sprinkle feature gates here and there

25 files changed, 28 insertions, 0 deletions

diff --git a/src/compiletest/compiletest.rs b/src/compiletest/compiletest.rs
index 4c845efdf34..d98055edf85 100644
--- a/src/compiletest/compiletest.rs
+++ b/src/compiletest/compiletest.rs
@@ -15,6 +15,7 @@
 #![feature(rustc_private)]
 #![feature(str_char)]
 #![feature(test)]
+#![feature(question_mark)]
 
 #![deny(warnings)]
 
diff --git a/src/libcore/lib.rs b/src/libcore/lib.rs
index f199909dfa9..648b652772a 100644
--- a/src/libcore/lib.rs
+++ b/src/libcore/lib.rs
@@ -77,6 +77,7 @@
 #![feature(rustc_attrs)]
 #![feature(staged_api)]
 #![feature(unboxed_closures)]
+#![feature(question_mark)]
 
 #[macro_use]
 mod macros;
diff --git a/src/libgraphviz/lib.rs b/src/libgraphviz/lib.rs
index d4d3ac93c97..74cc498a7df 100644
--- a/src/libgraphviz/lib.rs
+++ b/src/libgraphviz/lib.rs
@@ -295,6 +295,7 @@
 #![cfg_attr(not(stage0), deny(warnings))]
 
 #![feature(str_escape)]
+#![feature(question_mark)]
 
 use self::LabelText::*;
 
diff --git a/src/librbml/lib.rs b/src/librbml/lib.rs
index a02c02cc030..34726a7a6c8 100644
--- a/src/librbml/lib.rs
+++ b/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))]
 
diff --git a/src/librustc/lib.rs b/src/librustc/lib.rs
index d2ca1cd3f93..d8d0079b3e3 100644
--- a/src/librustc/lib.rs
+++ b/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;
diff --git a/src/librustc_back/lib.rs b/src/librustc_back/lib.rs
index 3ffc031d621..d854b9ed697 100644
--- a/src/librustc_back/lib.rs
+++ b/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))]
 
diff --git a/src/librustc_const_eval/lib.rs b/src/librustc_const_eval/lib.rs
index e4c702f643b..80b8c75104a 100644
--- a/src/librustc_const_eval/lib.rs
+++ b/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;
diff --git a/src/librustc_driver/lib.rs b/src/librustc_driver/lib.rs
index 0fb192bb4db..dc30b4f91a9 100644
--- a/src/librustc_driver/lib.rs
+++ b/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;
diff --git a/src/librustc_front/lib.rs b/src/librustc_front/lib.rs
index 02ad69e8a7c..b9e3b71cf1a 100644
--- a/src/librustc_front/lib.rs
+++ b/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]
diff --git a/src/librustc_metadata/lib.rs b/src/librustc_metadata/lib.rs
index f0f0fb84754..a6c612f5397 100644
--- a/src/librustc_metadata/lib.rs
+++ b/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;
diff --git a/src/librustc_mir/lib.rs b/src/librustc_mir/lib.rs
index 7c8c8945bbc..67bac196f48 100644
--- a/src/librustc_mir/lib.rs
+++ b/src/librustc_mir/lib.rs
@@ -23,6 +23,7 @@ Rust MIR: a lowered representation of Rust. Also: an experiment!
 #![feature(box_patterns)]
 #![feature(rustc_private)]
 #![feature(staged_api)]
+#![feature(question_mark)]
 
 #[macro_use] extern crate log;
 extern crate graphviz as dot;
diff --git a/src/librustc_trans/lib.rs b/src/librustc_trans/lib.rs
index c8ce09b4d79..f8bbde60109 100644
--- a/src/librustc_trans/lib.rs
+++ b/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;
diff --git a/src/librustc_typeck/lib.rs b/src/librustc_typeck/lib.rs
index ac760cc9056..07e5ad6fb44 100644
--- a/src/librustc_typeck/lib.rs
+++ b/src/librustc_typeck/lib.rs
@@ -81,6 +81,7 @@ This API is completely unstable and subject to change.
 #![feature(rustc_diagnostic_macros)]
 #![feature(rustc_private)]
 #![feature(staged_api)]
+#![feature(question_mark)]
 
 #[macro_use] extern crate log;
 #[macro_use] extern crate syntax;
diff --git a/src/librustdoc/lib.rs b/src/librustdoc/lib.rs
index 9dec4eb32d7..cde472a3b20 100644
--- a/src/librustdoc/lib.rs
+++ b/src/librustdoc/lib.rs
@@ -29,6 +29,7 @@
 #![feature(std_panic)]
 #![feature(test)]
 #![feature(unicode)]
+#![feature(question_mark)]
 
 extern crate arena;
 extern crate getopts;
diff --git a/src/libserialize/lib.rs b/src/libserialize/lib.rs
index d683769af7b..173ecca648c 100644
--- a/src/libserialize/lib.rs
+++ b/src/libserialize/lib.rs
@@ -34,6 +34,7 @@ Core encoding and decoding interfaces.
 #![feature(staged_api)]
 #![feature(str_char)]
 #![feature(unicode)]
+#![feature(question_mark)]
 #![cfg_attr(test, feature(test))]
 
 // test harness access
diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index 85e48f85d3d..5608bb646a4 100644
--- a/src/libstd/lib.rs
+++ b/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
diff --git a/src/libsyntax/lib.rs b/src/libsyntax/lib.rs
index 04a3cf096ba..7f8472f8b28 100644
--- a/src/libsyntax/lib.rs
+++ b/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;
diff --git a/src/libterm/lib.rs b/src/libterm/lib.rs
index 01daa938142..0244e265796 100644
--- a/src/libterm/lib.rs
+++ b/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::*;
diff --git a/src/libtest/lib.rs b/src/libtest/lib.rs
index e637246a157..e4d7697a71b 100644
--- a/src/libtest/lib.rs
+++ b/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;
diff --git a/src/test/run-pass/ifmt.rs b/src/test/run-pass/ifmt.rs
index 71fe4d6ece6..267b162a1d2 100644
--- a/src/test/run-pass/ifmt.rs
+++ b/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;
diff --git a/src/test/run-pass/issue-17121.rs b/src/test/run-pass/issue-17121.rs
index dcbcc2d44b5..b3c80041ef8 100644
--- a/src/test/run-pass/issue-17121.rs
+++ b/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};
 
diff --git a/src/test/run-pass/issue-20797.rs b/src/test/run-pass/issue-20797.rs
index d4c5dfb7463..321ed1a3bb2 100644
--- a/src/test/run-pass/issue-20797.rs
+++ b/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;
diff --git a/src/test/run-pass/issue-21400.rs b/src/test/run-pass/issue-21400.rs
index 6715b71a5f5..0d1be964748 100644
--- a/src/test/run-pass/issue-21400.rs
+++ b/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));
diff --git a/src/tools/error_index_generator/main.rs b/src/tools/error_index_generator/main.rs
index 7f80c17b756..fd7441d85ce 100644
--- a/src/tools/error_index_generator/main.rs
+++ b/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;
diff --git a/src/tools/rustbook/main.rs b/src/tools/rustbook/main.rs
index bd4fc899293..5ad4982e8af 100644
--- a/src/tools/rustbook/main.rs
+++ b/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;