Expand legacy-scoped macro during collection

Author: jonas-schievink

crates/hir_def/src/nameres/collector.rs

@@ -1467,12 +1467,13 @@ impl ModCollector<'_, '_> {
             },
         ) {
             Ok(Ok(macro_call_id)) => {
-                self.def_collector.unexpanded_macros.push(MacroDirective {
-                    module_id: self.module_id,
-                    ast_id,
-                    legacy: Some(macro_call_id),
-                    depth: self.macro_depth + 1,
-                });
+                // Legacy macros need to be expanded immediately, so that any macros they produce
+                // are in scope.
+                self.def_collector.collect_macro_expansion(
+                    self.module_id,
+                    macro_call_id,
+                    self.macro_depth + 1,
+                );
 
                 return;
             }

crates/hir_def/src/nameres/tests/macros.rs

@@ -712,6 +712,27 @@ b! { static = #[] ();}
     );
 }
 
+#[test]
+fn macros_defining_macros() {
+    check(
+        r#"
+macro_rules! item {
+    ($item:item) => { $item }
+}
+
+item! {
+    macro_rules! indirect_macro { () => { struct S {} } }
+}
+
+indirect_macro!();
+    "#,
+        expect![[r#"
+            crate
+            S: t
+        "#]],
+    );
+}
+
 #[test]
 fn resolves_proc_macros() {
     check(