Avoid re-export errors in the generated test harness

src/librustc_resolve/resolve_imports.rs

@@ -683,9 +683,8 @@ impl<'a, 'b:'a> ImportResolver<'a, 'b> {
         };
 
         match (value_result, type_result) {
-            // With `#![feature(item_like_imports)]`, all namespaces
-            // must be re-exported with extra visibility for an error to occur.
-            (Ok(value_binding), Ok(type_binding)) if self.new_import_semantics => {
+            // All namespaces must be re-exported with extra visibility for an error to occur.
+            (Ok(value_binding), Ok(type_binding)) => {
                 let vis = directive.vis.get();
                 if !value_binding.pseudo_vis().is_at_least(vis, self) &&
                    !type_binding.pseudo_vis().is_at_least(vis, self) {

src/libsyntax/test.rs

@@ -19,7 +19,7 @@ use std::iter;
 use std::slice;
 use std::mem;
 use std::vec;
-use attr;
+use attr::{self, HasAttrs};
 use syntax_pos::{self, DUMMY_SP, NO_EXPANSION, Span, FileMap, BytePos};
 use std::rc::Rc;
 
@@ -243,12 +243,20 @@ fn mk_reexport_mod(cx: &mut TestCtxt, tests: Vec<ast::Ident>,
                    tested_submods: Vec<(ast::Ident, ast::Ident)>) -> (P<ast::Item>, ast::Ident) {
     let super_ = token::str_to_ident("super");
 
+    // Generate imports with `#[allow(private_in_public)]` to work around issue #36768.
+    let allow_private_in_public = cx.ext_cx.attribute(DUMMY_SP, cx.ext_cx.meta_list(
+        DUMMY_SP,
+        InternedString::new("allow"),
+        vec![cx.ext_cx.meta_list_item_word(DUMMY_SP, InternedString::new("private_in_public"))],
+    ));
     let items = tests.into_iter().map(|r| {
         cx.ext_cx.item_use_simple(DUMMY_SP, ast::Visibility::Public,
                                   cx.ext_cx.path(DUMMY_SP, vec![super_, r]))
+            .map_attrs(|_| vec![allow_private_in_public.clone()])
     }).chain(tested_submods.into_iter().map(|(r, sym)| {
         let path = cx.ext_cx.path(DUMMY_SP, vec![super_, r, sym]);
         cx.ext_cx.item_use_simple_(DUMMY_SP, ast::Visibility::Public, r, path)
+            .map_attrs(|_| vec![allow_private_in_public.clone()])
     })).collect();
 
     let reexport_mod = ast::Mod {

src/test/run-pass/issue-36768.rs

@@ -0,0 +1,18 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// compile-flags:--test
+#![deny(private_in_public)]
+
+#[test] fn foo() {}
+mod foo {}
+
+#[test] fn core() {}
+extern crate core;