Revert "Rollup merge of #82296 - spastorino:pubrules, r=nikomatsakis"

compiler/rustc_ast_passes/src/feature_gate.rs

@@ -691,7 +691,6 @@ pub fn check_crate(krate: &ast::Crate, sess: &Session) {
         // involved, so we only emit errors where there are no other parsing errors.
         gate_all!(destructuring_assignment, "destructuring assignments are unstable");
     }
-    gate_all!(pub_macro_rules, "`pub` on `macro_rules` items is unstable");
 
     // All uses of `gate_all!` below this point were added in #65742,
     // and subsequently disabled (with the non-early gating readded).

compiler/rustc_feature/src/active.rs

@@ -624,9 +624,6 @@ declare_features! (
     /// Allows macro attributes to observe output of `#[derive]`.
     (active, macro_attributes_in_derive_output, "1.51.0", Some(81119), None),
 
-    /// Allows `pub` on `macro_rules` items.
-    (active, pub_macro_rules, "1.52.0", Some(78855), None),
-
     /// Allows the use of type alias impl trait in function return positions
     (active, min_type_alias_impl_trait, "1.52.0", Some(63063), None),
 

compiler/rustc_feature/src/removed.rs

@@ -134,6 +134,8 @@ declare_features! (
            which is available from cargo build scripts with `cargo:rustc-link-arg` now")),
     /// Allows using `#[main]` to replace the entrypoint `#[lang = "start"]` calls.
     (removed, main, "1.53.0", Some(29634), None, None),
+    (removed, pub_macro_rules, "1.53.0", Some(78855), None,
+     Some("removed due to being incomplete, in particular it does not work across crates")),
 
     // -------------------------------------------------------------------------
     // feature-group-end: removed features

compiler/rustc_parse/src/parser/item.rs

@@ -1478,7 +1478,15 @@ impl<'a> Parser<'a> {
         let vstr = pprust::vis_to_string(vis);
         let vstr = vstr.trim_end();
         if macro_rules {
-            self.sess.gated_spans.gate(sym::pub_macro_rules, vis.span);
+            let msg = format!("can't qualify macro_rules invocation with `{}`", vstr);
+            self.struct_span_err(vis.span, &msg)
+                .span_suggestion(
+                    vis.span,
+                    "try exporting the macro",
+                    "#[macro_export]".to_owned(),
+                    Applicability::MaybeIncorrect, // speculative
+                )
+                .emit();
         } else {
             self.struct_span_err(vis.span, "can't qualify macro invocation with `pub`")
                 .span_suggestion(

compiler/rustc_resolve/src/build_reduced_graph.rs

@@ -1230,13 +1230,13 @@ impl<'a, 'b> BuildReducedGraphVisitor<'a, 'b> {
         };
 
         let res = Res::Def(DefKind::Macro(ext.macro_kind()), def_id.to_def_id());
-        let is_macro_export = self.r.session.contains_name(&item.attrs, sym::macro_export);
         self.r.macro_map.insert(def_id.to_def_id(), ext);
         self.r.local_macro_def_scopes.insert(def_id, parent_scope.module);
 
-        if macro_rules && matches!(item.vis.kind, ast::VisibilityKind::Inherited) {
+        if macro_rules {
             let ident = ident.normalize_to_macros_2_0();
             self.r.macro_names.insert(ident);
+            let is_macro_export = self.r.session.contains_name(&item.attrs, sym::macro_export);
             let vis = if is_macro_export {
                 ty::Visibility::Public
             } else {
@@ -1261,11 +1261,6 @@ impl<'a, 'b> BuildReducedGraphVisitor<'a, 'b> {
                 }),
             ))
         } else {
-            if is_macro_export {
-                let what = if macro_rules { "`macro_rules` with `pub`" } else { "`macro` items" };
-                let msg = format!("`#[macro_export]` cannot be used on {what}");
-                self.r.session.span_err(item.span, &msg);
-            }
             let module = parent_scope.module;
             let vis = match item.kind {
                 // Visibilities must not be resolved non-speculatively twice

src/test/ui/did_you_mean/pub-macro-rules.rs

@@ -0,0 +1,16 @@
+#[macro_use] mod bleh {
+    pub macro_rules! foo { //~ ERROR can't qualify macro_rules invocation
+        ($n:ident) => (
+            fn $n () -> i32 {
+                1
+            }
+        )
+    }
+
+}
+
+foo!(meh);
+
+fn main() {
+    println!("{}", meh());
+}

src/test/ui/did_you_mean/pub-macro-rules.stderr

@@ -0,0 +1,8 @@
+error: can't qualify macro_rules invocation with `pub`
+  --> $DIR/pub-macro-rules.rs:2:5
+   |
+LL |     pub macro_rules! foo {
+   |     ^^^ help: try exporting the macro: `#[macro_export]`
+
+error: aborting due to previous error
+