Migrate a few feature gate tests to ui

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

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

@@ -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/ui/feature-gate-abi.stderr

@@ -0,0 +1,450 @@
+error: intrinsics are subject to change
+  --> $DIR/feature-gate-abi.rs:19:1
+   |
+19 | extern "rust-intrinsic" fn f1() {} //~ ERROR intrinsics are subject to change
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(intrinsics)] to the crate attributes to enable
+
+error: platform intrinsics are experimental and possibly buggy (see issue #27731)
+  --> $DIR/feature-gate-abi.rs:20:1
+   |
+20 | extern "platform-intrinsic" fn f2() {} //~ ERROR platform intrinsics are experimental
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(platform_intrinsics)] to the crate attributes to enable
+
+error: vectorcall is experimental and subject to change
+  --> $DIR/feature-gate-abi.rs:21:1
+   |
+21 | extern "vectorcall" fn f3() {} //~ ERROR vectorcall is experimental and subject to change
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_vectorcall)] to the crate attributes to enable
+
+error: rust-call ABI is subject to change (see issue #29625)
+  --> $DIR/feature-gate-abi.rs:22:1
+   |
+22 | extern "rust-call" fn f4() {} //~ ERROR rust-call ABI is subject to change
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(unboxed_closures)] to the crate attributes to enable
+
+error: msp430-interrupt ABI is experimental and subject to change (see issue #38487)
+  --> $DIR/feature-gate-abi.rs:23:1
+   |
+23 | extern "msp430-interrupt" fn f5() {} //~ ERROR msp430-interrupt ABI is experimental
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_msp430_interrupt)] to the crate attributes to enable
+
+error: PTX ABIs are experimental and subject to change
+  --> $DIR/feature-gate-abi.rs:24:1
+   |
+24 | extern "ptx-kernel" fn f6() {} //~ ERROR PTX ABIs are experimental and subject to change
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_ptx)] to the crate attributes to enable
+
+error: x86-interrupt ABI is experimental and subject to change (see issue #40180)
+  --> $DIR/feature-gate-abi.rs:25:1
+   |
+25 | extern "x86-interrupt" fn f7() {} //~ ERROR x86-interrupt ABI is experimental
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_x86_interrupt)] to the crate attributes to enable
+
+error: thiscall is experimental and subject to change
+  --> $DIR/feature-gate-abi.rs:26:1
+   |
+26 | extern "thiscall" fn f8() {} //~ ERROR thiscall is experimental and subject to change
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_thiscall)] to the crate attributes to enable
+
+error: intrinsics are subject to change
+  --> $DIR/feature-gate-abi.rs:30:5
+   |
+30 |     extern "rust-intrinsic" fn m1(); //~ ERROR intrinsics are subject to change
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(intrinsics)] to the crate attributes to enable
+
+error: platform intrinsics are experimental and possibly buggy (see issue #27731)
+  --> $DIR/feature-gate-abi.rs:31:5
+   |
+31 |     extern "platform-intrinsic" fn m2(); //~ ERROR platform intrinsics are experimental
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(platform_intrinsics)] to the crate attributes to enable
+
+error: vectorcall is experimental and subject to change
+  --> $DIR/feature-gate-abi.rs:32:5
+   |
+32 |     extern "vectorcall" fn m3(); //~ ERROR vectorcall is experimental and subject to change
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_vectorcall)] to the crate attributes to enable
+
+error: rust-call ABI is subject to change (see issue #29625)
+  --> $DIR/feature-gate-abi.rs:33:5
+   |
+33 |     extern "rust-call" fn m4(); //~ ERROR rust-call ABI is subject to change
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(unboxed_closures)] to the crate attributes to enable
+
+error: msp430-interrupt ABI is experimental and subject to change (see issue #38487)
+  --> $DIR/feature-gate-abi.rs:34:5
+   |
+34 |     extern "msp430-interrupt" fn m5(); //~ ERROR msp430-interrupt ABI is experimental
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_msp430_interrupt)] to the crate attributes to enable
+
+error: PTX ABIs are experimental and subject to change
+  --> $DIR/feature-gate-abi.rs:35:5
+   |
+35 |     extern "ptx-kernel" fn m6(); //~ ERROR PTX ABIs are experimental and subject to change
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_ptx)] to the crate attributes to enable
+
+error: x86-interrupt ABI is experimental and subject to change (see issue #40180)
+  --> $DIR/feature-gate-abi.rs:36:5
+   |
+36 |     extern "x86-interrupt" fn m7(); //~ ERROR x86-interrupt ABI is experimental
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_x86_interrupt)] to the crate attributes to enable
+
+error: thiscall is experimental and subject to change
+  --> $DIR/feature-gate-abi.rs:37:5
+   |
+37 |     extern "thiscall" fn m8(); //~ ERROR thiscall is experimental and subject to change
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_thiscall)] to the crate attributes to enable
+
+error: intrinsics are subject to change
+  --> $DIR/feature-gate-abi.rs:39:5
+   |
+39 |     extern "rust-intrinsic" fn dm1() {} //~ ERROR intrinsics are subject to change
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(intrinsics)] to the crate attributes to enable
+
+error: platform intrinsics are experimental and possibly buggy (see issue #27731)
+  --> $DIR/feature-gate-abi.rs:40:5
+   |
+40 |     extern "platform-intrinsic" fn dm2() {} //~ ERROR platform intrinsics are experimental
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(platform_intrinsics)] to the crate attributes to enable
+
+error: vectorcall is experimental and subject to change
+  --> $DIR/feature-gate-abi.rs:41:5
+   |
+41 |     extern "vectorcall" fn dm3() {} //~ ERROR vectorcall is experimental and subject to change
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_vectorcall)] to the crate attributes to enable
+
+error: rust-call ABI is subject to change (see issue #29625)
+  --> $DIR/feature-gate-abi.rs:42:5
+   |
+42 |     extern "rust-call" fn dm4() {} //~ ERROR rust-call ABI is subject to change
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(unboxed_closures)] to the crate attributes to enable
+
+error: msp430-interrupt ABI is experimental and subject to change (see issue #38487)
+  --> $DIR/feature-gate-abi.rs:43:5
+   |
+43 |     extern "msp430-interrupt" fn dm5() {} //~ ERROR msp430-interrupt ABI is experimental
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_msp430_interrupt)] to the crate attributes to enable
+
+error: PTX ABIs are experimental and subject to change
+  --> $DIR/feature-gate-abi.rs:44:5
+   |
+44 |     extern "ptx-kernel" fn dm6() {} //~ ERROR PTX ABIs are experimental and subject to change
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_ptx)] to the crate attributes to enable
+
+error: x86-interrupt ABI is experimental and subject to change (see issue #40180)
+  --> $DIR/feature-gate-abi.rs:45:5
+   |
+45 |     extern "x86-interrupt" fn dm7() {} //~ ERROR x86-interrupt ABI is experimental
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_x86_interrupt)] to the crate attributes to enable
+
+error: thiscall is experimental and subject to change
+  --> $DIR/feature-gate-abi.rs:46:5
+   |
+46 |     extern "thiscall" fn dm8() {} //~ ERROR thiscall is experimental and subject to change
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_thiscall)] to the crate attributes to enable
+
+error: intrinsics are subject to change
+  --> $DIR/feature-gate-abi.rs:53:5
+   |
+53 |     extern "rust-intrinsic" fn m1() {} //~ ERROR intrinsics are subject to change
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(intrinsics)] to the crate attributes to enable
+
+error: platform intrinsics are experimental and possibly buggy (see issue #27731)
+  --> $DIR/feature-gate-abi.rs:54:5
+   |
+54 |     extern "platform-intrinsic" fn m2() {} //~ ERROR platform intrinsics are experimental
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(platform_intrinsics)] to the crate attributes to enable
+
+error: vectorcall is experimental and subject to change
+  --> $DIR/feature-gate-abi.rs:55:5
+   |
+55 |     extern "vectorcall" fn m3() {} //~ ERROR vectorcall is experimental and subject to change
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_vectorcall)] to the crate attributes to enable
+
+error: rust-call ABI is subject to change (see issue #29625)
+  --> $DIR/feature-gate-abi.rs:56:5
+   |
+56 |     extern "rust-call" fn m4() {} //~ ERROR rust-call ABI is subject to change
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(unboxed_closures)] to the crate attributes to enable
+
+error: msp430-interrupt ABI is experimental and subject to change (see issue #38487)
+  --> $DIR/feature-gate-abi.rs:57:5
+   |
+57 |     extern "msp430-interrupt" fn m5() {} //~ ERROR msp430-interrupt ABI is experimental
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_msp430_interrupt)] to the crate attributes to enable
+
+error: PTX ABIs are experimental and subject to change
+  --> $DIR/feature-gate-abi.rs:58:5
+   |
+58 |     extern "ptx-kernel" fn m6() {} //~ ERROR PTX ABIs are experimental and subject to change
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_ptx)] to the crate attributes to enable
+
+error: x86-interrupt ABI is experimental and subject to change (see issue #40180)
+  --> $DIR/feature-gate-abi.rs:59:5
+   |
+59 |     extern "x86-interrupt" fn m7() {} //~ ERROR x86-interrupt ABI is experimental
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_x86_interrupt)] to the crate attributes to enable
+
+error: thiscall is experimental and subject to change
+  --> $DIR/feature-gate-abi.rs:60:5
+   |
+60 |     extern "thiscall" fn m8() {} //~ ERROR thiscall is experimental and subject to change
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_thiscall)] to the crate attributes to enable
+
+error: intrinsics are subject to change
+  --> $DIR/feature-gate-abi.rs:65:5
+   |
+65 |     extern "rust-intrinsic" fn im1() {} //~ ERROR intrinsics are subject to change
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(intrinsics)] to the crate attributes to enable
+
+error: platform intrinsics are experimental and possibly buggy (see issue #27731)
+  --> $DIR/feature-gate-abi.rs:66:5
+   |
+66 |     extern "platform-intrinsic" fn im2() {} //~ ERROR platform intrinsics are experimental
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(platform_intrinsics)] to the crate attributes to enable
+
+error: vectorcall is experimental and subject to change
+  --> $DIR/feature-gate-abi.rs:67:5
+   |
+67 |     extern "vectorcall" fn im3() {} //~ ERROR vectorcall is experimental and subject to change
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_vectorcall)] to the crate attributes to enable
+
+error: rust-call ABI is subject to change (see issue #29625)
+  --> $DIR/feature-gate-abi.rs:68:5
+   |
+68 |     extern "rust-call" fn im4() {} //~ ERROR rust-call ABI is subject to change
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(unboxed_closures)] to the crate attributes to enable
+
+error: msp430-interrupt ABI is experimental and subject to change (see issue #38487)
+  --> $DIR/feature-gate-abi.rs:69:5
+   |
+69 |     extern "msp430-interrupt" fn im5() {} //~ ERROR msp430-interrupt ABI is experimental
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_msp430_interrupt)] to the crate attributes to enable
+
+error: PTX ABIs are experimental and subject to change
+  --> $DIR/feature-gate-abi.rs:70:5
+   |
+70 |     extern "ptx-kernel" fn im6() {} //~ ERROR PTX ABIs are experimental and subject to change
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_ptx)] to the crate attributes to enable
+
+error: x86-interrupt ABI is experimental and subject to change (see issue #40180)
+  --> $DIR/feature-gate-abi.rs:71:5
+   |
+71 |     extern "x86-interrupt" fn im7() {} //~ ERROR x86-interrupt ABI is experimental
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_x86_interrupt)] to the crate attributes to enable
+
+error: thiscall is experimental and subject to change
+  --> $DIR/feature-gate-abi.rs:72:5
+   |
+72 |     extern "thiscall" fn im8() {} //~ ERROR thiscall is experimental and subject to change
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_thiscall)] to the crate attributes to enable
+
+error: intrinsics are subject to change
+  --> $DIR/feature-gate-abi.rs:76:11
+   |
+76 | type A1 = extern "rust-intrinsic" fn(); //~ ERROR intrinsics are subject to change
+   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(intrinsics)] to the crate attributes to enable
+
+error: platform intrinsics are experimental and possibly buggy (see issue #27731)
+  --> $DIR/feature-gate-abi.rs:77:11
+   |
+77 | type A2 = extern "platform-intrinsic" fn(); //~ ERROR platform intrinsics are experimental
+   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(platform_intrinsics)] to the crate attributes to enable
+
+error: vectorcall is experimental and subject to change
+  --> $DIR/feature-gate-abi.rs:78:11
+   |
+78 | type A3 = extern "vectorcall" fn(); //~ ERROR vectorcall is experimental and subject to change
+   |           ^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_vectorcall)] to the crate attributes to enable
+
+error: rust-call ABI is subject to change (see issue #29625)
+  --> $DIR/feature-gate-abi.rs:79:11
+   |
+79 | type A4 = extern "rust-call" fn(); //~ ERROR rust-call ABI is subject to change
+   |           ^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(unboxed_closures)] to the crate attributes to enable
+
+error: msp430-interrupt ABI is experimental and subject to change (see issue #38487)
+  --> $DIR/feature-gate-abi.rs:80:11
+   |
+80 | type A5 = extern "msp430-interrupt" fn(); //~ ERROR msp430-interrupt ABI is experimental
+   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_msp430_interrupt)] to the crate attributes to enable
+
+error: PTX ABIs are experimental and subject to change
+  --> $DIR/feature-gate-abi.rs:81:11
+   |
+81 | type A6 = extern "ptx-kernel" fn (); //~ ERROR PTX ABIs are experimental and subject to change
+   |           ^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_ptx)] to the crate attributes to enable
+
+error: x86-interrupt ABI is experimental and subject to change (see issue #40180)
+  --> $DIR/feature-gate-abi.rs:82:11
+   |
+82 | type A7 = extern "x86-interrupt" fn(); //~ ERROR x86-interrupt ABI is experimental
+   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_x86_interrupt)] to the crate attributes to enable
+
+error: thiscall is experimental and subject to change
+  --> $DIR/feature-gate-abi.rs:83:11
+   |
+83 | type A8 = extern "thiscall" fn(); //~ ERROR thiscall is experimental and subject to change
+   |           ^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_thiscall)] to the crate attributes to enable
+
+error: intrinsics are subject to change
+  --> $DIR/feature-gate-abi.rs:86:1
+   |
+86 | extern "rust-intrinsic" {} //~ ERROR intrinsics are subject to change
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(intrinsics)] to the crate attributes to enable
+
+error: platform intrinsics are experimental and possibly buggy (see issue #27731)
+  --> $DIR/feature-gate-abi.rs:87:1
+   |
+87 | extern "platform-intrinsic" {} //~ ERROR platform intrinsics are experimental
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(platform_intrinsics)] to the crate attributes to enable
+
+error: vectorcall is experimental and subject to change
+  --> $DIR/feature-gate-abi.rs:88:1
+   |
+88 | extern "vectorcall" {} //~ ERROR vectorcall is experimental and subject to change
+   | ^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_vectorcall)] to the crate attributes to enable
+
+error: rust-call ABI is subject to change (see issue #29625)
+  --> $DIR/feature-gate-abi.rs:89:1
+   |
+89 | extern "rust-call" {} //~ ERROR rust-call ABI is subject to change
+   | ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(unboxed_closures)] to the crate attributes to enable
+
+error: msp430-interrupt ABI is experimental and subject to change (see issue #38487)
+  --> $DIR/feature-gate-abi.rs:90:1
+   |
+90 | extern "msp430-interrupt" {} //~ ERROR msp430-interrupt ABI is experimental
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_msp430_interrupt)] to the crate attributes to enable
+
+error: PTX ABIs are experimental and subject to change
+  --> $DIR/feature-gate-abi.rs:91:1
+   |
+91 | extern "ptx-kernel" {} //~ ERROR PTX ABIs are experimental and subject to change
+   | ^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_ptx)] to the crate attributes to enable
+
+error: x86-interrupt ABI is experimental and subject to change (see issue #40180)
+  --> $DIR/feature-gate-abi.rs:92:1
+   |
+92 | extern "x86-interrupt" {} //~ ERROR x86-interrupt ABI is experimental
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_x86_interrupt)] to the crate attributes to enable
+
+error: thiscall is experimental and subject to change
+  --> $DIR/feature-gate-abi.rs:93:1
+   |
+93 | extern "thiscall" {} //~ ERROR thiscall is experimental and subject to change
+   | ^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(abi_thiscall)] to the crate attributes to enable
+
+error: aborting due to 56 previous errors
+

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

@@ -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-allocator_internals.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/ui/feature-gate-allow-internal-unsafe-nested-macro.stderr

@@ -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-allow-internal-unstable-nested-macro.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/ui/feature-gate-allow-internal-unstable-struct.stderr

@@ -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-allow-internal-unstable.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/ui/feature-gate-allow_fail.stderr

@@ -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-arbitrary-self-types.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/ui/feature-gate-assoc-type-defaults.stderr

@@ -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-box-expr.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/ui/feature-gate-box-pat.stderr

@@ -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-catch_expr.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/ui/feature-gate-cfg-target-feature.stderr

@@ -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-cfg-target-has-atomic.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/ui/feature-gate-cfg-target-thread-local.stderr

@@ -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-cfg-target-vendor.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/ui/feature-gate-clone-closures.stderr

@@ -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
+

src/test/ui/feature-gate-compiler-builtins.stderr

@@ -0,0 +1,10 @@
+error: the `#[compiler_builtins]` attribute is used to identify the `compiler_builtins` crate which contains compiler-rt intrinsics and will never be stable
+  --> $DIR/feature-gate-compiler-builtins.rs:11:1
+   |
+11 | #![compiler_builtins] //~ ERROR the `#[compiler_builtins]` attribute is
+   | ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(compiler_builtins)] to the crate attributes to enable
+
+error: aborting due to previous error
+

src/test/ui/feature-gate-const-indexing.stderr

@@ -0,0 +1,8 @@
+error[E0080]: constant evaluation error
+  --> $DIR/feature-gate-const-indexing.rs:16:24
+   |
+16 |     const BLUB: [i32; (ARR[0] - 41) as usize] = [5]; //~ ERROR constant evaluation error
+   |                        ^^^^^^ the index operation on const values is unstable
+
+error: aborting due to previous error
+

src/test/ui/feature-gate-copy-closures.stderr

@@ -0,0 +1,12 @@
+error[E0382]: use of moved value: `hello`
+  --> $DIR/feature-gate-copy-closures.rs:18:9
+   |
+17 |     let b = hello;
+   |         - value moved here
+18 |     let c = hello; //~ ERROR use of moved value: `hello` [E0382]
+   |         ^ value used here after move
+   |
+   = note: move occurs because `hello` has type `[closure@$DIR/feature-gate-copy-closures.rs:13:17: 15:6 a:&i32]`, which does not implement the `Copy` trait
+
+error: aborting due to previous error
+

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

@@ -0,0 +1,10 @@
+error: `crate` in paths is experimental (see issue #45477)
+  --> $DIR/feature-gate-crate_in_paths.rs:14:15
+   |
+14 |     let _ = ::crate::S; //~ ERROR `crate` in paths is experimental
+   |               ^^^^^
+   |
+   = help: add #![feature(crate_in_paths)] to the crate attributes to enable
+
+error: aborting due to previous error
+

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

@@ -0,0 +1,10 @@
+error: `crate` visibility modifier is experimental (see issue #45388)
+  --> $DIR/feature-gate-crate_visibility_modifier.rs:11:1
+   |
+11 | crate struct Bender { //~ ERROR `crate` visibility modifier is experimental
+   | ^^^^^
+   |
+   = help: add #![feature(crate_visibility_modifier)] to the crate attributes to enable
+
+error: aborting due to previous error
+

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

@@ -0,0 +1,10 @@
+error: `macro` is experimental (see issue #39412)
+  --> $DIR/feature-gate-decl_macro.rs:13:1
+   |
+13 | macro m() {} //~ ERROR `macro` is experimental (see issue #39412)
+   | ^^^^^^^^^^^^
+   |
+   = help: add #![feature(decl_macro)] to the crate attributes to enable
+
+error: aborting due to previous error
+

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

@@ -0,0 +1,10 @@
+error: #[doc(cfg(...))] is experimental (see issue #43781)
+  --> $DIR/feature-gate-doc_cfg.rs:11:1
+   |
+11 | #[doc(cfg(unix))] //~ ERROR: #[doc(cfg(...))] is experimental
+   | ^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(doc_cfg)] to the crate attributes to enable
+
+error: aborting due to previous error
+

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

@@ -0,0 +1,10 @@
+error: #[doc(masked)] is experimental (see issue #44027)
+  --> $DIR/feature-gate-doc_masked.rs:11:1
+   |
+11 | #[doc(masked)] //~ ERROR: #[doc(masked)] is experimental
+   | ^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(doc_masked)] to the crate attributes to enable
+
+error: aborting due to previous error
+

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

@@ -0,0 +1,10 @@
+error: #[doc(spotlight)] is experimental (see issue #45040)
+  --> $DIR/feature-gate-doc_spotlight.rs:11:1
+   |
+11 | #[doc(spotlight)] //~ ERROR: #[doc(spotlight)] is experimental
+   | ^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(doc_spotlight)] to the crate attributes to enable
+
+error: aborting due to previous error
+

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

@@ -0,0 +1,10 @@
+error: `..=` syntax in patterns is experimental (see issue #28237)
+  --> $DIR/feature-gate-dotdoteq_in_patterns.rs:13:9
+   |
+13 |         0 ..= 3 => {} //~ ERROR `..=` syntax in patterns is experimental
+   |         ^^^^^^^
+   |
+   = help: add #![feature(dotdoteq_in_patterns)] to the crate attributes to enable
+
+error: aborting due to previous error
+

src/test/ui/feature-gate-dropck-ugeh-2.stderr

@@ -0,0 +1,14 @@
+error: 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-2.rs:17:5
+   |
+17 |     #[unsafe_destructor_blind_to_params]
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   |
+note: lint level defined here
+  --> $DIR/feature-gate-dropck-ugeh-2.rs:11:9
+   |
+11 | #![deny(deprecated)]
+   |         ^^^^^^^^^^
+
+error: aborting due to previous error
+

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

@@ -0,0 +1,10 @@
+error: 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:29:5
+   |
+29 |     #[unsafe_destructor_blind_to_params] // This is the UGEH attribute
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(dropck_parametricity)] to the crate attributes to enable
+
+error: aborting due to previous error
+

src/test/ui/feature-gate-dyn-trait.stderr

@@ -0,0 +1,10 @@
+error: `dyn Trait` syntax is unstable (see issue #44662)
+  --> $DIR/feature-gate-dyn-trait.rs:12:14
+   |
+12 | type A = Box<dyn Trait>; //~ ERROR `dyn Trait` syntax is unstable
+   |              ^^^^^^^^^
+   |
+   = help: add #![feature(dyn_trait)] to the crate attributes to enable
+
+error: aborting due to previous error
+

src/test/ui/feature-gate-exclusive-range-pattern.stderr

@@ -0,0 +1,10 @@
+error: exclusive range pattern syntax is experimental (see issue #37854)
+  --> $DIR/feature-gate-exclusive-range-pattern.rs:13:9
+   |
+13 |         0 .. 3 => {} //~ ERROR exclusive range pattern syntax is experimental
+   |         ^^^^^^
+   |
+   = help: add #![feature(exclusive_range_pattern)] to the crate attributes to enable
+
+error: aborting due to previous error
+

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

@@ -0,0 +1,10 @@
+error: extern types are experimental (see issue #43467)
+  --> $DIR/feature-gate-extern_types.rs:12:5
+   |
+12 |     type T; //~ ERROR extern types are experimental
+   |     ^^^^^^^
+   |
+   = help: add #![feature(extern_types)] to the crate attributes to enable
+
+error: aborting due to previous error
+

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

@@ -0,0 +1,10 @@
+error: #[doc(include = "...")] is experimental (see issue #44732)
+  --> $DIR/feature-gate-external_doc.rs:11:1
+   |
+11 | #[doc(include="asdf.md")] //~ ERROR: #[doc(include = "...")] is experimental
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(external_doc)] to the crate attributes to enable
+
+error: aborting due to previous error
+

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

@@ -0,0 +1,14 @@
+error: unstable feature
+  --> $DIR/feature-gate-feature-gate.rs:12:12
+   |
+12 | #![feature(intrinsics)] //~ ERROR unstable feature
+   |            ^^^^^^^^^^
+   |
+note: lint level defined here
+  --> $DIR/feature-gate-feature-gate.rs:11:11
+   |
+11 | #![forbid(unstable_features)]
+   |           ^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+

src/test/ui/feature-gate-fn_must_use-cap-lints-allow.stderr

@@ -0,0 +1,6 @@
+error: compilation successful
+  --> $DIR/feature-gate-fn_must_use-cap-lints-allow.rs:22:1
+   |
+22 | fn main() {} //~ ERROR compilation successful
+   | ^^^^^^^^^^^^
+

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

@@ -0,0 +1,22 @@
+warning: `#[must_use]` on methods is experimental (see issue #43302)
+  --> $DIR/feature-gate-fn_must_use.rs:16:5
+   |
+16 |     #[must_use] //~ WARN `#[must_use]` on methods is experimental
+   |     ^^^^^^^^^^^
+   |
+   = help: add #![feature(fn_must_use)] to the crate attributes to enable
+
+warning: `#[must_use]` on functions is experimental (see issue #43302)
+  --> $DIR/feature-gate-fn_must_use.rs:20:1
+   |
+20 | #[must_use] //~ WARN `#[must_use]` on functions is experimental
+   | ^^^^^^^^^^^
+   |
+   = help: add #![feature(fn_must_use)] to the crate attributes to enable
+
+error: compilation successful
+  --> $DIR/feature-gate-fn_must_use.rs:31:1
+   |
+31 | fn main() {} //~ ERROR compilation successful
+   | ^^^^^^^^^^^^
+

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

@@ -0,0 +1,10 @@
+error: the `#[fundamental]` attribute is an experimental feature (see issue #29635)
+  --> $DIR/feature-gate-fundamental.rs:11:1
+   |
+11 | #[fundamental] //~ ERROR the `#[fundamental]` attribute is an experimental feature
+   | ^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(fundamental)] to the crate attributes to enable
+
+error: aborting due to previous error
+

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

@@ -0,0 +1,10 @@
+error: yield syntax is experimental
+  --> $DIR/feature-gate-generators.rs:12:5
+   |
+12 |     yield true; //~ ERROR yield syntax is experimental
+   |     ^^^^^^^^^^
+   |
+   = help: add #![feature(generators)] to the crate attributes to enable
+
+error: aborting due to previous error
+

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

@@ -0,0 +1,34 @@
+error: generic associated types are unstable (see issue #44265)
+  --> $DIR/feature-gate-generic_associated_types.rs:14:5
+   |
+14 |     type Pointer<T>: Deref<Target = T>;
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(generic_associated_types)] to the crate attributes to enable
+
+error: generic associated types are unstable (see issue #44265)
+  --> $DIR/feature-gate-generic_associated_types.rs:16:5
+   |
+16 |     type Pointer2<T>: Deref<Target = T> where T: Clone, U: Clone;
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(generic_associated_types)] to the crate attributes to enable
+
+error: generic associated types are unstable (see issue #44265)
+  --> $DIR/feature-gate-generic_associated_types.rs:22:5
+   |
+22 |     type Pointer<usize> = Box<usize>;
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(generic_associated_types)] to the crate attributes to enable
+
+error: generic associated types are unstable (see issue #44265)
+  --> $DIR/feature-gate-generic_associated_types.rs:24:5
+   |
+24 |     type Pointer2<u32> = Box<u32>;
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(generic_associated_types)] to the crate attributes to enable
+
+error: aborting due to 4 previous errors
+

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

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

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

@@ -0,0 +1,10 @@
+error: `global_asm!` is not stable enough for use and is subject to change (see issue #35119)
+  --> $DIR/feature-gate-global_asm.rs:11:1
+   |
+11 | global_asm!(""); //~ ERROR `global_asm!` is not stable
+   | ^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(global_asm)] to the crate attributes to enable
+
+error: aborting due to previous error
+

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

@@ -0,0 +1,104 @@
+error[E0261]: use of undeclared lifetime name `'x`
+  --> $DIR/feature-gate-in_band_lifetimes.rs:13:12
+   |
+13 | fn foo(x: &'x u8) -> &'x u8 { x }
+   |            ^^ undeclared lifetime
+
+error[E0261]: use of undeclared lifetime name `'x`
+  --> $DIR/feature-gate-in_band_lifetimes.rs:13:23
+   |
+13 | fn foo(x: &'x u8) -> &'x u8 { x }
+   |                       ^^ undeclared lifetime
+
+error[E0261]: use of undeclared lifetime name `'b`
+  --> $DIR/feature-gate-in_band_lifetimes.rs:25:12
+   |
+25 | impl<'a> X<'b> {
+   |            ^^ undeclared lifetime
+
+error[E0261]: use of undeclared lifetime name `'b`
+  --> $DIR/feature-gate-in_band_lifetimes.rs:27:27
+   |
+27 |     fn inner_2(&self) -> &'b u8 {
+   |                           ^^ undeclared lifetime
+
+error[E0261]: use of undeclared lifetime name `'b`
+  --> $DIR/feature-gate-in_band_lifetimes.rs:33:8
+   |
+33 | impl X<'b> {
+   |        ^^ undeclared lifetime
+
+error[E0261]: use of undeclared lifetime name `'b`
+  --> $DIR/feature-gate-in_band_lifetimes.rs:35:27
+   |
+35 |     fn inner_3(&self) -> &'b u8 {
+   |                           ^^ undeclared lifetime
+
+error[E0261]: use of undeclared lifetime name `'a`
+  --> $DIR/feature-gate-in_band_lifetimes.rs:43:9
+   |
+43 | impl Y<&'a u8> {
+   |         ^^ undeclared lifetime
+
+error[E0261]: use of undeclared lifetime name `'a`
+  --> $DIR/feature-gate-in_band_lifetimes.rs:45:25
+   |
+45 |     fn inner(&self) -> &'a u8 {
+   |                         ^^ undeclared lifetime
+
+error[E0261]: use of undeclared lifetime name `'b`
+  --> $DIR/feature-gate-in_band_lifetimes.rs:53:27
+   |
+53 |     fn any_lifetime() -> &'b u8;
+   |                           ^^ undeclared lifetime
+
+error[E0261]: use of undeclared lifetime name `'b`
+  --> $DIR/feature-gate-in_band_lifetimes.rs:55:27
+   |
+55 |     fn borrowed_lifetime(&'b self) -> &'b u8;
+   |                           ^^ undeclared lifetime
+
+error[E0261]: use of undeclared lifetime name `'b`
+  --> $DIR/feature-gate-in_band_lifetimes.rs:55:40
+   |
+55 |     fn borrowed_lifetime(&'b self) -> &'b u8;
+   |                                        ^^ undeclared lifetime
+
+error[E0261]: use of undeclared lifetime name `'a`
+  --> $DIR/feature-gate-in_band_lifetimes.rs:60:14
+   |
+60 | impl MyTrait<'a> for Y<&'a u8> {
+   |              ^^ undeclared lifetime
+
+error[E0261]: use of undeclared lifetime name `'a`
+  --> $DIR/feature-gate-in_band_lifetimes.rs:60:25
+   |
+60 | impl MyTrait<'a> for Y<&'a u8> {
+   |                         ^^ undeclared lifetime
+
+error[E0261]: use of undeclared lifetime name `'a`
+  --> $DIR/feature-gate-in_band_lifetimes.rs:63:31
+   |
+63 |     fn my_lifetime(&self) -> &'a u8 { self.0 }
+   |                               ^^ undeclared lifetime
+
+error[E0261]: use of undeclared lifetime name `'b`
+  --> $DIR/feature-gate-in_band_lifetimes.rs:65:27
+   |
+65 |     fn any_lifetime() -> &'b u8 { &0 }
+   |                           ^^ undeclared lifetime
+
+error[E0261]: use of undeclared lifetime name `'b`
+  --> $DIR/feature-gate-in_band_lifetimes.rs:67:27
+   |
+67 |     fn borrowed_lifetime(&'b self) -> &'b u8 { &*self.0 }
+   |                           ^^ undeclared lifetime
+
+error[E0261]: use of undeclared lifetime name `'b`
+  --> $DIR/feature-gate-in_band_lifetimes.rs:67:40
+   |
+67 |     fn borrowed_lifetime(&'b self) -> &'b u8 { &*self.0 }
+   |                                        ^^ undeclared lifetime
+
+error: aborting due to 17 previous errors
+

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

@@ -0,0 +1,21 @@
+error: intrinsics are subject to change
+  --> $DIR/feature-gate-intrinsics.rs:11:1
+   |
+11 | / extern "rust-intrinsic" {   //~ ERROR intrinsics are subject to change
+12 | |     fn bar();
+13 | | }
+   | |_^
+   |
+   = help: add #![feature(intrinsics)] to the crate attributes to enable
+
+error: intrinsics are subject to change
+  --> $DIR/feature-gate-intrinsics.rs:15:1
+   |
+15 | / extern "rust-intrinsic" fn baz() {  //~ ERROR intrinsics are subject to change
+16 | | }
+   | |_^
+   |
+   = help: add #![feature(intrinsics)] to the crate attributes to enable
+
+error: aborting due to 2 previous errors
+

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

@@ -0,0 +1,10 @@
+error: language items are subject to change
+  --> $DIR/feature-gate-lang-items.rs:11:1
+   |
+11 | #[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
+

src/test/ui/feature-gate-linker-flavor.stderr

@@ -0,0 +1,10 @@
+error: the `#[used]` attribute is an experimental feature (see issue #40289)
+  --> $DIR/feature-gate-linker-flavor.rs:16:1
+   |
+16 | #[used]
+   | ^^^^^^^
+   |
+   = help: add #![feature(used)] to the crate attributes to enable
+
+error: aborting due to previous error
+

src/test/ui/feature-gate-macro-vis-matcher.stderr

@@ -0,0 +1,10 @@
+error: :vis fragment specifier is experimental and subject to change (see issue #41022)
+  --> $DIR/feature-gate-macro-vis-matcher.rs:14:19
+   |
+14 | macro_rules! m { ($v:vis) => {} }
+   |                   ^^^^^^
+   |
+   = help: add #![feature(macro_vis_matcher)] to the crate attributes to enable
+
+error: aborting due to previous error
+

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

@@ -0,0 +1,10 @@
+error: declaration of a nonstandard #[main] function may change over time, for now a top-level `fn main()` is required (see issue #29634)
+  --> $DIR/feature-gate-main.rs:12:1
+   |
+12 | fn foo() {} //~ ERROR: declaration of a nonstandard #[main] function may change over time
+   | ^^^^^^^^^^^
+   |
+   = help: add #![feature(main)] to the crate attributes to enable
+
+error: aborting due to previous error
+