

@@ -4,7 +4,7 @@ trait Foo<const N: usize> {
     fn myfun(&self) -> usize;
 }
 trait Bar<const N: usize> : Foo<N> {}
-trait Baz: Foo<3> {}
+trait Baz: Foo<3> {} //~ WARN trait `Baz` is never used
 
 struct FooType<const N: usize>;
 struct BarType<const N: usize>;
@@ -23,10 +23,10 @@ impl Foo<3> for BazType {
 impl Baz for BazType {}
 
 trait Foz {}
-trait Boz: Foo<3> + Foz {}
+trait Boz: Foo<3> + Foz {} //~ WARN trait `Boz` is never used
 trait Bok<const N: usize>: Foo<N> + Foz {}
 
-struct FozType;
+struct FozType; //~ WARN struct `FozType` is never constructed
 struct BozType;
 struct BokType<const N: usize>;
 

tests/ui/const-generics/dyn-supertraits.stderr

@@ -0,0 +1,22 @@
+warning: trait `Baz` is never used
+  --> $DIR/dyn-supertraits.rs:7:7
+   |
+LL | trait Baz: Foo<3> {}
+   |       ^^^
+   |
+   = note: `#[warn(dead_code)]` on by default
+
+warning: trait `Boz` is never used
+  --> $DIR/dyn-supertraits.rs:26:7
+   |
+LL | trait Boz: Foo<3> + Foz {}
+   |       ^^^
+
+warning: struct `FozType` is never constructed
+  --> $DIR/dyn-supertraits.rs:29:8
+   |
+LL | struct FozType;
+   |        ^^^^^^^
+
+warning: 3 warnings emitted
+

tests/ui/const-generics/issues/issue-69654-run-pass.rs

@@ -1,5 +1,5 @@
 // run-pass
-trait Bar<T> {}
+trait Bar<T> {} //~ WARN trait `Bar` is never used
 impl<T> Bar<T> for [u8; 7] {}
 
 struct Foo<const N: usize> {}

tests/ui/const-generics/issues/issue-69654-run-pass.stderr

@@ -0,0 +1,10 @@
+warning: trait `Bar` is never used
+  --> $DIR/issue-69654-run-pass.rs:2:7
+   |
+LL | trait Bar<T> {}
+   |       ^^^
+   |
+   = note: `#[warn(dead_code)]` on by default
+
+warning: 1 warning emitted
+

tests/ui/consts/const-block-item.rs

@@ -2,7 +2,7 @@
 #![allow(unused_imports)]
 
 mod foo {
-    pub trait Value {
+    pub trait Value { //~ WARN trait `Value` is never used
         fn value(&self) -> usize;
     }
 }

tests/ui/consts/const-block-item.stderr

@@ -0,0 +1,10 @@
+warning: trait `Value` is never used
+  --> $DIR/const-block-item.rs:5:15
+   |
+LL |     pub trait Value {
+   |               ^^^^^
+   |
+   = note: `#[warn(dead_code)]` on by default
+
+warning: 1 warning emitted
+

tests/ui/consts/underscore_const_names.rs

@@ -2,12 +2,12 @@
 
 #![deny(unused)]
 
-trait Trt {}
+pub trait Trt {}
 pub struct Str {}
 impl Trt for Str {}
 
 macro_rules! check_impl {
-    ($struct:ident,$trait:ident) => {
+    ($struct:ident, $trait:ident) => {
         const _ : () = {
             use std::marker::PhantomData;
             struct ImplementsTrait<T: $trait>(PhantomData<T>);

tests/ui/default-method-parsing.rs

@@ -1,4 +1,4 @@
-// run-pass
+// check-pass
 // pretty-expanded FIXME #23616
 
 trait Foo {

tests/ui/delegation/target-expr-pass.rs

@@ -14,14 +14,14 @@ reuse to_reuse::foo {{
     x + self
 }}
 
-trait Trait {
+trait Trait { //~ WARN trait `Trait` is never used
     fn bar(&self, x: i32) -> i32 { x }
 }
 
-struct F;
+struct F; //~ WARN struct `F` is never constructed
 impl Trait for F {}
 
-struct S(F);
+struct S(F); //~ WARN struct `S` is never constructed
 impl Trait for S {
     reuse <F as Trait>::bar {
         #[allow(unused_imports)]

tests/ui/delegation/target-expr-pass.stderr

@@ -7,5 +7,25 @@ LL | #![feature(fn_delegation)]
    = note: see issue #118212 <https://github.com/rust-lang/rust/issues/118212> for more information
    = note: `#[warn(incomplete_features)]` on by default
 
-warning: 1 warning emitted
+warning: trait `Trait` is never used
+  --> $DIR/target-expr-pass.rs:17:7
+   |
+LL | trait Trait {
+   |       ^^^^^
+   |
+   = note: `#[warn(dead_code)]` on by default
+
+warning: struct `F` is never constructed
+  --> $DIR/target-expr-pass.rs:21:8
+   |
+LL | struct F;
+   |        ^
+
+warning: struct `S` is never constructed
+  --> $DIR/target-expr-pass.rs:24:8
+   |
+LL | struct S(F);
+   |        ^
+
+warning: 4 warnings emitted
 

tests/ui/deriving/deriving-bounds.rs

@@ -1,4 +1,4 @@
-// run-pass
+// check-pass
 #[derive(Copy, Clone)]
 struct Test;
 

tests/ui/drop/drop-struct-as-object.rs

@@ -12,7 +12,7 @@ struct Cat {
 }
 
 trait Dummy {
-    fn get(&self) -> usize;
+    fn get(&self) -> usize; //~ WARN method `get` is never used
 }
 
 impl Dummy for Cat {

tests/ui/drop/drop-struct-as-object.stderr

@@ -0,0 +1,12 @@
+warning: method `get` is never used
+  --> $DIR/drop-struct-as-object.rs:15:8
+   |
+LL | trait Dummy {
+   |       ----- method in this trait
+LL |     fn get(&self) -> usize;
+   |        ^^^
+   |
+   = note: `#[warn(dead_code)]` on by default
+
+warning: 1 warning emitted
+

tests/ui/dynamically-sized-types/dst-coercions.rs

@@ -5,7 +5,7 @@
 // pretty-expanded FIXME #23616
 
 struct S;
-trait T { fn dummy(&self) { } }
+trait T { fn dummy(&self) { } } //~ WARN method `dummy` is never used
 impl T for S {}
 
 pub fn main() {

tests/ui/dynamically-sized-types/dst-coercions.stderr

@@ -0,0 +1,12 @@
+warning: method `dummy` is never used
+  --> $DIR/dst-coercions.rs:8:14
+   |
+LL | trait T { fn dummy(&self) { } }
+   |       -      ^^^^^
+   |       |
+   |       method in this trait
+   |
+   = note: `#[warn(dead_code)]` on by default
+
+warning: 1 warning emitted
+

tests/ui/empty-type-parameter-list.rs

@@ -3,7 +3,7 @@
 // no type parameters at all
 
 struct S<>;
-trait T<> {}
+trait T<> {} //~ WARN trait `T` is never used
 enum E<> { V }
 impl<> T<> for S<> {}
 impl T for E {}

tests/ui/empty-type-parameter-list.stderr

@@ -0,0 +1,10 @@
+warning: trait `T` is never used
+  --> $DIR/empty-type-parameter-list.rs:6:7
+   |
+LL | trait T<> {}
+   |       ^
+   |
+   = note: `#[warn(dead_code)]` on by default
+
+warning: 1 warning emitted
+

tests/ui/explicit/explicit-call-to-supertrait-dtor.fixed

@@ -1,5 +1,6 @@
 // run-rustfix
 
+#![allow(dead_code)]
 #![allow(dropping_references)]
 
 struct Foo {

tests/ui/explicit/explicit-call-to-supertrait-dtor.rs

@@ -1,5 +1,6 @@
 // run-rustfix
 
+#![allow(dead_code)]
 #![allow(dropping_references)]
 
 struct Foo {

tests/ui/explicit/explicit-call-to-supertrait-dtor.stderr

@@ -1,5 +1,5 @@
 error[E0040]: explicit use of destructor method
-  --> $DIR/explicit-call-to-supertrait-dtor.rs:22:14
+  --> $DIR/explicit-call-to-supertrait-dtor.rs:23:14
    |
 LL |         self.drop();
    |              ^^^^ explicit destructor calls not allowed

tests/ui/extern/no-mangle-associated-fn.rs

@@ -12,7 +12,7 @@ impl Foo {
     }
 }
 
-trait Bar {
+trait Bar { //~ WARN trait `Bar` is never used
     fn qux() -> u8;
 }
 

tests/ui/extern/no-mangle-associated-fn.stderr

@@ -0,0 +1,10 @@
+warning: trait `Bar` is never used
+  --> $DIR/no-mangle-associated-fn.rs:15:7
+   |
+LL | trait Bar {
+   |       ^^^
+   |
+   = note: `#[warn(dead_code)]` on by default
+
+warning: 1 warning emitted
+

tests/ui/generic-associated-types/issue-88360.fixed

@@ -1,4 +1,5 @@
 // run-rustfix
+#![allow(dead_code)]
 
 trait GatTrait {
     type Gat<'a> where Self: 'a;

tests/ui/generic-associated-types/issue-88360.rs

@@ -1,4 +1,5 @@
 // run-rustfix
+#![allow(dead_code)]
 
 trait GatTrait {
     type Gat<'a> where Self: 'a;

tests/ui/generic-associated-types/issue-88360.stderr

@@ -1,5 +1,5 @@
 error[E0308]: mismatched types
-  --> $DIR/issue-88360.rs:15:9
+  --> $DIR/issue-88360.rs:16:9
    |
 LL | trait SuperTrait<T>
    |                  - found this type parameter

tests/ui/generics/generic-no-mangle.fixed

@@ -1,5 +1,5 @@
 // run-rustfix
-
+#![allow(dead_code)]
 #![deny(no_mangle_generic_items)]
 
 

tests/ui/generics/generic-no-mangle.rs

@@ -1,5 +1,5 @@
 // run-rustfix
-
+#![allow(dead_code)]
 #![deny(no_mangle_generic_items)]
 
 #[no_mangle]

tests/ui/impl-trait/example-st.rs

@@ -3,7 +3,7 @@
 struct State;
 type Error = ();
 
-trait Bind<F> {
+trait Bind<F> { //~ WARN trait `Bind` is never used
     type Output;
     fn bind(self, f: F) -> Self::Output;
 }