Rustdoc-Json: List impls for primitives

 Closes #101695

src/librustdoc/json/conversions.rs

@@ -272,7 +272,12 @@ fn from_clean_item(item: clean::Item, tcx: TyCtxt<'_>) -> ItemEnum {
         ConstantItem(c) => ItemEnum::Constant(c.into_tcx(tcx)),
         MacroItem(m) => ItemEnum::Macro(m.source),
         ProcMacroItem(m) => ItemEnum::ProcMacro(m.into_tcx(tcx)),
-        PrimitiveItem(p) => ItemEnum::PrimitiveType(p.as_sym().to_string()),
+        PrimitiveItem(p) => {
+            ItemEnum::Primitive(Primitive {
+                name: p.as_sym().to_string(),
+                impls: Vec::new(), // Added in JsonRenderer::item
+            })
+        }
         TyAssocConstItem(ty) => ItemEnum::AssocConst { type_: ty.into_tcx(tcx), default: None },
         AssocConstItem(ty, default) => {
             ItemEnum::AssocConst { type_: ty.into_tcx(tcx), default: Some(default.expr(tcx)) }

src/librustdoc/json/mod.rs

@@ -219,12 +219,15 @@ impl<'tcx> FormatRenderer<'tcx> for JsonRenderer<'tcx> {
                     u.impls = self.get_impls(item_id.expect_def_id());
                     false
                 }
+                types::ItemEnum::Primitive(ref mut p) => {
+                    p.impls = self.get_impls(item_id.expect_def_id());
+                    false
+                }
 
                 types::ItemEnum::Method(_)
                 | types::ItemEnum::Module(_)
                 | types::ItemEnum::AssocConst { .. }
-                | types::ItemEnum::AssocType { .. }
-                | types::ItemEnum::PrimitiveType(_) => true,
+                | types::ItemEnum::AssocType { .. } => true,
                 types::ItemEnum::ExternCrate { .. }
                 | types::ItemEnum::Import(_)
                 | types::ItemEnum::StructField(_)

src/rustdoc-json-types/lib.rs

@@ -9,7 +9,7 @@ use std::path::PathBuf;
 use serde::{Deserialize, Serialize};
 
 /// rustdoc format-version.
-pub const FORMAT_VERSION: u32 = 21;
+pub const FORMAT_VERSION: u32 = 22;
 
 /// A `Crate` is the root of the emitted JSON blob. It contains all type/documentation information
 /// about the language items in the local crate, as well as info about external items to allow
@@ -254,7 +254,7 @@ pub enum ItemEnum {
     Macro(String),
     ProcMacro(ProcMacro),
 
-    PrimitiveType(String),
+    Primitive(Primitive),
 
     AssocConst {
         #[serde(rename = "type")]
@@ -709,5 +709,11 @@ pub struct Static {
     pub expr: String,
 }
 
+#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
+pub struct Primitive {
+    pub name: String,
+    pub impls: Vec<Id>,
+}
+
 #[cfg(test)]
 mod tests;

src/test/rustdoc-json/primitives/primitive_impls.rs

@@ -0,0 +1,34 @@
+#![feature(no_core)]
+#![feature(rustc_attrs)]
+#![feature(rustdoc_internals)]
+#![no_core]
+#![rustc_coherence_is_core]
+
+// @set impl_i32 = "$.index[*][?(@.docs=='Only core can do this')].id"
+
+/// Only core can do this
+impl i32 {
+    // @set identity = "$.index[*][?(@.docs=='Do Nothing')].id"
+
+    /// Do Nothing
+    pub fn identity(self) -> Self {
+        self
+    }
+
+    // @is "$.index[*][?(@.docs=='Only core can do this')].inner.items[*]" $identity
+}
+
+// @set Trait = "$.index[*][?(@.name=='Trait')].id"
+pub trait Trait {}
+// @set impl_trait_for_i32 = "$.index[*][?(@.docs=='impl Trait for i32')].id"
+/// impl Trait for i32
+impl Trait for i32 {}
+
+/// i32
+#[doc(primitive = "i32")]
+mod prim_i32 {}
+
+// @set i32 = "$.index[*][?(@.docs=='i32')].id"
+// @is "$.index[*][?(@.docs=='i32')].name" '"i32"'
+// @is "$.index[*][?(@.docs=='i32')].inner.name" '"i32"'
+// @ismany "$.index[*][?(@.docs=='i32')].inner.impls[*]" $impl_i32 $impl_trait_for_i32

src/test/rustdoc-json/primitive.rs → src/test/rustdoc-json/primitives/use_primitive.rs

@@ -5,7 +5,7 @@
 #[doc(primitive = "usize")]
 mod usize {}
 
-// @set local_crate_id = "$.index[*][?(@.name=='primitive')].crate_id"
+// @set local_crate_id = "$.index[*][?(@.name=='use_primitive')].crate_id"
 
 // @has "$.index[*][?(@.name=='ilog10')]"
 // @!is "$.index[*][?(@.name=='ilog10')].crate_id" $local_crate_id

src/tools/jsondoclint/src/item_kind.rs

@@ -142,8 +142,7 @@ impl Kind {
             ItemEnum::Static(_) => Static,
             ItemEnum::Macro(_) => Macro,
             ItemEnum::ProcMacro(_) => ProcMacro,
-            // https://github.com/rust-lang/rust/issues/100961
-            ItemEnum::PrimitiveType(_) => Primitive,
+            ItemEnum::Primitive(_) => Primitive,
             ItemEnum::ForeignType => ForeignType,
             ItemEnum::ExternCrate { .. } => ExternCrate,
             ItemEnum::AssocConst { .. } => AssocConst,

src/tools/jsondoclint/src/validator.rs

@@ -4,8 +4,8 @@ use std::hash::Hash;
 use rustdoc_json_types::{
     Constant, Crate, DynTrait, Enum, FnDecl, Function, FunctionPointer, GenericArg, GenericArgs,
     GenericBound, GenericParamDef, Generics, Id, Impl, Import, ItemEnum, Method, Module, OpaqueTy,
-    Path, ProcMacro, Static, Struct, StructKind, Term, Trait, TraitAlias, Type, TypeBinding,
-    TypeBindingKind, Typedef, Union, Variant, WherePredicate,
+    Path, Primitive, ProcMacro, Static, Struct, StructKind, Term, Trait, TraitAlias, Type,
+    TypeBinding, TypeBindingKind, Typedef, Union, Variant, WherePredicate,
 };
 
 use crate::{item_kind::Kind, Error, ErrorKind};
@@ -76,7 +76,7 @@ impl<'a> Validator<'a> {
                 ItemEnum::ForeignType => {} // nop
                 ItemEnum::Macro(x) => self.check_macro(x),
                 ItemEnum::ProcMacro(x) => self.check_proc_macro(x),
-                ItemEnum::PrimitiveType(x) => self.check_primitive_type(x),
+                ItemEnum::Primitive(x) => self.check_primitive_type(x),
                 ItemEnum::Module(x) => self.check_module(x),
                 // FIXME: Why don't these have their own structs?
                 ItemEnum::ExternCrate { .. } => {}
@@ -219,8 +219,8 @@ impl<'a> Validator<'a> {
         // nop
     }
 
-    fn check_primitive_type(&mut self, _: &'a str) {
-        // nop
+    fn check_primitive_type(&mut self, x: &'a Primitive) {
+        x.impls.iter().for_each(|i| self.add_impl_id(i));
     }
 
     fn check_generics(&mut self, x: &'a Generics) {