diff --git a/compiler/rustc_expand/src/config.rs b/compiler/rustc_expand/src/config.rs
index cccbdf778ed..563783c5b79 100644
--- a/compiler/rustc_expand/src/config.rs
+++ b/compiler/rustc_expand/src/config.rs
@@ -1,5 +1,7 @@
 //! Conditional compilation stripping.
 
+use crate::base::Annotatable;
+
 use rustc_ast::attr::HasAttrs;
 use rustc_ast::mut_visit::*;
 use rustc_ast::ptr::P;
@@ -496,6 +498,49 @@ impl<'a> StripUnconfigured<'a> {
     pub fn configure_fn_decl(&mut self, fn_decl: &mut ast::FnDecl) {
         fn_decl.inputs.flat_map_in_place(|arg| self.configure(arg));
     }
+
+    pub fn fully_configure(&mut self, item: Annotatable) -> Annotatable {
+        // Since the item itself has already been configured by the InvocationCollector,
+        // we know that fold result vector will contain exactly one element
+        match item {
+            Annotatable::Item(item) => Annotatable::Item(self.flat_map_item(item).pop().unwrap()),
+            Annotatable::TraitItem(item) => {
+                Annotatable::TraitItem(self.flat_map_trait_item(item).pop().unwrap())
+            }
+            Annotatable::ImplItem(item) => {
+                Annotatable::ImplItem(self.flat_map_impl_item(item).pop().unwrap())
+            }
+            Annotatable::ForeignItem(item) => {
+                Annotatable::ForeignItem(self.flat_map_foreign_item(item).pop().unwrap())
+            }
+            Annotatable::Stmt(stmt) => {
+                Annotatable::Stmt(stmt.map(|stmt| self.flat_map_stmt(stmt).pop().unwrap()))
+            }
+            Annotatable::Expr(mut expr) => Annotatable::Expr({
+                self.visit_expr(&mut expr);
+                expr
+            }),
+            Annotatable::Arm(arm) => Annotatable::Arm(self.flat_map_arm(arm).pop().unwrap()),
+            Annotatable::Field(field) => {
+                Annotatable::Field(self.flat_map_field(field).pop().unwrap())
+            }
+            Annotatable::FieldPat(fp) => {
+                Annotatable::FieldPat(self.flat_map_field_pattern(fp).pop().unwrap())
+            }
+            Annotatable::GenericParam(param) => {
+                Annotatable::GenericParam(self.flat_map_generic_param(param).pop().unwrap())
+            }
+            Annotatable::Param(param) => {
+                Annotatable::Param(self.flat_map_param(param).pop().unwrap())
+            }
+            Annotatable::StructField(sf) => {
+                Annotatable::StructField(self.flat_map_struct_field(sf).pop().unwrap())
+            }
+            Annotatable::Variant(v) => {
+                Annotatable::Variant(self.flat_map_variant(v).pop().unwrap())
+            }
+        }
+    }
 }
 
 impl<'a> MutVisitor for StripUnconfigured<'a> {
diff --git a/compiler/rustc_expand/src/expand.rs b/compiler/rustc_expand/src/expand.rs
index a0ecc416617..c4dcdd28817 100644
--- a/compiler/rustc_expand/src/expand.rs
+++ b/compiler/rustc_expand/src/expand.rs
@@ -609,48 +609,6 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
         (fragment, invocations)
     }
 
-    fn fully_configure(&mut self, item: Annotatable) -> Annotatable {
-        let mut cfg = StripUnconfigured { sess: &self.cx.sess, features: self.cx.ecfg.features };
-        // Since the item itself has already been configured by the InvocationCollector,
-        // we know that fold result vector will contain exactly one element
-        match item {
-            Annotatable::Item(item) => Annotatable::Item(cfg.flat_map_item(item).pop().unwrap()),
-            Annotatable::TraitItem(item) => {
-                Annotatable::TraitItem(cfg.flat_map_trait_item(item).pop().unwrap())
-            }
-            Annotatable::ImplItem(item) => {
-                Annotatable::ImplItem(cfg.flat_map_impl_item(item).pop().unwrap())
-            }
-            Annotatable::ForeignItem(item) => {
-                Annotatable::ForeignItem(cfg.flat_map_foreign_item(item).pop().unwrap())
-            }
-            Annotatable::Stmt(stmt) => {
-                Annotatable::Stmt(stmt.map(|stmt| cfg.flat_map_stmt(stmt).pop().unwrap()))
-            }
-            Annotatable::Expr(mut expr) => Annotatable::Expr({
-                cfg.visit_expr(&mut expr);
-                expr
-            }),
-            Annotatable::Arm(arm) => Annotatable::Arm(cfg.flat_map_arm(arm).pop().unwrap()),
-            Annotatable::Field(field) => {
-                Annotatable::Field(cfg.flat_map_field(field).pop().unwrap())
-            }
-            Annotatable::FieldPat(fp) => {
-                Annotatable::FieldPat(cfg.flat_map_field_pattern(fp).pop().unwrap())
-            }
-            Annotatable::GenericParam(param) => {
-                Annotatable::GenericParam(cfg.flat_map_generic_param(param).pop().unwrap())
-            }
-            Annotatable::Param(param) => {
-                Annotatable::Param(cfg.flat_map_param(param).pop().unwrap())
-            }
-            Annotatable::StructField(sf) => {
-                Annotatable::StructField(cfg.flat_map_struct_field(sf).pop().unwrap())
-            }
-            Annotatable::Variant(v) => Annotatable::Variant(cfg.flat_map_variant(v).pop().unwrap()),
-        }
-    }
-
     fn error_recursion_limit_reached(&mut self) {
         let expn_data = self.cx.current_expansion.id.expn_data();
         let suggested_limit = self.cx.ecfg.recursion_limit * 2;