Rollup merge of rust-lang#55601 - petrochenkov:featissue, r=pnkfelix

Fix tracking issue numbers for some unstable features

And also remove deprecated unstable `#[panic_implementation]` attribute that was superseded by stable `#[panic_handler]` and doesn't have an open tracking issue.

Author: kennytm

src/librustc/middle/dead.rs

@@ -291,10 +291,8 @@ fn has_allow_dead_code_or_lang_attr(tcx: TyCtxt<'_, '_, '_>,
         return true;
     }
 
-    // (To be) stable attribute for #[lang = "panic_impl"]
-    if attr::contains_name(attrs, "panic_implementation") ||
-        attr::contains_name(attrs, "panic_handler")
-    {
+    // Stable attribute for #[lang = "panic_impl"]
+    if attr::contains_name(attrs, "panic_handler") {
         return true;
     }
 

src/librustc/middle/lang_items.rs

@@ -204,9 +204,7 @@ pub fn extract(attrs: &[ast::Attribute]) -> Option<(Symbol, Span)> {
             if let Some(value) = attribute.value_str() {
                 return Some((value, attribute.span));
             }
-        } else if attribute.check_name("panic_implementation") ||
-            attribute.check_name("panic_handler")
-        {
+        } else if attribute.check_name("panic_handler") {
             return Some((Symbol::intern("panic_impl"), attribute.span))
         } else if attribute.check_name("alloc_error_handler") {
             return Some((Symbol::intern("oom"), attribute.span))

src/librustc_mir/monomorphize/partitioning.rs

@@ -511,7 +511,7 @@ fn mono_item_visibility(
         //
         // * First is weak lang items. These are basically mechanisms for
         //   libcore to forward-reference symbols defined later in crates like
-        //   the standard library or `#[panic_implementation]` definitions. The
+        //   the standard library or `#[panic_handler]` definitions. The
         //   definition of these weak lang items needs to be referenceable by
         //   libcore, so we're no longer a candidate for internalization.
         //   Removal of these functions can't be done by LLVM but rather must be

src/librustc_typeck/check/mod.rs

@@ -1167,7 +1167,7 @@ fn check_fn<'a, 'gcx, 'tcx>(inherited: &'a Inherited<'a, 'gcx, 'tcx>,
         }
     }
 
-    // Check that a function marked as `#[panic_implementation]` has signature `fn(&PanicInfo) -> !`
+    // Check that a function marked as `#[panic_handler]` has signature `fn(&PanicInfo) -> !`
     if let Some(panic_impl_did) = fcx.tcx.lang_items().panic_impl() {
         if panic_impl_did == fcx.tcx.hir.local_def_id(fn_id) {
             if let Some(panic_info_did) = fcx.tcx.lang_items().panic_info() {

src/libsyntax/feature_gate.rs

@@ -349,7 +349,7 @@ declare_features! (
     (active, abi_thiscall, "1.19.0", None, None),
 
     // Allows a test to fail without failing the whole suite
-    (active, allow_fail, "1.19.0", Some(42219), None),
+    (active, allow_fail, "1.19.0", Some(46488), None),
 
     // Allows unsized tuple coercion.
     (active, unsized_tuple_coercion, "1.20.0", Some(42877), None),
@@ -376,7 +376,7 @@ declare_features! (
     (active, non_exhaustive, "1.22.0", Some(44109), None),
 
     // `crate` as visibility modifier, synonymous to `pub(crate)`
-    (active, crate_visibility_modifier, "1.23.0", Some(45388), None),
+    (active, crate_visibility_modifier, "1.23.0", Some(53120), None),
 
     // extern types
     (active, extern_types, "1.23.0", Some(43467), None),
@@ -391,13 +391,13 @@ declare_features! (
     (active, generic_associated_types, "1.23.0", Some(44265), None),
 
     // `extern` in paths
-    (active, extern_in_paths, "1.23.0", Some(44660), None),
+    (active, extern_in_paths, "1.23.0", Some(55600), None),
 
     // Use `?` as the Kleene "at most one" operator
     (active, macro_at_most_once_rep, "1.25.0", Some(48075), None),
 
     // Infer static outlives requirements; RFC 2093
-    (active, infer_static_outlives_requirements, "1.26.0", Some(44493), None),
+    (active, infer_static_outlives_requirements, "1.26.0", Some(54185), None),
 
     // Multiple patterns with `|` in `if let` and `while let`
     (active, if_while_or_patterns, "1.26.0", Some(48215), None),
@@ -448,9 +448,6 @@ declare_features! (
     // Integer match exhaustiveness checking
     (active, exhaustive_integer_patterns, "1.30.0", Some(50907), None),
 
-    // RFC 2070: #[panic_implementation] / #[panic_handler]
-    (active, panic_implementation, "1.28.0", Some(44489), None),
-
     // #[doc(keyword = "...")]
     (active, doc_keyword, "1.28.0", Some(51315), None),
 
@@ -466,7 +463,7 @@ declare_features! (
     (active, test_2018_feature, "1.31.0", Some(0), Some(Edition::Edition2018)),
 
     // Support for arbitrary delimited token streams in non-macro attributes
-    (active, unrestricted_attribute_tokens, "1.30.0", Some(44690), None),
+    (active, unrestricted_attribute_tokens, "1.30.0", Some(55208), None),
 
     // Allows `use x::y;` to resolve through `self::x`, not just `::x`
     (active, uniform_paths, "1.30.0", Some(53130), None),
@@ -503,7 +500,7 @@ declare_features! (
     (active, underscore_const_names, "1.31.0", Some(54912), None),
 
     // `extern crate foo as bar;` puts `bar` into extern prelude.
-    (active, extern_crate_item_prelude, "1.31.0", Some(54658), None),
+    (active, extern_crate_item_prelude, "1.31.0", Some(55599), None),
 
     // `reason = ` in lint attributes and `expect` lint attribute
     (active, lint_reasons, "1.31.0", Some(54503), None),
@@ -541,6 +538,8 @@ declare_features! (
      Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
     (removed, proc_macro_gen, "1.27.0", Some(54727), None,
      Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
+    (removed, panic_implementation, "1.28.0", Some(44489), None,
+     Some("subsumed by `#[panic_handler]`")),
 );
 
 declare_features! (
@@ -1160,16 +1159,6 @@ pub const BUILTIN_ATTRIBUTES: &'static [(&'static str, AttributeType, AttributeG
                                    "infer 'static lifetime requirements",
                                    cfg_fn!(infer_static_outlives_requirements))),
 
-    // RFC 2070 (deprecated attribute name)
-    ("panic_implementation",
-     Normal,
-     Gated(Stability::Deprecated("https://github.com/rust-lang/rust/issues/44489\
-                                  #issuecomment-415140224",
-                                 Some("replace this attribute with `#[panic_handler]`")),
-           "panic_implementation",
-           "this attribute was renamed to `panic_handler`",
-           cfg_fn!(panic_implementation))),
-
     // RFC 2070
     ("panic_handler", Normal, Ungated),
 

src/test/run-make/wasm-symbols-not-imported/foo.rs

@@ -9,8 +9,6 @@
 // except according to those terms.
 
 #![crate_type = "cdylib"]
-
-#![feature(panic_implementation)]
 #![no_std]
 
 use core::panic::PanicInfo;
@@ -20,7 +18,7 @@ pub extern fn foo() {
     panic!()
 }
 
-#[panic_implementation]
+#[panic_handler]
 fn panic(_info: &PanicInfo) -> ! {
     loop {}
 }

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

@@ -1,4 +1,4 @@
-error[E0658]: allow_fail attribute is currently unstable (see issue #42219)
+error[E0658]: allow_fail attribute is currently unstable (see issue #46488)
   --> $DIR/feature-gate-allow_fail.rs:13:1
    |
 LL | #[allow_fail] //~ ERROR allow_fail attribute is currently unstable

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

@@ -1,4 +1,4 @@
-error[E0658]: `crate` visibility modifier is experimental (see issue #45388)
+error[E0658]: `crate` visibility modifier is experimental (see issue #53120)
   --> $DIR/feature-gate-crate_visibility_modifier.rs:11:1
    |
 LL | crate struct Bender { //~ ERROR `crate` visibility modifier is experimental

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

@@ -1,68 +1,68 @@
-error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #54658)
+error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #55599)
   --> $DIR/feature-gate-extern_crate_item_prelude.rs:26:9
    |
 LL |     use alloc;
    |         ^^^^^
    |
    = help: add #![feature(extern_crate_item_prelude)] to the crate attributes to enable
 
-error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #54658)
+error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #55599)
   --> $DIR/feature-gate-extern_crate_item_prelude.rs:28:9
    |
 LL |     use alloc::boxed;
    |         ^^^^^
    |
    = help: add #![feature(extern_crate_item_prelude)] to the crate attributes to enable
 
-error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #54658)
+error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #55599)
   --> $DIR/feature-gate-extern_crate_item_prelude.rs:33:11
    |
 LL |     use ::alloc;
    |           ^^^^^
    |
    = help: add #![feature(extern_crate_item_prelude)] to the crate attributes to enable
 
-error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #54658)
+error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #55599)
   --> $DIR/feature-gate-extern_crate_item_prelude.rs:35:11
    |
 LL |     use ::alloc::boxed;
    |           ^^^^^
    |
    = help: add #![feature(extern_crate_item_prelude)] to the crate attributes to enable
 
-error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #54658)
+error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #55599)
   --> $DIR/feature-gate-extern_crate_item_prelude.rs:9:17
    |
 LL |         let v = alloc::vec![0];
    |                 ^^^^^
    |
    = help: add #![feature(extern_crate_item_prelude)] to the crate attributes to enable
 
-error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #54658)
+error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #55599)
   --> $DIR/feature-gate-extern_crate_item_prelude.rs:11:18
    |
 LL |         type A = alloc::boxed::Box<u8>;
    |                  ^^^^^
    |
    = help: add #![feature(extern_crate_item_prelude)] to the crate attributes to enable
 
-error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #54658)
+error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #55599)
   --> $DIR/feature-gate-extern_crate_item_prelude.rs:18:19
    |
 LL |         let v = ::alloc::vec![0];
    |                   ^^^^^
    |
    = help: add #![feature(extern_crate_item_prelude)] to the crate attributes to enable
 
-error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #54658)
+error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #55599)
   --> $DIR/feature-gate-extern_crate_item_prelude.rs:20:20
    |
 LL |         type A = ::alloc::boxed::Box<u8>;
    |                    ^^^^^
    |
    = help: add #![feature(extern_crate_item_prelude)] to the crate attributes to enable
 
-error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #54658)
+error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #55599)
   --> $DIR/feature-gate-extern_crate_item_prelude.rs:42:14
    |
 LL |     type A = core::boxed::Box<u8>;

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

@@ -1,4 +1,4 @@
-error[E0658]: `extern` in paths is experimental (see issue #44660)
+error[E0658]: `extern` in paths is experimental (see issue #55600)
   --> $DIR/feature-gate-extern_in_paths.rs:14:13
    |
 LL |     let _ = extern::std::vec::Vec::new(); //~ ERROR `extern` in paths is experimental