Add `nightly` feature, use for `unlikely` intrinsic

4 files changed, 12 insertions, 3 deletions

diff --git a/src/grid.rs b/src/grid.rs
index e044a8c3..5c3da769 100644
--- a/src/grid.rs
+++ b/src/grid.rs
@@ -150,7 +150,7 @@ impl<T> Grid<T> {
     /// better error messages by doing the bounds checking ourselves.
     #[inline]
     pub fn swap_lines(&mut self, src: index::Line, dst: index::Line) {
-        use std::intrinsics::unlikely;
+        use util::unlikely;
 
         unsafe {
             // check that src/dst are in bounds. Since index::Line newtypes usize,
diff --git a/src/lib.rs b/src/lib.rs
index c6215a80..295a674c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -20,7 +20,7 @@
 #![cfg_attr(feature = "clippy", deny(if_not_else))]
 #![cfg_attr(feature = "clippy", deny(wrong_pub_self_convention))]
 #![cfg_attr(test, feature(test))]
-#![feature(core_intrinsics)]
+#![cfg_attr(feature = "nightly", feature(core_intrinsics))]
 
 #![feature(proc_macro)]
 
diff --git a/src/term/mod.rs b/src/term/mod.rs
index 09ed5d41..eab73e74 100644
--- a/src/term/mod.rs
+++ b/src/term/mod.rs
@@ -630,7 +630,7 @@ impl ansi::Handler for Term {
         }
 
         unsafe {
-            if ::std::intrinsics::unlikely(self.cursor.line == self.grid.num_lines()) {
+            if ::util::unlikely(self.cursor.line == self.grid.num_lines()) {
                 panic!("cursor fell off grid");
             }
         }
diff --git a/src/util.rs b/src/util.rs
index 44f7b3de..2e34b2a6 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -13,6 +13,15 @@
 // limitations under the License.
 use std::cmp;
 
+#[cfg(not(feature = "nightly"))]
+#[inline(always)]
+pub unsafe fn unlikely(x: bool) -> bool {
+    x
+}
+
+#[cfg(feature = "nightly")]
+pub use ::std::intrinsics::unlikely;
+
 /// Threading utilities
 pub mod thread {
     /// Like `thread::spawn`, but with a `name` argument