Remove rustc_deprecated diagnostics

Author: jhpratt

compiler/rustc_ast_passes/src/feature_gate.rs

@@ -406,8 +406,7 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
 
         // Emit errors for non-staged-api crates.
         if !self.features.staged_api {
-            if attr.has_name(sym::rustc_deprecated)
-                || attr.has_name(sym::unstable)
+            if attr.has_name(sym::unstable)
                 || attr.has_name(sym::stable)
                 || attr.has_name(sym::rustc_const_unstable)
                 || attr.has_name(sym::rustc_const_stable)

compiler/rustc_attr/src/builtin.rs

@@ -720,18 +720,10 @@ where
     let is_rustc = sess.features_untracked().staged_api;
 
     'outer: for attr in attrs_iter {
-        if !(attr.has_name(sym::deprecated) || attr.has_name(sym::rustc_deprecated)) {
+        if !attr.has_name(sym::deprecated) {
             continue;
         }
 
-        // FIXME(jhpratt) remove this eventually
-        if attr.has_name(sym::rustc_deprecated) {
-            diagnostic
-                .struct_span_err(attr.span, "`#[rustc_deprecated]` has been removed")
-                .help("use `#[deprecated]` instead")
-                .emit();
-        }
-
         let Some(meta) = attr.meta() else {
             continue;
         };
@@ -787,25 +779,6 @@ where
                                     continue 'outer;
                                 }
                             }
-                            // FIXME(jhpratt) remove this eventually
-                            sym::reason if attr.has_name(sym::rustc_deprecated) => {
-                                if !get(mi, &mut note) {
-                                    continue 'outer;
-                                }
-
-                                let mut diag = diagnostic
-                                    .struct_span_err(mi.span, "`reason` has been renamed");
-                                match note {
-                                    Some(note) => diag.span_suggestion(
-                                        mi.span,
-                                        "use `note` instead",
-                                        format!("note = \"{note}\""),
-                                        Applicability::MachineApplicable,
-                                    ),
-                                    None => diag.span_help(mi.span, "use `note` instead"),
-                                };
-                                diag.emit();
-                            }
                             sym::suggestion => {
                                 if !sess.features_untracked().deprecated_suggestion {
                                     let mut diag = sess.struct_span_err(

compiler/rustc_feature/src/builtin_attrs.rs

@@ -489,11 +489,6 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
     // ==========================================================================
 
     ungated!(feature, CrateLevel, template!(List: "name1, name2, ..."), DuplicatesOk),
-    // FIXME(jhpratt) remove this eventually
-    ungated!(
-        rustc_deprecated, Normal,
-        template!(List: r#"since = "version", note = "...""#), ErrorFollowing
-    ),
     // DuplicatesOk since it has its own validation
     ungated!(
         stable, Normal, template!(List: r#"feature = "name", since = "version""#), DuplicatesOk,

compiler/rustc_passes/src/check_attr.rs

@@ -152,9 +152,7 @@ impl CheckAttrVisitor<'_> {
                 sym::link_name => self.check_link_name(hir_id, attr, span, target),
                 sym::link_section => self.check_link_section(hir_id, attr, span, target),
                 sym::no_mangle => self.check_no_mangle(hir_id, attr, span, target),
-                sym::deprecated | sym::rustc_deprecated => {
-                    self.check_deprecated(hir_id, attr, span, target)
-                }
+                sym::deprecated => self.check_deprecated(hir_id, attr, span, target),
                 sym::macro_use | sym::macro_escape => self.check_macro_use(hir_id, attr, target),
                 sym::path => self.check_generic_attr(hir_id, attr, target, &[Target::Mod]),
                 sym::plugin_registrar => self.check_plugin_registrar(hir_id, attr, target),

compiler/rustc_span/src/symbol.rs

@@ -1188,7 +1188,6 @@ symbols! {
         rustc_const_unstable,
         rustc_conversion_suggestion,
         rustc_def_path,
-        rustc_deprecated,
         rustc_diagnostic_item,
         rustc_diagnostic_macros,
         rustc_dirty,

src/test/ui/deprecation/rustc_deprecated.rs

@@ -69,7 +69,6 @@
 #![link_section = "1800"]
 //~^ WARN attribute should be applied to a function or static
 //~^^ WARN this was previously accepted by the compiler
-// see issue-43106-gating-of-rustc_deprecated.rs
 #![must_use]
 //~^ WARN `#[must_use]` has no effect
 // see issue-43106-gating-of-stable.rs