syntax: Add #[allow(unstable)] to --test expansion

This will temporarily prevent warnings generated from expanding to code that the
test harness itself uses. This solution will require tweaking around the beta
cycle, but it will prevent spurious warnings for now.

Closes #20823

diff --git a/src/libsyntax/test.rs b/src/libsyntax/test.rs
index bacfa0bbfce4f65d163955fab958a27fffa7dc8d..895268f96c8a8b3c666711b587277b97dd3d3f81 100644 (file)
--- a/src/libsyntax/test.rs
+++ b/src/libsyntax/test.rs
@@ -439,13 +439,19 @@ pub fn main() {
     let item_ = ast::ItemMod(testmod);
 
     let mod_ident = token::gensym_ident("__test");
+    let allow_unstable = {
+        let unstable = P(nospan(ast::MetaWord(InternedString::new("unstable"))));
+        let allow = P(nospan(ast::MetaList(InternedString::new("allow"),
+                                           vec![unstable])));
+        attr::mk_attr_inner(attr::mk_attr_id(), allow)
+    };
     let item = ast::Item {
         ident: mod_ident,
-        attrs: Vec::new(),
         id: ast::DUMMY_NODE_ID,
         node: item_,
         vis: ast::Public,
         span: DUMMY_SP,
+        attrs: vec![allow_unstable],
     };
     let reexport = cx.reexport_test_harness_main.as_ref().map(|s| {
         // building `use <ident> = __test::main`

diff --git a/src/test/run-pass/issue-20823.rs b/src/test/run-pass/issue-20823.rs
new file mode 100644 (file)
index 0000000..73b7fc2
--- /dev/null
+++ b/src/test/run-pass/issue-20823.rs
@@ -0,0 +1,16 @@
+// Copyright 2015 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(unstable)]
+
+#[test]
+fn foo() {}