allow registry items to have no body

Author: jdonszelmann

compiler/rustc_ast_passes/src/ast_validation.rs

@@ -1084,23 +1084,30 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
                     _ => visit::walk_item(self, item),
                 }
             }
-            ItemKind::Const(box ConstItem { defaultness, expr, .. }) => {
+            ItemKind::Const(box ConstItem { defaultness, expr, distributed_slice, .. }) => {
                 self.check_defaultness(item.span, *defaultness);
-                if expr.is_none() {
+
+                // declarations of global registries have no body deliberately - items are added
+                // later using global registry additions
+                if expr.is_none() && !matches!(distributed_slice, DistributedSlice::Declaration(_))
+                {
                     self.dcx().emit_err(errors::ConstWithoutBody {
                         span: item.span,
                         replace_span: self.ending_semi_or_hi(item.span),
                     });
                 }
                 visit::walk_item(self, item);
             }
-            ItemKind::Static(box StaticItem { expr, safety, .. }) => {
+            ItemKind::Static(box StaticItem { expr, safety, distributed_slice, .. }) => {
                 self.check_item_safety(item.span, *safety);
                 if matches!(safety, Safety::Unsafe(_)) {
                     self.dcx().emit_err(errors::UnsafeStatic { span: item.span });
                 }
 
-                if expr.is_none() {
+                // declarations of global registries have no body deliberately - items are added
+                // later using global registry additions
+                if expr.is_none() && !matches!(distributed_slice, DistributedSlice::Declaration(_))
+                {
                     self.dcx().emit_err(errors::StaticWithoutBody {
                         span: item.span,
                         replace_span: self.ending_semi_or_hi(item.span),