Make sure feature gate errors are recoverable (take 2)

src/librustc/ty/mod.rs

@@ -2839,7 +2839,7 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
             self.impl_polarity(def_id1) == self.impl_polarity(def_id2)
                 && trait1_is_empty
                 && trait2_is_empty
-        } else if self.features().marker_trait_attr {
+        } else {
             let is_marker_impl = |def_id: DefId| -> bool {
                 let trait_ref = self.impl_trait_ref(def_id);
                 trait_ref.map_or(false, |tr| self.trait_def(tr.def_id).is_marker)
@@ -2847,8 +2847,6 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
             self.impl_polarity(def_id1) == self.impl_polarity(def_id2)
                 && is_marker_impl(def_id1)
                 && is_marker_impl(def_id2)
-        } else {
-            false
         };
 
         if is_legit {

src/librustc_driver/driver.rs

@@ -1098,23 +1098,20 @@ where
         ast_validation::check_crate(sess, &krate)
     });
 
-    time(sess, "name resolution", || -> CompileResult {
+    time(sess, "name resolution", || {
         resolver.resolve_crate(&krate);
-        Ok(())
-    })?;
+    });
 
     // Needs to go *after* expansion to be able to check the results of macro expansion.
     time(sess, "complete gated feature checking", || {
-        sess.track_errors(|| {
-            syntax::feature_gate::check_crate(
-                &krate,
-                &sess.parse_sess,
-                &sess.features_untracked(),
-                &attributes,
-                sess.opts.unstable_features,
-            );
-        })
-    })?;
+        syntax::feature_gate::check_crate(
+            &krate,
+            &sess.parse_sess,
+            &sess.features_untracked(),
+            &attributes,
+            sess.opts.unstable_features,
+        );
+    });
 
     // Lower ast -> hir.
     // First, we need to collect the dep_graph.

src/test/ui/conditional-compilation/cfg-attr-crate-2.rs

@@ -1,8 +1,8 @@
-//
-// compile-flags: --cfg broken
-
 // https://github.com/rust-lang/rust/issues/21833#issuecomment-72353044
 
+// compile-flags: --cfg broken
+
+#![crate_type = "lib"]
 #![cfg_attr(broken, no_core)] //~ ERROR no_core is experimental
 
-fn main() { }
+pub struct S {}

src/test/ui/conditional-compilation/cfg-attr-multi-invalid-1.rs

@@ -1,7 +1,7 @@
-//
 // compile-flags: --cfg broken
 
 #![feature(cfg_attr_multi)]
+#![crate_type = "lib"]
 #![cfg_attr(broken, no_core, no_std)] //~ ERROR no_core is experimental
 
-fn main() { }
+pub struct S {}

src/test/ui/conditional-compilation/cfg-attr-multi-invalid-2.rs

@@ -1,7 +1,7 @@
-//
 // compile-flags: --cfg broken
 
 #![feature(cfg_attr_multi)]
+#![crate_type = "lib"]
 #![cfg_attr(broken, no_std, no_core)] //~ ERROR no_core is experimental
 
-fn main() { }
+pub struct S {}

src/test/ui/feature-gates/feature-gate-alloc-error-handler.rs

@@ -9,3 +9,6 @@ use core::alloc::Layout;
 fn oom(info: Layout) -> ! {
     loop {}
 }
+
+#[panic_handler]
+fn panic(_: &core::panic::PanicInfo) -> ! { loop {} }

src/test/ui/feature-gates/feature-gate-allow_fail.rs

@@ -5,3 +5,4 @@ fn ok_to_fail() {
     assert!(false);
 }
 
+fn main() {}

src/test/ui/feature-gates/feature-gate-async-await-2015-edition.rs

@@ -6,5 +6,5 @@ async fn foo() {} //~ ERROR async fn is unstable
 
 fn main() {
     let _ = async {}; //~ ERROR cannot find struct, variant or union type `async`
-    let _ = async || {}; //~ ERROR cannot find value `async` in this scope
+    let _ = async || { true }; //~ ERROR cannot find value `async` in this scope
 }

src/test/ui/feature-gates/feature-gate-async-await-2015-edition.stderr

@@ -7,7 +7,7 @@ LL |     let _ = async {}; //~ ERROR cannot find struct, variant or union type `
 error[E0425]: cannot find value `async` in this scope
   --> $DIR/feature-gate-async-await-2015-edition.rs:9:13
    |
-LL |     let _ = async || {}; //~ ERROR cannot find value `async` in this scope
+LL |     let _ = async || { true }; //~ ERROR cannot find value `async` in this scope
    |             ^^^^^ not found in this scope
 
 error[E0658]: async fn is unstable (see issue #50547)

src/test/ui/feature-gates/feature-gate-const_fn.rs

@@ -9,14 +9,16 @@ trait Foo {
                                 //~| ERROR trait fns cannot be declared const
 }
 
-impl Foo {
-    const fn baz() -> u32 { 0 } // ok
-}
-
 impl Foo for u32 {
     const fn foo() -> u32 { 0 } //~ ERROR trait fns cannot be declared const
 }
 
+trait Bar {}
+
+impl dyn Bar {
+    const fn baz() -> u32 { 0 } // ok
+}
+
 static FOO: usize = foo();
 const BAR: usize = foo();
 

src/test/ui/feature-gates/feature-gate-const_fn.stderr

@@ -11,7 +11,7 @@ LL |     const fn bar() -> u32 { 0 } //~ ERROR const fn is unstable
    |     ^^^^^ trait fns cannot be const
 
 error[E0379]: trait fns cannot be declared const
-  --> $DIR/feature-gate-const_fn.rs:17:5
+  --> $DIR/feature-gate-const_fn.rs:13:5
    |
 LL |     const fn foo() -> u32 { 0 } //~ ERROR trait fns cannot be declared const
    |     ^^^^^ trait fns cannot be const

src/test/ui/feature-gates/feature-gate-doc_keyword.rs

@@ -1,3 +1,5 @@
 #[doc(keyword = "match")] //~ ERROR: #[doc(keyword = "...")] is experimental
 /// wonderful
 mod foo{}
+
+fn main() {}

src/test/ui/feature-gates/feature-gate-dropck-ugeh.rs

@@ -1,14 +1,11 @@
 // gate-test-dropck_parametricity
 
 // Ensure that attempts to use the unsafe attribute are feature-gated.
-
 // Example adapted from RFC 1238 text (just left out the feature gate).
 
 // https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
 //     #example-of-the-unguarded-escape-hatch
 
-// #![feature(dropck_parametricity)]
-
 use std::cell::Cell;
 
 struct Concrete<'a>(u32, Cell<Option<&'a Concrete<'a>>>);
@@ -18,6 +15,7 @@ struct Foo<T> { data: Vec<T> }
 impl<T> Drop for Foo<T> {
     #[unsafe_destructor_blind_to_params] // This is the UGEH attribute
     //~^ ERROR unsafe_destructor_blind_to_params has been replaced
+    //~| WARN use of deprecated attribute `dropck_parametricity`
     fn drop(&mut self) { }
 }
 
@@ -29,4 +27,3 @@ fn main() {
     foo.data[0].1.set(Some(&foo.data[1]));
     foo.data[1].1.set(Some(&foo.data[0]));
 }
-

src/test/ui/feature-gates/feature-gate-dropck-ugeh.stderr

@@ -1,11 +1,19 @@
 error[E0658]: unsafe_destructor_blind_to_params has been replaced by may_dangle and will be removed in the future (see issue #28498)
-  --> $DIR/feature-gate-dropck-ugeh.rs:19:5
+  --> $DIR/feature-gate-dropck-ugeh.rs:16:5
    |
 LL |     #[unsafe_destructor_blind_to_params] // This is the UGEH attribute
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add #![feature(dropck_parametricity)] to the crate attributes to enable
 
+warning: use of deprecated attribute `dropck_parametricity`: unsafe_destructor_blind_to_params has been replaced by may_dangle and will be removed in the future. See https://github.com/rust-lang/rust/issues/34761
+  --> $DIR/feature-gate-dropck-ugeh.rs:16:5
+   |
+LL |     #[unsafe_destructor_blind_to_params] // This is the UGEH attribute
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace this attribute with `#[may_dangle]`
+   |
+   = note: #[warn(deprecated)] on by default
+
 error: aborting due to previous error
 
 For more information about this error, try `rustc --explain E0658`.

src/test/ui/feature-gates/feature-gate-existential-type.rs

@@ -1,15 +1,17 @@
 // Check that existential types must be ungated to use the `existential` keyword
 
-
-
 existential type Foo: std::fmt::Debug; //~ ERROR existential types are unstable
 
 trait Bar {
     type Baa: std::fmt::Debug;
+    fn define() -> Self::Baa;
 }
 
 impl Bar for () {
     existential type Baa: std::fmt::Debug; //~ ERROR existential types are unstable
+    fn define() -> Self::Baa { 0 }
 }
 
+fn define() -> Foo { 0 }
+
 fn main() {}

src/test/ui/feature-gates/feature-gate-existential-type.stderr

@@ -1,5 +1,5 @@
 error[E0658]: existential types are unstable (see issue #34511)
-  --> $DIR/feature-gate-existential-type.rs:5:1
+  --> $DIR/feature-gate-existential-type.rs:3:1
    |
 LL | existential type Foo: std::fmt::Debug; //~ ERROR existential types are unstable
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -7,7 +7,7 @@ LL | existential type Foo: std::fmt::Debug; //~ ERROR existential types are unst
    = help: add #![feature(existential_type)] to the crate attributes to enable
 
 error[E0658]: existential types are unstable (see issue #34511)
-  --> $DIR/feature-gate-existential-type.rs:12:5
+  --> $DIR/feature-gate-existential-type.rs:11:5
    |
 LL |     existential type Baa: std::fmt::Debug; //~ ERROR existential types are unstable
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

src/test/ui/feature-gates/feature-gate-generators.rs

@@ -1,3 +1,4 @@
 fn main() {
     yield true; //~ ERROR yield syntax is experimental
+                //~^ ERROR yield statement outside of generator literal
 }

src/test/ui/feature-gates/feature-gate-generators.stderr

@@ -6,6 +6,13 @@ LL |     yield true; //~ ERROR yield syntax is experimental
    |
    = help: add #![feature(generators)] to the crate attributes to enable
 
-error: aborting due to previous error
+error[E0627]: yield statement outside of generator literal
+  --> $DIR/feature-gate-generators.rs:2:5
+   |
+LL |     yield true; //~ ERROR yield syntax is experimental
+   |     ^^^^^^^^^^
 
-For more information about this error, try `rustc --explain E0658`.
+error: aborting due to 2 previous errors
+
+Some errors occurred: E0627, E0658.
+For more information about an error, try `rustc --explain E0627`.

src/test/ui/feature-gates/feature-gate-generic_associated_types.rs

@@ -11,9 +11,9 @@ trait PointerFamily<U> {
 struct Foo;
 
 impl PointerFamily<u32> for Foo {
-    type Pointer<usize> = Box<usize>;
+    type Pointer<Usize> = Box<Usize>;
     //~^ ERROR generic associated types are unstable
-    type Pointer2<u32> = Box<u32>;
+    type Pointer2<U32> = Box<U32>;
     //~^ ERROR generic associated types are unstable
 }
 

src/test/ui/feature-gates/feature-gate-generic_associated_types.stderr

@@ -25,7 +25,7 @@ LL |     type Pointer2<T>: Deref<Target = T> where T: Clone, U: Clone;
 error[E0658]: generic associated types are unstable (see issue #44265)
   --> $DIR/feature-gate-generic_associated_types.rs:14:5
    |
-LL |     type Pointer<usize> = Box<usize>;
+LL |     type Pointer<Usize> = Box<Usize>;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add #![feature(generic_associated_types)] to the crate attributes to enable
@@ -33,7 +33,7 @@ LL |     type Pointer<usize> = Box<usize>;
 error[E0658]: generic associated types are unstable (see issue #44265)
   --> $DIR/feature-gate-generic_associated_types.rs:16:5
    |
-LL |     type Pointer2<u32> = Box<u32>;
+LL |     type Pointer2<U32> = Box<U32>;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add #![feature(generic_associated_types)] to the crate attributes to enable

src/test/ui/feature-gates/feature-gate-intrinsics.rs

@@ -1,9 +1,7 @@
 extern "rust-intrinsic" {   //~ ERROR intrinsics are subject to change
-    fn bar();
+    fn bar(); //~ ERROR unrecognized intrinsic function: `bar`
 }
 
-extern "rust-intrinsic" fn baz() {  //~ ERROR intrinsics are subject to change
-}
+extern "rust-intrinsic" fn baz() {} //~ ERROR intrinsics are subject to change
 
-fn main() {
-}
+fn main() {}

src/test/ui/feature-gates/feature-gate-intrinsics.stderr

@@ -2,7 +2,7 @@ error[E0658]: intrinsics are subject to change
   --> $DIR/feature-gate-intrinsics.rs:1:1
    |
 LL | / extern "rust-intrinsic" {   //~ ERROR intrinsics are subject to change
-LL | |     fn bar();
+LL | |     fn bar(); //~ ERROR unrecognized intrinsic function: `bar`
 LL | | }
    | |_^
    |
@@ -11,12 +11,18 @@ LL | | }
 error[E0658]: intrinsics are subject to change
   --> $DIR/feature-gate-intrinsics.rs:5:1
    |
-LL | / extern "rust-intrinsic" fn baz() {  //~ ERROR intrinsics are subject to change
-LL | | }
-   | |_^
+LL | extern "rust-intrinsic" fn baz() {} //~ ERROR intrinsics are subject to change
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add #![feature(intrinsics)] to the crate attributes to enable
 
-error: aborting due to 2 previous errors
+error[E0093]: unrecognized intrinsic function: `bar`
+  --> $DIR/feature-gate-intrinsics.rs:2:5
+   |
+LL |     fn bar(); //~ ERROR unrecognized intrinsic function: `bar`
+   |     ^^^^^^^^^ unrecognized intrinsic
 
-For more information about this error, try `rustc --explain E0658`.
+error: aborting due to 3 previous errors
+
+Some errors occurred: E0093, E0658.
+For more information about an error, try `rustc --explain E0093`.

src/test/ui/feature-gates/feature-gate-lang-items.rs

@@ -1,5 +1,5 @@
-#[lang="foo"]   //~ ERROR language items are subject to change
+#[lang = "foo"] //~ ERROR language items are subject to change
+                //~^ ERROR definition of an unknown language item: `foo`
 trait Foo {}
 
-fn main() {
-}
+fn main() {}

src/test/ui/feature-gates/feature-gate-lang-items.stderr

@@ -1,11 +1,18 @@
 error[E0658]: language items are subject to change
   --> $DIR/feature-gate-lang-items.rs:1:1
    |
-LL | #[lang="foo"]   //~ ERROR language items are subject to change
-   | ^^^^^^^^^^^^^
+LL | #[lang = "foo"] //~ ERROR language items are subject to change
+   | ^^^^^^^^^^^^^^^
    |
    = help: add #![feature(lang_items)] to the crate attributes to enable
 
-error: aborting due to previous error
+error[E0522]: definition of an unknown language item: `foo`
+  --> $DIR/feature-gate-lang-items.rs:1:1
+   |
+LL | #[lang = "foo"] //~ ERROR language items are subject to change
+   | ^^^^^^^^^^^^^^^ definition of unknown language item `foo`
 
-For more information about this error, try `rustc --explain E0658`.
+error: aborting due to 2 previous errors
+
+Some errors occurred: E0522, E0658.
+For more information about an error, try `rustc --explain E0522`.

src/test/ui/feature-gates/feature-gate-linkage.rs

@@ -2,3 +2,5 @@ extern {
     #[linkage = "extern_weak"] static foo: isize;
     //~^ ERROR: the `linkage` attribute is experimental and not portable
 }
+
+fn main() {}

src/test/ui/feature-gates/feature-gate-may-dangle.rs

@@ -3,7 +3,9 @@
 // Check that `may_dangle` is rejected if `dropck_eyepatch` feature gate is absent.
 
 struct Pt<A>(A);
-impl<#[may_dangle] A> Drop for Pt<A> {
+unsafe impl<#[may_dangle] A> Drop for Pt<A> {
     //~^ ERROR may_dangle has unstable semantics and may be removed in the future
     fn drop(&mut self) { }
 }
+
+fn main() {}

src/test/ui/feature-gates/feature-gate-may-dangle.stderr

@@ -1,8 +1,8 @@
 error[E0658]: may_dangle has unstable semantics and may be removed in the future (see issue #34761)
-  --> $DIR/feature-gate-may-dangle.rs:6:6
+  --> $DIR/feature-gate-may-dangle.rs:6:13
    |
-LL | impl<#[may_dangle] A> Drop for Pt<A> {
-   |      ^^^^^^^^^^^^^
+LL | unsafe impl<#[may_dangle] A> Drop for Pt<A> {
+   |             ^^^^^^^^^^^^^
    |
    = help: add #![feature(dropck_eyepatch)] to the crate attributes to enable
 

src/test/ui/feature-gates/feature-gate-min_const_fn.rs

@@ -9,14 +9,16 @@ trait Foo {
                                 //~| ERROR trait fns cannot be declared const
 }
 
-impl Foo {
-    const fn baz() -> u32 { 0 } // stabilized
-}
-
 impl Foo for u32 {
     const fn foo() -> u32 { 0 } //~ ERROR trait fns cannot be declared const
 }
 
+trait Bar {}
+
+impl dyn Bar {
+    const fn baz() -> u32 { 0 } // stabilized
+}
+
 static FOO: usize = foo();
 const BAR: usize = foo();
 

src/test/ui/feature-gates/feature-gate-min_const_fn.stderr

@@ -11,7 +11,7 @@ LL |     const fn bar() -> u32 { 0 } //~ ERROR const fn is unstable
    |     ^^^^^ trait fns cannot be const
 
 error[E0379]: trait fns cannot be declared const
-  --> $DIR/feature-gate-min_const_fn.rs:17:5
+  --> $DIR/feature-gate-min_const_fn.rs:13:5
    |
 LL |     const fn foo() -> u32 { 0 } //~ ERROR trait fns cannot be declared const
    |     ^^^^^ trait fns cannot be const

src/test/ui/feature-gates/feature-gate-naked_functions.rs

@@ -7,3 +7,5 @@ fn naked() {}
 fn naked_2() -> isize {
     0
 }
+
+fn main() {}

src/test/ui/feature-gates/feature-gate-never_type.rs

@@ -6,8 +6,8 @@ trait Foo {
 
 type Ma = (u32, !, i32); //~ ERROR type is experimental
 type Meeshka = Vec<!>; //~ ERROR type is experimental
-type Mow = &fn(!) -> !; //~ ERROR type is experimental
-type Skwoz = &mut !; //~ ERROR type is experimental
+type Mow = &'static fn(!) -> !; //~ ERROR type is experimental
+type Skwoz = &'static mut !; //~ ERROR type is experimental
 
 impl Foo for Meeshka {
     type Wub = !; //~ ERROR type is experimental

src/test/ui/feature-gates/feature-gate-never_type.stderr

@@ -15,18 +15,18 @@ LL | type Meeshka = Vec<!>; //~ ERROR type is experimental
    = help: add #![feature(never_type)] to the crate attributes to enable
 
 error[E0658]: The `!` type is experimental (see issue #35121)
-  --> $DIR/feature-gate-never_type.rs:9:16
+  --> $DIR/feature-gate-never_type.rs:9:24
    |
-LL | type Mow = &fn(!) -> !; //~ ERROR type is experimental
-   |                ^
+LL | type Mow = &'static fn(!) -> !; //~ ERROR type is experimental
+   |                        ^
    |
    = help: add #![feature(never_type)] to the crate attributes to enable
 
 error[E0658]: The `!` type is experimental (see issue #35121)
-  --> $DIR/feature-gate-never_type.rs:10:19
+  --> $DIR/feature-gate-never_type.rs:10:27
    |
-LL | type Skwoz = &mut !; //~ ERROR type is experimental
-   |                   ^
+LL | type Skwoz = &'static mut !; //~ ERROR type is experimental
+   |                           ^
    |
    = help: add #![feature(never_type)] to the crate attributes to enable
 

src/test/ui/feature-gates/feature-gate-no_core.rs

@@ -1,3 +1,5 @@
+#![crate_type = "rlib"]
+
 #![no_core] //~ ERROR no_core is experimental
 
-fn main() {}
+pub struct S {}

src/test/ui/feature-gates/feature-gate-no_core.stderr

@@ -1,5 +1,5 @@
 error[E0658]: no_core is experimental (see issue #29639)
-  --> $DIR/feature-gate-no_core.rs:1:1
+  --> $DIR/feature-gate-no_core.rs:3:1
    |
 LL | #![no_core] //~ ERROR no_core is experimental
    | ^^^^^^^^^^^

src/test/ui/feature-gates/feature-gate-optin-builtin-traits.rs

@@ -3,14 +3,10 @@
 
 struct DummyStruct;
 
-trait DummyTrait {
-    fn dummy(&self) {}
-}
-
 auto trait AutoDummyTrait {}
 //~^ ERROR auto traits are experimental and possibly buggy
 
-impl !DummyTrait for DummyStruct {}
+impl !AutoDummyTrait for DummyStruct {}
 //~^ ERROR negative trait bounds are not yet fully implemented; use marker types for now
 
 fn main() {}

src/test/ui/feature-gates/feature-gate-optin-builtin-traits.stderr

@@ -1,5 +1,5 @@
 error[E0658]: auto traits are experimental and possibly buggy (see issue #13231)
-  --> $DIR/feature-gate-optin-builtin-traits.rs:10:1
+  --> $DIR/feature-gate-optin-builtin-traits.rs:6:1
    |
 LL | auto trait AutoDummyTrait {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -7,10 +7,10 @@ LL | auto trait AutoDummyTrait {}
    = help: add #![feature(optin_builtin_traits)] to the crate attributes to enable
 
 error[E0658]: negative trait bounds are not yet fully implemented; use marker types for now (see issue #13231)
-  --> $DIR/feature-gate-optin-builtin-traits.rs:13:1
+  --> $DIR/feature-gate-optin-builtin-traits.rs:9:1
    |
-LL | impl !DummyTrait for DummyStruct {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL | impl !AutoDummyTrait for DummyStruct {}
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add #![feature(optin_builtin_traits)] to the crate attributes to enable
 

src/test/ui/feature-gates/feature-gate-repr-simd.rs

@@ -1,7 +1,7 @@
 #[repr(simd)] //~ error: SIMD types are experimental
 struct Foo(u64, u64);
 
-#[repr(C)]
+#[repr(C)] //~ warn: conflicting representation hints
 #[repr(simd)] //~ error: SIMD types are experimental
 struct Bar(u64, u64);
 

src/test/ui/feature-gates/feature-gate-repr-simd.stderr

@@ -14,6 +14,15 @@ LL | #[repr(simd)] //~ error: SIMD types are experimental
    |
    = help: add #![feature(repr_simd)] to the crate attributes to enable
 
+warning[E0566]: conflicting representation hints
+  --> $DIR/feature-gate-repr-simd.rs:4:8
+   |
+LL | #[repr(C)] //~ warn: conflicting representation hints
+   |        ^
+LL | #[repr(simd)] //~ error: SIMD types are experimental
+   |        ^^^^
+
 error: aborting due to 2 previous errors
 
-For more information about this error, try `rustc --explain E0658`.
+Some errors occurred: E0566, E0658.
+For more information about an error, try `rustc --explain E0566`.

src/test/ui/feature-gates/feature-gate-rustc-attrs-1.rs

@@ -5,4 +5,4 @@
 #[rustc_variance] //~ ERROR the `#[rustc_variance]` attribute is just used for rustc unit tests and will never be stable
 #[rustc_error] //~ ERROR the `#[rustc_error]` attribute is just used for rustc unit tests and will never be stable
 
-fn main() {}
+fn main() {} //~ ERROR []

src/test/ui/feature-gates/feature-gate-rustc-attrs-1.stderr

@@ -14,6 +14,13 @@ LL | #[rustc_error] //~ ERROR the `#[rustc_error]` attribute is just used for ru
    |
    = help: add #![feature(rustc_attrs)] to the crate attributes to enable
 
-error: aborting due to 2 previous errors
+error[E0208]: []
+  --> $DIR/feature-gate-rustc-attrs-1.rs:8:1
+   |
+LL | fn main() {} //~ ERROR []
+   | ^^^^^^^^^^^^
 
-For more information about this error, try `rustc --explain E0658`.
+error: aborting due to 3 previous errors
+
+Some errors occurred: E0208, E0658.
+For more information about an error, try `rustc --explain E0208`.

src/test/ui/feature-gates/feature-gate-start.rs

@@ -1,2 +1,3 @@
 #[start]
-fn foo() {} //~ ERROR: a #[start] function is an experimental feature
+fn foo(_: isize, _: *const *const u8) -> isize { 0 }
+//~^ ERROR a #[start] function is an experimental feature

src/test/ui/feature-gates/feature-gate-start.stderr

@@ -1,8 +1,8 @@
 error[E0658]: a #[start] function is an experimental feature whose signature may change over time (see issue #29633)
   --> $DIR/feature-gate-start.rs:2:1
    |
-LL | fn foo() {} //~ ERROR: a #[start] function is an experimental feature
-   | ^^^^^^^^^^^
+LL | fn foo(_: isize, _: *const *const u8) -> isize { 0 }
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add #![feature(start)] to the crate attributes to enable
 

src/test/ui/feature-gates/feature-gate-thread_local.rs

@@ -8,8 +8,4 @@
 #[thread_local] //~ ERROR `#[thread_local]` is an experimental feature
 static FOO: i32 = 3;
 
-pub fn main() {
-    FOO.with(|x| {
-        println!("x: {}", x);
-    });
-}
+pub fn main() {}

src/test/ui/feature-gates/feature-gate-unboxed-closures-manual-impls.rs

@@ -3,25 +3,29 @@
 // never triggers (yet), because they encounter other problems around
 // angle bracket vs parentheses notation.
 
-#![allow(dead_code)]
+#![feature(fn_traits)]
 
 struct Foo;
 impl Fn<()> for Foo {
+//~^ ERROR the precise format of `Fn`-family traits' type parameters is subject to change
     extern "rust-call" fn call(self, args: ()) -> () {}
     //~^ ERROR rust-call ABI is subject to change
 }
 struct Foo1;
 impl FnOnce() for Foo1 {
+//~^ ERROR associated type bindings are not allowed here
     extern "rust-call" fn call_once(self, args: ()) -> () {}
     //~^ ERROR rust-call ABI is subject to change
 }
 struct Bar;
 impl FnMut<()> for Bar {
+//~^ ERROR the precise format of `Fn`-family traits' type parameters is subject to change
     extern "rust-call" fn call_mut(&self, args: ()) -> () {}
     //~^ ERROR rust-call ABI is subject to change
 }
 struct Baz;
 impl FnOnce<()> for Baz {
+//~^ ERROR the precise format of `Fn`-family traits' type parameters is subject to change
     extern "rust-call" fn call_once(&self, args: ()) -> () {}
     //~^ ERROR rust-call ABI is subject to change
 }

src/test/ui/feature-gates/feature-gate-unboxed-closures-manual-impls.stderr

@@ -1,5 +1,5 @@
 error[E0658]: rust-call ABI is subject to change (see issue #29625)
-  --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:10:5
+  --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:11:5
    |
 LL |     extern "rust-call" fn call(self, args: ()) -> () {}
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -7,7 +7,7 @@ LL |     extern "rust-call" fn call(self, args: ()) -> () {}
    = help: add #![feature(unboxed_closures)] to the crate attributes to enable
 
 error[E0658]: rust-call ABI is subject to change (see issue #29625)
-  --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:15:5
+  --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:17:5
    |
 LL |     extern "rust-call" fn call_once(self, args: ()) -> () {}
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -15,7 +15,7 @@ LL |     extern "rust-call" fn call_once(self, args: ()) -> () {}
    = help: add #![feature(unboxed_closures)] to the crate attributes to enable
 
 error[E0658]: rust-call ABI is subject to change (see issue #29625)
-  --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:20:5
+  --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:23:5
    |
 LL |     extern "rust-call" fn call_mut(&self, args: ()) -> () {}
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -23,13 +23,44 @@ LL |     extern "rust-call" fn call_mut(&self, args: ()) -> () {}
    = help: add #![feature(unboxed_closures)] to the crate attributes to enable
 
 error[E0658]: rust-call ABI is subject to change (see issue #29625)
-  --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:25:5
+  --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:29:5
    |
 LL |     extern "rust-call" fn call_once(&self, args: ()) -> () {}
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: add #![feature(unboxed_closures)] to the crate attributes to enable
 
-error: aborting due to 4 previous errors
+error[E0658]: the precise format of `Fn`-family traits' type parameters is subject to change. Use parenthetical notation (Fn(Foo, Bar) -> Baz) instead (see issue #29625)
+  --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:9:6
+   |
+LL | impl Fn<()> for Foo {
+   |      ^^^^^^
+   |
+   = help: add #![feature(unboxed_closures)] to the crate attributes to enable
 
-For more information about this error, try `rustc --explain E0658`.
+error[E0229]: associated type bindings are not allowed here
+  --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:15:12
+   |
+LL | impl FnOnce() for Foo1 {
+   |            ^^ associated type not allowed here
+
+error[E0658]: the precise format of `Fn`-family traits' type parameters is subject to change. Use parenthetical notation (Fn(Foo, Bar) -> Baz) instead (see issue #29625)
+  --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:21:6
+   |
+LL | impl FnMut<()> for Bar {
+   |      ^^^^^^^^^
+   |
+   = help: add #![feature(unboxed_closures)] to the crate attributes to enable
+
+error[E0658]: the precise format of `Fn`-family traits' type parameters is subject to change. Use parenthetical notation (Fn(Foo, Bar) -> Baz) instead (see issue #29625)
+  --> $DIR/feature-gate-unboxed-closures-manual-impls.rs:27:6
+   |
+LL | impl FnOnce<()> for Baz {
+   |      ^^^^^^^^^^
+   |
+   = help: add #![feature(unboxed_closures)] to the crate attributes to enable
+
+error: aborting due to 8 previous errors
+
+Some errors occurred: E0229, E0658.
+For more information about an error, try `rustc --explain E0229`.

src/test/ui/feature-gates/feature-gate-unboxed-closures.rs

@@ -1,6 +1,9 @@
+#![feature(fn_traits)]
+
 struct Test;
 
 impl FnOnce<(u32, u32)> for Test {
+//~^ ERROR the precise format of `Fn`-family traits' type parameters is subject to change
     type Output = u32;
 
     extern "rust-call" fn call_once(self, (a, b): (u32, u32)) -> u32 {

src/test/ui/feature-gates/feature-gate-unboxed-closures.stderr

@@ -1,5 +1,5 @@
 error[E0658]: rust-call ABI is subject to change (see issue #29625)
-  --> $DIR/feature-gate-unboxed-closures.rs:6:5
+  --> $DIR/feature-gate-unboxed-closures.rs:9:5
    |
 LL | /     extern "rust-call" fn call_once(self, (a, b): (u32, u32)) -> u32 {
 LL | |         a + b
@@ -8,6 +8,14 @@ LL | |     }
    |
    = help: add #![feature(unboxed_closures)] to the crate attributes to enable
 
-error: aborting due to previous error
+error[E0658]: the precise format of `Fn`-family traits' type parameters is subject to change. Use parenthetical notation (Fn(Foo, Bar) -> Baz) instead (see issue #29625)
+  --> $DIR/feature-gate-unboxed-closures.rs:5:6
+   |
+LL | impl FnOnce<(u32, u32)> for Test {
+   |      ^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(unboxed_closures)] to the crate attributes to enable
+
+error: aborting due to 2 previous errors
 
 For more information about this error, try `rustc --explain E0658`.

src/test/ui/issues/issue-51279.rs

@@ -15,7 +15,7 @@ pub struct Y<#[cfg(none)] T>(T); // shouldn't care when the entire item is strip
 
 struct M<T>(*const T);
 
-unsafe impl<#[cfg_attr(none, may_dangle)] T> Drop for M<T> {
+impl<#[cfg_attr(none, may_dangle)] T> Drop for M<T> {
     //~^ ERROR #[cfg_attr] cannot be applied on a generic parameter
     fn drop(&mut self) {}
 }
@@ -23,3 +23,5 @@ unsafe impl<#[cfg_attr(none, may_dangle)] T> Drop for M<T> {
 type Z<#[ignored] 'a, #[cfg(none)] T> = X<'a, T>;
 //~^ ERROR #[cfg] cannot be applied on a generic parameter
 //~| ERROR attribute `ignored` is currently unknown to the compiler
+
+fn main() {}

src/test/ui/issues/issue-51279.stderr

@@ -35,10 +35,10 @@ LL | pub fn f<#[cfg(none)] 'a, #[cfg(none)] T>(_: &'a T) {}
    |                           ^^^^^^^^^^^^
 
 error: #[cfg_attr] cannot be applied on a generic parameter
-  --> $DIR/issue-51279.rs:18:13
+  --> $DIR/issue-51279.rs:18:6
    |
-LL | unsafe impl<#[cfg_attr(none, may_dangle)] T> Drop for M<T> {
-   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL | impl<#[cfg_attr(none, may_dangle)] T> Drop for M<T> {
+   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: #[cfg] cannot be applied on a generic parameter
   --> $DIR/issue-51279.rs:23:23

src/test/ui/on-unimplemented/expected-comma-found-token.rs

@@ -4,11 +4,10 @@
 
 #![feature(on_unimplemented)]
 
-#[rustc_on_unimplemented(
+#[rustc_on_unimplemented( //~ ERROR `#[rustc_on_unimplemented]` requires a value
     message="the message"
-    label="the label"
+    label="the label" //~ ERROR expected one of `)` or `,`, found `label`
 )]
 trait T {}
-//~^^^ ERROR expected one of `)` or `,`, found `label`
 
 fn main() {  }

src/test/ui/on-unimplemented/expected-comma-found-token.stderr

@@ -3,8 +3,20 @@ error: expected one of `)` or `,`, found `label`
    |
 LL |     message="the message"
    |                          - expected one of `)` or `,` here
-LL |     label="the label"
+LL |     label="the label" //~ ERROR expected one of `)` or `,`, found `label`
    |     ^^^^^ unexpected token
 
-error: aborting due to previous error
+error[E0232]: `#[rustc_on_unimplemented]` requires a value
+  --> $DIR/expected-comma-found-token.rs:7:1
+   |
+LL | / #[rustc_on_unimplemented( //~ ERROR `#[rustc_on_unimplemented]` requires a value
+LL | |     message="the message"
+LL | |     label="the label" //~ ERROR expected one of `)` or `,`, found `label`
+LL | | )]
+   | |__^ value required here
+   |
+   = note: eg `#[rustc_on_unimplemented(message="foo")]`
 
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0232`.

src/test/ui/span/gated-features-attr-spans.rs

@@ -1,7 +1,7 @@
 #[repr(simd)] //~ ERROR are experimental
-struct Weapon {
-    name: String,
-    damage: u32
+struct Coord {
+    x: u32,
+    y: u32,
 }
 
 fn main() {}

src/test/ui/utf8_idents.rs

@@ -3,6 +3,7 @@
 fn foo<
     'β, //~ ERROR non-ascii idents are not fully supported
     γ  //~ ERROR non-ascii idents are not fully supported
+       //~^ WARN type parameter `γ` should have a camel case name such as `Γ`
 >() {}
 
 struct X {

src/test/ui/utf8_idents.stderr

@@ -15,7 +15,7 @@ LL |     γ  //~ ERROR non-ascii idents are not fully supported
    = help: add #![feature(non_ascii_idents)] to the crate attributes to enable
 
 error[E0658]: non-ascii idents are not fully supported. (see issue #55467)
-  --> $DIR/utf8_idents.rs:9:5
+  --> $DIR/utf8_idents.rs:10:5
    |
 LL |     δ: usize //~ ERROR non-ascii idents are not fully supported
    |     ^
@@ -23,13 +23,21 @@ LL |     δ: usize //~ ERROR non-ascii idents are not fully supported
    = help: add #![feature(non_ascii_idents)] to the crate attributes to enable
 
 error[E0658]: non-ascii idents are not fully supported. (see issue #55467)
-  --> $DIR/utf8_idents.rs:13:9
+  --> $DIR/utf8_idents.rs:14:9
    |
 LL |     let α = 0.00001f64; //~ ERROR non-ascii idents are not fully supported
    |         ^
    |
    = help: add #![feature(non_ascii_idents)] to the crate attributes to enable
 
+warning: type parameter `γ` should have a camel case name such as `Γ`
+  --> $DIR/utf8_idents.rs:5:5
+   |
+LL |     γ  //~ ERROR non-ascii idents are not fully supported
+   |     ^
+   |
+   = note: #[warn(non_camel_case_types)] on by default
+
 error: aborting due to 4 previous errors
 
 For more information about this error, try `rustc --explain E0658`.