sprinkle feature gates here and there

src/compiletest/compiletest.rs

@@ -15,6 +15,7 @@
 #![feature(rustc_private)]
 #![feature(str_char)]
 #![feature(test)]
+#![feature(question_mark)]
 
 #![deny(warnings)]
 

src/libcore/lib.rs

@@ -77,6 +77,7 @@
 #![feature(rustc_attrs)]
 #![feature(staged_api)]
 #![feature(unboxed_closures)]
+#![feature(question_mark)]
 
 #[macro_use]
 mod macros;

src/libgraphviz/lib.rs

@@ -295,6 +295,7 @@
 #![cfg_attr(not(stage0), deny(warnings))]
 
 #![feature(str_escape)]
+#![feature(question_mark)]
 
 use self::LabelText::*;
 

src/librbml/lib.rs

@@ -125,6 +125,7 @@
 #![feature(copy_from_slice)]
 #![feature(rustc_private)]
 #![feature(staged_api)]
+#![feature(question_mark)]
 
 #![cfg_attr(test, feature(test))]
 

src/librustc/lib.rs

@@ -39,6 +39,7 @@
 #![feature(slice_patterns)]
 #![feature(staged_api)]
 #![feature(str_char)]
+#![feature(question_mark)]
 #![cfg_attr(test, feature(test))]
 
 extern crate arena;

src/librustc_back/lib.rs

@@ -38,6 +38,7 @@
 #![feature(rustc_private)]
 #![feature(staged_api)]
 #![feature(step_by)]
+#![feature(question_mark)]
 #![cfg_attr(unix, feature(static_mutex))]
 #![cfg_attr(test, feature(test, rand))]
 

src/librustc_const_eval/lib.rs

@@ -25,6 +25,7 @@
 
 #![feature(rustc_private)]
 #![feature(staged_api)]
+#![feature(question_mark)]
 
 #[macro_use] extern crate log;
 #[macro_use] extern crate syntax;

src/librustc_driver/lib.rs

@@ -30,6 +30,7 @@
 #![feature(rustc_private)]
 #![feature(set_stdio)]
 #![feature(staged_api)]
+#![feature(question_mark)]
 
 extern crate arena;
 extern crate flate;

src/librustc_front/lib.rs

@@ -33,6 +33,7 @@
 #![feature(slice_patterns)]
 #![feature(staged_api)]
 #![feature(str_char)]
+#![feature(question_mark)]
 
 extern crate serialize;
 #[macro_use]

src/librustc_metadata/lib.rs

@@ -23,6 +23,7 @@
 #![feature(rustc_diagnostic_macros)]
 #![feature(rustc_private)]
 #![feature(staged_api)]
+#![feature(question_mark)]
 
 #[macro_use] extern crate log;
 #[macro_use] extern crate syntax;

src/librustc_mir/lib.rs

@@ -23,6 +23,7 @@
 #![feature(box_patterns)]
 #![feature(rustc_private)]
 #![feature(staged_api)]
+#![feature(question_mark)]
 
 #[macro_use] extern crate log;
 extern crate graphviz as dot;

src/librustc_trans/lib.rs

@@ -36,6 +36,7 @@
 #![feature(slice_patterns)]
 #![feature(staged_api)]
 #![feature(unicode)]
+#![feature(question_mark)]
 
 extern crate arena;
 extern crate flate;

src/librustc_typeck/lib.rs

@@ -81,6 +81,7 @@
 #![feature(rustc_diagnostic_macros)]
 #![feature(rustc_private)]
 #![feature(staged_api)]
+#![feature(question_mark)]
 
 #[macro_use] extern crate log;
 #[macro_use] extern crate syntax;

src/librustdoc/lib.rs

@@ -29,6 +29,7 @@
 #![feature(std_panic)]
 #![feature(test)]
 #![feature(unicode)]
+#![feature(question_mark)]
 
 extern crate arena;
 extern crate getopts;

src/libserialize/lib.rs

@@ -34,6 +34,7 @@
 #![feature(staged_api)]
 #![feature(str_char)]
 #![feature(unicode)]
+#![feature(question_mark)]
 #![cfg_attr(test, feature(test))]
 
 // test harness access

src/libstd/lib.rs

@@ -270,6 +270,7 @@
 #![feature(unwind_attributes)]
 #![feature(vec_push_all)]
 #![feature(zero_one)]
+#![feature(question_mark)]
 
 // Issue# 30592: Systematically use alloc_system during stage0 since jemalloc
 // might be unavailable or disabled

src/libsyntax/lib.rs

@@ -32,6 +32,7 @@
 #![feature(str_char)]
 #![feature(str_escape)]
 #![feature(unicode)]
+#![feature(question_mark)]
 
 extern crate serialize;
 extern crate term;

src/libterm/lib.rs

@@ -59,6 +59,7 @@
 #![cfg_attr(windows, feature(libc))]
 // Handle rustfmt skips
 #![feature(custom_attribute)]
+#![feature(question_mark)]
 #![allow(unused_attributes)]
 
 use std::io::prelude::*;

src/libtest/lib.rs

@@ -40,6 +40,7 @@
 #![feature(rustc_private)]
 #![feature(set_stdio)]
 #![feature(staged_api)]
+#![feature(question_mark)]
 
 extern crate getopts;
 extern crate term;

src/test/run-pass/ifmt.rs

@@ -14,6 +14,7 @@
 #![allow(unused_must_use)]
 #![allow(unknown_features)]
 #![feature(box_syntax)]
+#![feature(question_mark)]
 
 use std::fmt::{self, Write};
 use std::usize;

src/test/run-pass/issue-17121.rs

@@ -10,6 +10,8 @@
 
 // pretty-expanded FIXME #23616
 
+#![feature(question_mark)]
+
 use std::fs::File;
 use std::io::{self, BufReader, Read};
 

src/test/run-pass/issue-20797.rs

@@ -12,6 +12,8 @@
 
 // pretty-expanded FIXME #23616
 
+#![feature(question_mark)]
+
 use std::default::Default;
 use std::io;
 use std::fs;

src/test/run-pass/issue-21400.rs

@@ -11,6 +11,8 @@
 // Regression test for #21400 which itself was extracted from
 // stackoverflow.com/questions/28031155/is-my-borrow-checker-drunk/28031580
 
+#![feature(question_mark)]
+
 fn main() {
     let mut t = Test;
     assert_eq!(t.method1("one"), Ok(1));

src/tools/error_index_generator/main.rs

@@ -9,6 +9,7 @@
 // except according to those terms.
 
 #![feature(rustc_private, rustdoc)]
+#![feature(question_mark)]
 
 extern crate syntax;
 extern crate rustdoc;

src/tools/rustbook/main.rs

@@ -13,6 +13,7 @@
 #![feature(iter_arith)]
 #![feature(rustc_private)]
 #![feature(rustdoc)]
+#![feature(question_mark)]
 
 extern crate rustdoc;
 extern crate rustc_back;