Migrate a few feature gate tests to ui

Renames only in this commit, and obviously
.stderr file additions.

Author: est31

src/test/compile-fail/auxiliary/cfg-target-thread-local.rs renamed to src/test/ui/auxiliary/cfg-target-thread-local.rs

@@ -0,0 +1,10 @@
+error: msp430-interrupt ABI is experimental and subject to change (see issue #38487)
+  --> $DIR/feature-gate-abi-msp430-interrupt.rs:14:1
+   |
+14 | extern "msp430-interrupt" fn foo() {}
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_msp430_interrupt)] to the crate attributes to enable
+
+error: aborting due to previous error
+

src/test/compile-fail/feature-gate-abi-msp430-interrupt.rs renamed to src/test/ui/feature-gate-abi-msp430-interrupt.rs

@@ -0,0 +1,18 @@
+error: multiple-element slice matches anywhere but at the end of a slice (e.g. `[0, ..xs, 0]`) are experimental (see issue #23121)
+  --> $DIR/feature-gate-advanced-slice-features.rs:18:9
+   |
+18 |         [ xs.., 4, 5 ] => {}    //~ ERROR multiple-element slice matches
+   |         ^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(advanced_slice_patterns)] to the crate attributes to enable
+
+error: multiple-element slice matches anywhere but at the end of a slice (e.g. `[0, ..xs, 0]`) are experimental (see issue #23121)
+  --> $DIR/feature-gate-advanced-slice-features.rs:19:9
+   |
+19 |         [ 1, xs.., 5 ] => {}    //~ ERROR multiple-element slice matches
+   |         ^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(advanced_slice_patterns)] to the crate attributes to enable
+
+error: aborting due to 2 previous errors
+

src/test/ui/feature-gate-abi-msp430-interrupt.stderr

@@ -0,0 +1,10 @@
+error: the `#[default_lib_allocator]` attribute is an experimental feature
+  --> $DIR/feature-gate-allocator_internals.rs:11:1
+   |
+11 | #![default_lib_allocator] //~ ERROR: attribute is an experimental feature
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(allocator_internals)] to the crate attributes to enable
+
+error: aborting due to previous error
+

src/test/compile-fail/feature-gate-abi.rs renamed to src/test/ui/feature-gate-abi.rs

@@ -0,0 +1,13 @@
+error: allow_internal_unsafe side-steps the unsafe_code lint
+  --> $DIR/feature-gate-allow-internal-unsafe-nested-macro.rs:18:9
+   |
+18 |         #[allow_internal_unsafe] //~ ERROR allow_internal_unsafe side-steps
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^
+...
+25 | bar!();
+   | ------- in this macro invocation
+   |
+   = help: add #![feature(allow_internal_unsafe)] to the crate attributes to enable
+
+error: aborting due to previous error
+

src/test/ui/feature-gate-abi.stderr

@@ -0,0 +1,13 @@
+error: allow_internal_unstable side-steps feature gating and stability checks
+  --> $DIR/feature-gate-allow-internal-unstable-nested-macro.rs:18:9
+   |
+18 |         #[allow_internal_unstable] //~ ERROR allow_internal_unstable side-steps
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
+...
+25 | bar!();
+   | ------- in this macro invocation
+   |
+   = help: add #![feature(allow_internal_unstable)] to the crate attributes to enable
+
+error: aborting due to previous error
+

src/test/compile-fail/feature-gate-advanced-slice-features.rs renamed to src/test/ui/feature-gate-advanced-slice-features.rs

@@ -0,0 +1,10 @@
+error: allow_internal_unstable side-steps feature gating and stability checks
+  --> $DIR/feature-gate-allow-internal-unstable-struct.rs:14:1
+   |
+14 | #[allow_internal_unstable] //~ ERROR allow_internal_unstable side-steps
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(allow_internal_unstable)] to the crate attributes to enable
+
+error: aborting due to previous error
+

src/test/ui/feature-gate-advanced-slice-features.stderr

@@ -0,0 +1,10 @@
+error: allow_internal_unstable side-steps feature gating and stability checks
+  --> $DIR/feature-gate-allow-internal-unstable.rs:13:1
+   |
+13 | #[allow_internal_unstable] //~ ERROR allow_internal_unstable side-steps
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(allow_internal_unstable)] to the crate attributes to enable
+
+error: aborting due to previous error
+

src/test/compile-fail/feature-gate-allocator_internals.rs renamed to src/test/ui/feature-gate-allocator_internals.rs

@@ -0,0 +1,10 @@
+error: allow_fail attribute is currently unstable (see issue #42219)
+  --> $DIR/feature-gate-allow_fail.rs:13:1
+   |
+13 | #[allow_fail] //~ ERROR allow_fail attribute is currently unstable
+   | ^^^^^^^^^^^^^
+   |
+   = help: add #![feature(allow_fail)] to the crate attributes to enable
+
+error: aborting due to previous error
+

src/test/ui/feature-gate-allocator_internals.stderr

@@ -0,0 +1,29 @@
+error: arbitrary `self` types are unstable (see issue #44874)
+  --> $DIR/feature-gate-arbitrary-self-types.rs:14:18
+   |
+14 |     fn foo(self: Rc<Box<Self>>); //~ ERROR arbitrary `self` types are unstable
+   |                  ^^^^^^^^^^^^^
+   |
+   = help: add #![feature(arbitrary_self_types)] to the crate attributes to enable
+   = help: consider changing to `self`, `&self`, `&mut self`, or `self: Box<Self>`
+
+error: arbitrary `self` types are unstable (see issue #44874)
+  --> $DIR/feature-gate-arbitrary-self-types.rs:20:18
+   |
+20 |     fn foo(self: Rc<Box<Self>>) {} //~ ERROR arbitrary `self` types are unstable
+   |                  ^^^^^^^^^^^^^
+   |
+   = help: add #![feature(arbitrary_self_types)] to the crate attributes to enable
+   = help: consider changing to `self`, `&self`, `&mut self`, or `self: Box<Self>`
+
+error: arbitrary `self` types are unstable (see issue #44874)
+  --> $DIR/feature-gate-arbitrary-self-types.rs:24:18
+   |
+24 |     fn bar(self: Box<Rc<Self>>) {} //~ ERROR arbitrary `self` types are unstable
+   |                  ^^^^^^^^^^^^^
+   |
+   = help: add #![feature(arbitrary_self_types)] to the crate attributes to enable
+   = help: consider changing to `self`, `&self`, `&mut self`, or `self: Box<Self>`
+
+error: aborting due to 3 previous errors
+

src/test/compile-fail/feature-gate-allow-internal-unsafe-nested-macro.rs renamed to src/test/ui/feature-gate-allow-internal-unsafe-nested-macro.rs

@@ -0,0 +1,10 @@
+error: associated type defaults are unstable (see issue #29661)
+  --> $DIR/feature-gate-assoc-type-defaults.rs:14:5
+   |
+14 |     type Bar = u8; //~ ERROR associated type defaults are unstable
+   |     ^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(associated_type_defaults)] to the crate attributes to enable
+
+error: aborting due to previous error
+

src/test/ui/feature-gate-allow-internal-unsafe-nested-macro.stderr

@@ -0,0 +1,10 @@
+error: box expression syntax is experimental; you can call `Box::new` instead. (see issue #27779)
+  --> $DIR/feature-gate-box-expr.rs:22:13
+   |
+22 |     let x = box 'c'; //~ ERROR box expression syntax is experimental
+   |             ^^^^^^^
+   |
+   = help: add #![feature(box_syntax)] to the crate attributes to enable
+
+error: aborting due to previous error
+

src/test/compile-fail/feature-gate-allow-internal-unstable-nested-macro.rs renamed to src/test/ui/feature-gate-allow-internal-unstable-nested-macro.rs

@@ -0,0 +1,10 @@
+error: box pattern syntax is experimental (see issue #29641)
+  --> $DIR/feature-gate-box-pat.rs:14:9
+   |
+14 |     let box x = Box::new('c'); //~ ERROR box pattern syntax is experimental
+   |         ^^^^^
+   |
+   = help: add #![feature(box_patterns)] to the crate attributes to enable
+
+error: aborting due to previous error
+

src/test/ui/feature-gate-allow-internal-unstable-nested-macro.stderr

@@ -0,0 +1,14 @@
+error: `catch` expression is experimental (see issue #31436)
+  --> $DIR/feature-gate-catch_expr.rs:12:24
+   |
+12 |       let catch_result = do catch { //~ ERROR `catch` expression is experimental
+   |  ________________________^
+13 | |         let x = 5;
+14 | |         x
+15 | |     };
+   | |_____^
+   |
+   = help: add #![feature(catch_expr)] to the crate attributes to enable
+
+error: aborting due to previous error
+

src/test/compile-fail/feature-gate-allow-internal-unstable-struct.rs renamed to src/test/ui/feature-gate-allow-internal-unstable-struct.rs

@@ -0,0 +1,34 @@
+error: `cfg(target_feature)` is experimental and subject to change (see issue #29717)
+  --> $DIR/feature-gate-cfg-target-feature.rs:12:12
+   |
+12 | #[cfg_attr(target_feature = "x", x)] //~ ERROR `cfg(target_feature)` is experimental
+   |            ^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(cfg_target_feature)] to the crate attributes to enable
+
+error: `cfg(target_feature)` is experimental and subject to change (see issue #29717)
+  --> $DIR/feature-gate-cfg-target-feature.rs:11:7
+   |
+11 | #[cfg(target_feature = "x")] //~ ERROR `cfg(target_feature)` is experimental
+   |       ^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(cfg_target_feature)] to the crate attributes to enable
+
+error: `cfg(target_feature)` is experimental and subject to change (see issue #29717)
+  --> $DIR/feature-gate-cfg-target-feature.rs:15:19
+   |
+15 | #[cfg(not(any(all(target_feature = "x"))))] //~ ERROR `cfg(target_feature)` is experimental
+   |                   ^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(cfg_target_feature)] to the crate attributes to enable
+
+error: `cfg(target_feature)` is experimental and subject to change (see issue #29717)
+  --> $DIR/feature-gate-cfg-target-feature.rs:19:10
+   |
+19 |     cfg!(target_feature = "x");
+   |          ^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(cfg_target_feature)] to the crate attributes to enable
+
+error: aborting due to 4 previous errors
+

src/test/ui/feature-gate-allow-internal-unstable-struct.stderr

@@ -0,0 +1,122 @@
+error: `cfg(target_has_atomic)` is experimental and subject to change (see issue #32976)
+  --> $DIR/feature-gate-cfg-target-has-atomic.rs:23:7
+   |
+23 | #[cfg(target_has_atomic = "8")]
+   |       ^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(cfg_target_has_atomic)] to the crate attributes to enable
+
+error: `cfg(target_has_atomic)` is experimental and subject to change (see issue #32976)
+  --> $DIR/feature-gate-cfg-target-has-atomic.rs:29:7
+   |
+29 | #[cfg(target_has_atomic = "8")]
+   |       ^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(cfg_target_has_atomic)] to the crate attributes to enable
+
+error: `cfg(target_has_atomic)` is experimental and subject to change (see issue #32976)
+  --> $DIR/feature-gate-cfg-target-has-atomic.rs:34:7
+   |
+34 | #[cfg(target_has_atomic = "16")]
+   |       ^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(cfg_target_has_atomic)] to the crate attributes to enable
+
+error: `cfg(target_has_atomic)` is experimental and subject to change (see issue #32976)
+  --> $DIR/feature-gate-cfg-target-has-atomic.rs:39:7
+   |
+39 | #[cfg(target_has_atomic = "16")]
+   |       ^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(cfg_target_has_atomic)] to the crate attributes to enable
+
+error: `cfg(target_has_atomic)` is experimental and subject to change (see issue #32976)
+  --> $DIR/feature-gate-cfg-target-has-atomic.rs:44:7
+   |
+44 | #[cfg(target_has_atomic = "32")]
+   |       ^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(cfg_target_has_atomic)] to the crate attributes to enable
+
+error: `cfg(target_has_atomic)` is experimental and subject to change (see issue #32976)
+  --> $DIR/feature-gate-cfg-target-has-atomic.rs:49:7
+   |
+49 | #[cfg(target_has_atomic = "32")]
+   |       ^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(cfg_target_has_atomic)] to the crate attributes to enable
+
+error: `cfg(target_has_atomic)` is experimental and subject to change (see issue #32976)
+  --> $DIR/feature-gate-cfg-target-has-atomic.rs:54:7
+   |
+54 | #[cfg(target_has_atomic = "64")]
+   |       ^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(cfg_target_has_atomic)] to the crate attributes to enable
+
+error: `cfg(target_has_atomic)` is experimental and subject to change (see issue #32976)
+  --> $DIR/feature-gate-cfg-target-has-atomic.rs:59:7
+   |
+59 | #[cfg(target_has_atomic = "64")]
+   |       ^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(cfg_target_has_atomic)] to the crate attributes to enable
+
+error: `cfg(target_has_atomic)` is experimental and subject to change (see issue #32976)
+  --> $DIR/feature-gate-cfg-target-has-atomic.rs:64:7
+   |
+64 | #[cfg(target_has_atomic = "ptr")]
+   |       ^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(cfg_target_has_atomic)] to the crate attributes to enable
+
+error: `cfg(target_has_atomic)` is experimental and subject to change (see issue #32976)
+  --> $DIR/feature-gate-cfg-target-has-atomic.rs:69:7
+   |
+69 | #[cfg(target_has_atomic = "ptr")]
+   |       ^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(cfg_target_has_atomic)] to the crate attributes to enable
+
+error: `cfg(target_has_atomic)` is experimental and subject to change (see issue #32976)
+  --> $DIR/feature-gate-cfg-target-has-atomic.rs:76:10
+   |
+76 |     cfg!(target_has_atomic = "8");
+   |          ^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(cfg_target_has_atomic)] to the crate attributes to enable
+
+error: `cfg(target_has_atomic)` is experimental and subject to change (see issue #32976)
+  --> $DIR/feature-gate-cfg-target-has-atomic.rs:78:10
+   |
+78 |     cfg!(target_has_atomic = "16");
+   |          ^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(cfg_target_has_atomic)] to the crate attributes to enable
+
+error: `cfg(target_has_atomic)` is experimental and subject to change (see issue #32976)
+  --> $DIR/feature-gate-cfg-target-has-atomic.rs:80:10
+   |
+80 |     cfg!(target_has_atomic = "32");
+   |          ^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(cfg_target_has_atomic)] to the crate attributes to enable
+
+error: `cfg(target_has_atomic)` is experimental and subject to change (see issue #32976)
+  --> $DIR/feature-gate-cfg-target-has-atomic.rs:82:10
+   |
+82 |     cfg!(target_has_atomic = "64");
+   |          ^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(cfg_target_has_atomic)] to the crate attributes to enable
+
+error: `cfg(target_has_atomic)` is experimental and subject to change (see issue #32976)
+  --> $DIR/feature-gate-cfg-target-has-atomic.rs:84:10
+   |
+84 |     cfg!(target_has_atomic = "ptr");
+   |          ^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(cfg_target_has_atomic)] to the crate attributes to enable
+
+error: aborting due to 15 previous errors
+

src/test/compile-fail/feature-gate-allow-internal-unstable.rs renamed to src/test/ui/feature-gate-allow-internal-unstable.rs

@@ -0,0 +1,10 @@
+error: `cfg(target_thread_local)` is experimental and subject to change (see issue #29594)
+  --> $DIR/feature-gate-cfg-target-thread-local.rs:19:16
+   |
+19 |     #[cfg_attr(target_thread_local, thread_local)]
+   |                ^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(cfg_target_thread_local)] to the crate attributes to enable
+
+error: aborting due to previous error
+

src/test/ui/feature-gate-allow-internal-unstable.stderr

@@ -0,0 +1,34 @@
+error: `cfg(target_vendor)` is experimental and subject to change (see issue #29718)
+  --> $DIR/feature-gate-cfg-target-vendor.rs:12:12
+   |
+12 | #[cfg_attr(target_vendor = "x", x)] //~ ERROR `cfg(target_vendor)` is experimental
+   |            ^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(cfg_target_vendor)] to the crate attributes to enable
+
+error: `cfg(target_vendor)` is experimental and subject to change (see issue #29718)
+  --> $DIR/feature-gate-cfg-target-vendor.rs:11:7
+   |
+11 | #[cfg(target_vendor = "x")] //~ ERROR `cfg(target_vendor)` is experimental
+   |       ^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(cfg_target_vendor)] to the crate attributes to enable
+
+error: `cfg(target_vendor)` is experimental and subject to change (see issue #29718)
+  --> $DIR/feature-gate-cfg-target-vendor.rs:15:19
+   |
+15 | #[cfg(not(any(all(target_vendor = "x"))))] //~ ERROR `cfg(target_vendor)` is experimental
+   |                   ^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(cfg_target_vendor)] to the crate attributes to enable
+
+error: `cfg(target_vendor)` is experimental and subject to change (see issue #29718)
+  --> $DIR/feature-gate-cfg-target-vendor.rs:19:10
+   |
+19 |     cfg!(target_vendor = "x");
+   |          ^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(cfg_target_vendor)] to the crate attributes to enable
+
+error: aborting due to 4 previous errors
+

src/test/compile-fail/feature-gate-allow_fail.rs renamed to src/test/ui/feature-gate-allow_fail.rs

@@ -0,0 +1,10 @@
+error[E0599]: no method named `clone` found for type `[closure@$DIR/feature-gate-clone-closures.rs:16:17: 18:6 a:_]` in the current scope
+  --> $DIR/feature-gate-clone-closures.rs:20:23
+   |
+20 |     let hello = hello.clone(); //~ ERROR no method named `clone` found for type
+   |                       ^^^^^
+   |
+   = note: hello is a function, perhaps you wish to call it
+
+error: aborting due to previous error
+