Implment `#[cfg]` and `#[cfg_attr]` in `where` clauses

2 files changed, 20 insertions, 10 deletions

diff --git a/compiler/rustc_builtin_macros/src/deriving/coerce_pointee.rs b/compiler/rustc_builtin_macros/src/deriving/coerce_pointee.rs
index 5aed9f76f14..46b79e09780 100644
--- a/compiler/rustc_builtin_macros/src/deriving/coerce_pointee.rs
+++ b/compiler/rustc_builtin_macros/src/deriving/coerce_pointee.rs
@@ -300,13 +300,16 @@ pub(crate) fn expand_deriving_coerce_pointee(
                 to_ty: &s_ty,
                 rewritten: false,
             };
-            let mut predicate = ast::WherePredicate {
-                kind: ast::WherePredicateKind::BoundPredicate(bound.clone()),
-                span: predicate.span,
-                id: ast::DUMMY_NODE_ID,
-            };
-            substitution.visit_where_predicate(&mut predicate);
+            let mut kind = ast::WherePredicateKind::BoundPredicate(bound.clone());
+            substitution.visit_where_predicate_kind(&mut kind);
             if substitution.rewritten {
+                let predicate = ast::WherePredicate {
+                    attrs: predicate.attrs.clone(),
+                    kind,
+                    span: predicate.span,
+                    id: ast::DUMMY_NODE_ID,
+                    is_placeholder: false,
+                };
                 impl_generics.where_clause.predicates.push(predicate);
             }
         }
@@ -388,8 +391,8 @@ impl<'a> ast::mut_visit::MutVisitor for TypeSubstitution<'a> {
         }
     }
 
-    fn visit_where_predicate(&mut self, where_predicate: &mut ast::WherePredicate) {
-        match &mut where_predicate.kind {
+    fn visit_where_predicate_kind(&mut self, kind: &mut ast::WherePredicateKind) {
+        match kind {
             rustc_ast::WherePredicateKind::BoundPredicate(bound) => {
                 bound
                     .bound_generic_params
diff --git a/compiler/rustc_builtin_macros/src/deriving/generic/mod.rs b/compiler/rustc_builtin_macros/src/deriving/generic/mod.rs
index 6b59ac25827..5402b5a1ae9 100644
--- a/compiler/rustc_builtin_macros/src/deriving/generic/mod.rs
+++ b/compiler/rustc_builtin_macros/src/deriving/generic/mod.rs
@@ -687,9 +687,11 @@ impl<'a> TraitDef<'a> {
         // and similarly for where clauses
         where_clause.predicates.extend(generics.where_clause.predicates.iter().map(|clause| {
             ast::WherePredicate {
+                attrs: clause.attrs.clone(),
                 kind: clause.kind.clone(),
                 id: ast::DUMMY_NODE_ID,
                 span: clause.span.with_ctxt(ctxt),
+                is_placeholder: false,
             }
         }));
 
@@ -744,8 +746,13 @@ impl<'a> TraitDef<'a> {
                         };
 
                         let kind = ast::WherePredicateKind::BoundPredicate(predicate);
-                        let predicate =
-                            ast::WherePredicate { kind, id: ast::DUMMY_NODE_ID, span: self.span };
+                        let predicate = ast::WherePredicate {
+                            attrs: ThinVec::new(),
+                            kind,
+                            id: ast::DUMMY_NODE_ID,
+                            span: self.span,
+                            is_placeholder: false,
+                        };
                         where_clause.predicates.push(predicate);
                     }
                 }