Rollup merge of #138577 - aDotInTheVoid:deprecate-deprecations, r=GuillaumeGomez

rustdoc-json: Don't also include `#[deprecated]` in `Item::attrs`

Closes #138378

Not sure if this should bump `FORMAT_VERSION` or not. CC `@Enselic` `@LukeMathWalker` `@obi1kenobi`

r? `@GuillaumeGomez,` best reviewed commit-by-commit

src/librustdoc/clean/types.rs

@@ -5,7 +5,7 @@ use std::{fmt, iter};
 
 use arrayvec::ArrayVec;
 use rustc_abi::{ExternAbi, VariantIdx};
-use rustc_attr_parsing::{ConstStability, Deprecation, Stability, StableSince};
+use rustc_attr_parsing::{AttributeKind, ConstStability, Deprecation, Stability, StableSince};
 use rustc_data_structures::fx::{FxHashSet, FxIndexMap, FxIndexSet};
 use rustc_hir::def::{CtorKind, DefKind, Res};
 use rustc_hir::def_id::{CrateNum, DefId, LOCAL_CRATE, LocalDefId};
@@ -756,12 +756,7 @@ impl Item {
         Some(tcx.visibility(def_id))
     }
 
-    pub(crate) fn attributes(
-        &self,
-        tcx: TyCtxt<'_>,
-        cache: &Cache,
-        keep_as_is: bool,
-    ) -> Vec<String> {
+    pub(crate) fn attributes(&self, tcx: TyCtxt<'_>, cache: &Cache, is_json: bool) -> Vec<String> {
         const ALLOWED_ATTRIBUTES: &[Symbol] =
             &[sym::export_name, sym::link_section, sym::no_mangle, sym::non_exhaustive];
 
@@ -772,8 +767,14 @@ impl Item {
             .other_attrs
             .iter()
             .filter_map(|attr| {
-                if keep_as_is {
-                    Some(rustc_hir_pretty::attribute_to_string(&tcx, attr))
+                if is_json {
+                    if matches!(attr, hir::Attribute::Parsed(AttributeKind::Deprecation { .. })) {
+                        // rustdoc-json stores this in `Item::deprecation`, so we
+                        // don't want it it `Item::attrs`.
+                        None
+                    } else {
+                        Some(rustc_hir_pretty::attribute_to_string(&tcx, attr))
+                    }
                 } else if ALLOWED_ATTRIBUTES.contains(&attr.name_or_empty()) {
                     Some(
                         rustc_hir_pretty::attribute_to_string(&tcx, attr)
@@ -786,7 +787,9 @@ impl Item {
                 }
             })
             .collect();
-        if !keep_as_is
+
+        // Add #[repr(...)]
+        if !is_json
             && let Some(def_id) = self.def_id()
             && let ItemType::Struct | ItemType::Enum | ItemType::Union = self.type_()
         {

tests/rustdoc-json/attrs/deprecated.rs

@@ -0,0 +1,38 @@
+//@ is "$.index[*][?(@.name=='not')].attrs" []
+//@ is "$.index[*][?(@.name=='not')].deprecation" null
+pub fn not() {}
+
+//@ is "$.index[*][?(@.name=='raw')].attrs" []
+//@ is "$.index[*][?(@.name=='raw')].deprecation" '{"since": null, "note": null}'
+#[deprecated]
+pub fn raw() {}
+
+//@ is "$.index[*][?(@.name=='equals_string')].attrs" []
+//@ is "$.index[*][?(@.name=='equals_string')].deprecation" '{"since": null, "note": "here is a reason"}'
+#[deprecated = "here is a reason"]
+pub fn equals_string() {}
+
+//@ is "$.index[*][?(@.name=='since')].attrs" []
+//@ is "$.index[*][?(@.name=='since')].deprecation" '{"since": "yoinks ago", "note": null}'
+#[deprecated(since = "yoinks ago")]
+pub fn since() {}
+
+//@ is "$.index[*][?(@.name=='note')].attrs" []
+//@ is "$.index[*][?(@.name=='note')].deprecation" '{"since": null, "note": "7"}'
+#[deprecated(note = "7")]
+pub fn note() {}
+
+//@ is "$.index[*][?(@.name=='since_and_note')].attrs" []
+//@ is "$.index[*][?(@.name=='since_and_note')].deprecation" '{"since": "tomorrow", "note": "sorry"}'
+#[deprecated(since = "tomorrow", note = "sorry")]
+pub fn since_and_note() {}
+
+//@ is "$.index[*][?(@.name=='note_and_since')].attrs" []
+//@ is "$.index[*][?(@.name=='note_and_since')].deprecation" '{"since": "a year from tomorrow", "note": "your welcome"}'
+#[deprecated(note = "your welcome", since = "a year from tomorrow")]
+pub fn note_and_since() {}
+
+//@ is "$.index[*][?(@.name=='neither_but_parens')].attrs" []
+//@ is "$.index[*][?(@.name=='neither_but_parens')].deprecation" '{"since": null, "note": null}'
+#[deprecated()]
+pub fn neither_but_parens() {}